NCSC-2026-0450

Vulnerability from csaf_ncscnl - Published: 2026-10-22 12:06 - Updated: 2026-10-22 12:06
Summary
Kwetsbaarheden verholpen in Snort 3 van Cisco
Notes
The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this page to enhance access to its information and security advisories. The use of this security advisory is subject to the following terms and conditions: NCSC-NL makes every reasonable effort to ensure that the content of this page is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or continuous keeping up-to-date. The information contained in this security advisory is intended solely for the purpose of providing general information to professional users. No rights can be derived from the information provided therein. NCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of this security advisory. This includes damage resulting from the inaccuracy of incompleteness of the information contained in the advisory. This security advisory is subject to Dutch law. All disputes related to or arising from the use of this advisory will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings.
Feiten: Cisco heeft meerdere kwetsbaarheden verholpen in Snort 3, het open source intrusion detection en prevention systeem dat in diverse Cisco-producten wordt gebruikt.
Interpretaties: De kwetsbaarheden bevinden zich in verschillende componenten van de Snort 3 Detection Engine, waaronder de SMTP MIME Decoder, NetFlow Detection Engine, GRE Detection Engine, Teredo Detection Engine, VBA Decompression Engine, en de memory management. Ongeauthenticeerde remote aanvallers kunnen speciaal vervaardigde pakketten of datagrammen versturen die leiden tot onverwachte herstarts van de detectie-engine, wat resulteert in een denial of service. Daarnaast is er een kwetsbaarheid in de control channel socket die een geauthenticeerde lokale aanvaller met lage privileges in staat stelt om arbitrary commands uit te voeren en toegang te krijgen tot het geheugen van het Snort 3 proces. De kwetsbaarheden beïnvloeden de stabiliteit, betrouwbaarheid en continuïteit van netwerkverkeersinspectie en dreigingsdetectie binnen de getroffen Cisco-producten.
Oplossingen: Cisco heeft updates en software hardening releases uitgebracht om deze kwetsbaarheden in Snort 3 te verhelpen. Zie bijgevoegde referenties voor meer informatie.
Kans: medium
Schade: high
CWE-121: Stack-based Buffer Overflow
CWE-128: Wrap-around Error
CWE-306: Missing Authentication for Critical Function
CWE-401: Missing Release of Memory after Effective Lifetime
CWE-476: NULL Pointer Dereference
CWE-787: Out-of-bounds Write
CWE-805: Buffer Access with Incorrect Length Value
CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')
CVE-2026-20011

A vulnerability in the Snort 3 SMTP MIME Decoder in multiple Cisco products allows an unauthenticated remote attacker to cause the Snort 3 Detection Engine to restart due to insufficient error checking in MIME field parsing, resulting in denial of service.

5.8 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
CWE-805 - Buffer Access with Incorrect Length Value
Affected products
Product Identifier Version Remediation
vers:unknown/*
Cisco / Cisco Cyber Vision
 vers:unknown/*
vers:unknown/*
Cisco / Cisco Firepower 1000 Series
 vers:unknown/*
vers:unknown/*
Cisco / Cisco Firepower 2100 Series
 vers:unknown/*
vers:unknown/*
Cisco / Cisco Open Source Snort3
 vers:unknown/*
vers:unknown/*
Cisco / Cisco Secure Firewall 4200 Series
 vers:unknown/*
vers:unknown/*
Cisco / Cisco Secure Firewall Threat Defense (FTD) Software
 vers:unknown/*
vers:unknown/*
Cisco / Cisco UTD SNORT IPS Engine Software
 vers:unknown/*
vers:unknown/*
Cisco / Cisco Umbrella Insights Virtual Appliance
 vers:unknown/*
vers:unknown/*
Cisco / Cyber Vision
 vers:unknown/*
CVE-2026-20019

A vulnerability in the Snort 3 NetFlow Detection Engine across multiple Cisco products allows unauthenticated remote attackers to send crafted NetFlow packets that cause engine restarts, resulting in denial of service.

5.8 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Affected products
Known affected 9 products, the same list as for CVE-2026-20011
CVE-2026-20043

Cisco's Open Source Snort 3 Software engineering team conducted an internal security review that identified and fixed multiple vulnerabilities, including an out-of-bounds write (CVE-2026-20043), resulting in software hardening releases.

9.0 (Critical)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
CWE-787 - Out-of-bounds Write
Affected products
Known affected 9 products, the same list as for CVE-2026-20011
CVE-2026-20179

Multiple vulnerabilities in the Snort 3 GRE Detection Engine across various Cisco products allow unauthenticated remote attackers to send crafted GRE packets that cause the detection engine to restart, resulting in denial of service.

5.8 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
CWE-128 - Wrap-around Error
Affected products
Known affected 9 products, the same list as for CVE-2026-20011
CVE-2026-20197

Multiple Cisco products are affected by a vulnerability in the Snort 3 Teredo Detection Engine that allows unauthenticated remote attackers to send crafted packets causing unexpected engine restarts and denial of service.

5.8 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
CWE-128 - Wrap-around Error
Affected products
Known affected 9 products, the same list as for CVE-2026-20011
CVE-2026-20218

A vulnerability in the Snort 3 VBA Decompression Engine of multiple Cisco products allows an unauthenticated remote attacker to cause the Snort 3 Detection Engine to restart unexpectedly, resulting in a denial of service due to improper range checking during VBA data decompression.

5.8 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
CWE-121 - Stack-based Buffer Overflow
Affected products
Known affected 9 products, the same list as for CVE-2026-20011
CVE-2026-20221

A vulnerability in Cisco's Snort 3 Detection Engine GRE tunnel decapsulation feature allows unauthenticated remote attackers to cause unexpected engine restarts, potentially leading to denial of service or bypass conditions.

5.8 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
CWE-476 - NULL Pointer Dereference
Affected products
Known affected 9 products, the same list as for CVE-2026-20011
CVE-2026-20236

Cisco's Open Source Snort 3 team conducted an internal security review resulting in software hardening releases that fix multiple vulnerabilities, including those related to incorrect calculations classified under CWE-682 and tracked by CVE-2026-20236.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-787 - Out-of-bounds Write
Affected products
Known affected 9 products, the same list as for CVE-2026-20011
CVE-2026-20291

Cisco's Open Source Snort 3 team conducted an internal security review that identified and resolved multiple issues, including privilege management vulnerabilities tracked as CVE-2026-20291 (CWE-269), resulting in software hardening releases.

7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-787 - Out-of-bounds Write
Affected products
Known affected 9 products, the same list as for CVE-2026-20011
CVE-2026-20356

Cisco's Open Source Snort 3 engineering team conducted an internal security review resulting in software hardening releases that address multiple vulnerabilities, including uncontrolled resource consumption (CVE-2026-20356, CWE-400).

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-787 - Out-of-bounds Write
Affected products
Known affected 9 products, the same list as for CVE-2026-20011
CVE-2026-76445

A vulnerability in the Snort 3 Detection Engine of multiple Cisco products allows an unauthenticated remote attacker to cause denial of service by sending crafted fragmented UDP datagrams with GPRS Tunneling Protocol extension headers, triggering an infinite loop and engine restart.

5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Affected products
Known affected 9 products, the same list as for CVE-2026-20011
CVE-2026-76489

A vulnerability in the Snort 3 Detection Engine across multiple Cisco products allows unauthenticated remote attackers to cause engine restarts, resulting in denial of service due to improper memory management and error handling.

5.8 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
CWE-401 - Missing Release of Memory after Effective Lifetime
Affected products
Known affected 9 products, the same list as for CVE-2026-20011
CVE-2026-76524

A vulnerability in the control channel socket of Open Source Snort 3 allows an authenticated local attacker with low privileges to execute arbitrary commands and access process memory due to missing authentication.

7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-306 - Missing Authentication for Critical Function
Affected products
Known affected 9 products, the same list as for CVE-2026-20011
References
To clipboard 

{
  "document": {
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE"
      }
    },
    "lang": "nl",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this page to enhance access to its information and security advisories. The use of this security advisory is subject to the following terms and conditions:\n\n    NCSC-NL makes every reasonable effort to ensure that the content of this page is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or continuous keeping up-to-date. The information contained in this security advisory is intended solely for the purpose of providing general information to professional users. No rights can be derived from the information provided therein.\n\n    NCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of this security advisory. This includes damage resulting from the inaccuracy of incompleteness of the information contained in the advisory.\n    This security advisory is subject to Dutch law. All disputes related to or arising from the use of this advisory will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings."
      },
      {
        "category": "description",
        "text": "Cisco heeft meerdere kwetsbaarheden verholpen in Snort 3, het open source intrusion detection en prevention systeem dat in diverse Cisco-producten wordt gebruikt.",
        "title": "Feiten"
      },
      {
        "category": "description",
        "text": "De kwetsbaarheden bevinden zich in verschillende componenten van de Snort 3 Detection Engine, waaronder de SMTP MIME Decoder, NetFlow Detection Engine, GRE Detection Engine, Teredo Detection Engine, VBA Decompression Engine, en de memory management. Ongeauthenticeerde remote aanvallers kunnen speciaal vervaardigde pakketten of datagrammen versturen die leiden tot onverwachte herstarts van de detectie-engine, wat resulteert in een denial of service. Daarnaast is er een kwetsbaarheid in de control channel socket die een geauthenticeerde lokale aanvaller met lage privileges in staat stelt om arbitrary commands uit te voeren en toegang te krijgen tot het geheugen van het Snort 3 proces. De kwetsbaarheden be\u00efnvloeden de stabiliteit, betrouwbaarheid en continu\u00efteit van netwerkverkeersinspectie en dreigingsdetectie binnen de getroffen Cisco-producten.",
        "title": "Interpretaties"
      },
      {
        "category": "description",
        "text": "Cisco heeft updates en software hardening releases uitgebracht om deze kwetsbaarheden in Snort 3 te verhelpen. Zie bijgevoegde referenties voor meer informatie.",
        "title": "Oplossingen"
      },
      {
        "category": "general",
        "text": "medium",
        "title": "Kans"
      },
      {
        "category": "general",
        "text": "high",
        "title": "Schade"
      },
      {
        "category": "general",
        "text": "Stack-based Buffer Overflow",
        "title": "CWE-121"
      },
      {
        "category": "general",
        "text": "Wrap-around Error",
        "title": "CWE-128"
      },
      {
        "category": "general",
        "text": "Missing Authentication for Critical Function",
        "title": "CWE-306"
      },
      {
        "category": "general",
        "text": "Missing Release of Memory after Effective Lifetime",
        "title": "CWE-401"
      },
      {
        "category": "general",
        "text": "NULL Pointer Dereference",
        "title": "CWE-476"
      },
      {
        "category": "general",
        "text": "Out-of-bounds Write",
        "title": "CWE-787"
      },
      {
        "category": "general",
        "text": "Buffer Access with Incorrect Length Value",
        "title": "CWE-805"
      },
      {
        "category": "general",
        "text": "Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)",
        "title": "CWE-835"
      }
    ],
    "publisher": {
      "category": "coordinator",
      "contact_details": "cert@ncsc.nl",
      "name": "Nationaal Cyber Security Centrum",
      "namespace": "https://www.ncsc.nl/"
    },
    "references": [
      {
        "category": "external",
        "summary": "Reference",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-opensrc-snort3-2fXGJPfe"
      },
      {
        "category": "external",
        "summary": "Reference",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-gre-JNpMHrTv"
      },
      {
        "category": "external",
        "summary": "Reference",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-gtpcodec-dos-Rmecfepz"
      },
      {
        "category": "external",
        "summary": "Reference",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-mime-vulns-bkXjcKkt"
      },
      {
        "category": "external",
        "summary": "Reference",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-misc-dos-6mB22qAK"
      },
      {
        "category": "external",
        "summary": "Reference",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-vba-bufdos-jAuFdvn9"
      }
    ],
    "title": "Kwetsbaarheden verholpen in Snort 3 van Cisco",
    "tracking": {
      "current_release_date": "2026-10-22T12:06:34.527469Z",
      "generator": {
        "date": "2025-08-04T16:30:00Z",
        "engine": {
          "name": "V.A.",
          "version": "1.3"
        }
      },
      "id": "NCSC-2026-0450",
      "initial_release_date": "2026-10-22T12:06:34.527469Z",
      "revision_history": [
        {
          "date": "2026-10-22T12:06:34.527469Z",
          "number": "1.0.0",
          "summary": "Initiele versie"
        }
      ],
      "status": "final",
      "version": "1.0.0"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:unknown/*",
                "product": {
                  "name": "vers:unknown/*",
                  "product_id": "CSAFPID-1"
                }
              }
            ],
            "category": "product_name",
            "name": "Cisco Cyber Vision"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:unknown/*",
                "product": {
                  "name": "vers:unknown/*",
                  "product_id": "CSAFPID-2"
                }
              }
            ],
            "category": "product_name",
            "name": "Cisco Firepower 1000 Series"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:unknown/*",
                "product": {
                  "name": "vers:unknown/*",
                  "product_id": "CSAFPID-3"
                }
              }
            ],
            "category": "product_name",
            "name": "Cisco Firepower 2100 Series"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:unknown/*",
                "product": {
                  "name": "vers:unknown/*",
                  "product_id": "CSAFPID-4"
                }
              }
            ],
            "category": "product_name",
            "name": "Cisco Open Source Snort3"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:unknown/*",
                "product": {
                  "name": "vers:unknown/*",
                  "product_id": "CSAFPID-5"
                }
              }
            ],
            "category": "product_name",
            "name": "Cisco Secure Firewall 4200 Series"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:unknown/*",
                "product": {
                  "name": "vers:unknown/*",
                  "product_id": "CSAFPID-6"
                }
              }
            ],
            "category": "product_name",
            "name": "Cisco Secure Firewall Threat Defense (FTD) Software"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:unknown/*",
                "product": {
                  "name": "vers:unknown/*",
                  "product_id": "CSAFPID-7"
                }
              }
            ],
            "category": "product_name",
            "name": "Cisco UTD SNORT IPS Engine Software"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:unknown/*",
                "product": {
                  "name": "vers:unknown/*",
                  "product_id": "CSAFPID-8"
                }
              }
            ],
            "category": "product_name",
            "name": "Cisco Umbrella Insights Virtual Appliance"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:unknown/*",
                "product": {
                  "name": "vers:unknown/*",
                  "product_id": "CSAFPID-9"
                }
              }
            ],
            "category": "product_name",
            "name": "Cyber Vision"
          }
        ],
        "category": "vendor",
        "name": "Cisco"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-20011",
      "cwe": {
        "id": "CWE-805",
        "name": "Buffer Access with Incorrect Length Value"
      },
      "notes": [
        {
          "category": "other",
          "text": "Buffer Access with Incorrect Length Value",
          "title": "CWE-805"
        },
        {
          "category": "description",
          "text": "A vulnerability in the Snort 3 SMTP MIME Decoder in multiple Cisco products allows an unauthenticated remote attacker to cause the Snort 3 Detection Engine to restart due to insufficient error checking in MIME field parsing, resulting in denial of service.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6",
          "CSAFPID-7",
          "CSAFPID-8",
          "CSAFPID-9"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-20011 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20011.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.8,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4",
            "CSAFPID-5",
            "CSAFPID-6",
            "CSAFPID-7",
            "CSAFPID-8",
            "CSAFPID-9"
          ]
        }
      ],
      "title": "CVE-2026-20011"
    },
    {
      "cve": "CVE-2026-20019",
      "cwe": {
        "id": "CWE-835",
        "name": "Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)"
      },
      "notes": [
        {
          "category": "other",
          "text": "Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)",
          "title": "CWE-835"
        },
        {
          "category": "other",
          "text": "Wrap-around Error",
          "title": "CWE-128"
        },
        {
          "category": "other",
          "text": "Missing Release of Memory after Effective Lifetime",
          "title": "CWE-401"
        },
        {
          "category": "description",
          "text": "A vulnerability in the Snort 3 NetFlow Detection Engine across multiple Cisco products allows unauthenticated remote attackers to send crafted NetFlow packets that cause engine restarts, resulting in denial of service.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6",
          "CSAFPID-7",
          "CSAFPID-8",
          "CSAFPID-9"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-20019 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20019.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.8,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4",
            "CSAFPID-5",
            "CSAFPID-6",
            "CSAFPID-7",
            "CSAFPID-8",
            "CSAFPID-9"
          ]
        }
      ],
      "title": "CVE-2026-20019"
    },
    {
      "cve": "CVE-2026-20043",
      "cwe": {
        "id": "CWE-787",
        "name": "Out-of-bounds Write"
      },
      "notes": [
        {
          "category": "other",
          "text": "Out-of-bounds Write",
          "title": "CWE-787"
        },
        {
          "category": "description",
          "text": "Cisco\u0027s Open Source Snort 3 Software engineering team conducted an internal security review that identified and fixed multiple vulnerabilities, including an out-of-bounds write (CVE-2026-20043), resulting in software hardening releases.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6",
          "CSAFPID-7",
          "CSAFPID-8",
          "CSAFPID-9"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-20043 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20043.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 9.0,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4",
            "CSAFPID-5",
            "CSAFPID-6",
            "CSAFPID-7",
            "CSAFPID-8",
            "CSAFPID-9"
          ]
        }
      ],
      "title": "CVE-2026-20043"
    },
    {
      "cve": "CVE-2026-20179",
      "cwe": {
        "id": "CWE-128",
        "name": "Wrap-around Error"
      },
      "notes": [
        {
          "category": "other",
          "text": "Wrap-around Error",
          "title": "CWE-128"
        },
        {
          "category": "other",
          "text": "Missing Release of Memory after Effective Lifetime",
          "title": "CWE-401"
        },
        {
          "category": "other",
          "text": "Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)",
          "title": "CWE-835"
        },
        {
          "category": "description",
          "text": "Multiple vulnerabilities in the Snort 3 GRE Detection Engine across various Cisco products allow unauthenticated remote attackers to send crafted GRE packets that cause the detection engine to restart, resulting in denial of service.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6",
          "CSAFPID-7",
          "CSAFPID-8",
          "CSAFPID-9"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-20179 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20179.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.8,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4",
            "CSAFPID-5",
            "CSAFPID-6",
            "CSAFPID-7",
            "CSAFPID-8",
            "CSAFPID-9"
          ]
        }
      ],
      "title": "CVE-2026-20179"
    },
    {
      "cve": "CVE-2026-20197",
      "cwe": {
        "id": "CWE-128",
        "name": "Wrap-around Error"
      },
      "notes": [
        {
          "category": "other",
          "text": "Wrap-around Error",
          "title": "CWE-128"
        },
        {
          "category": "other",
          "text": "Missing Release of Memory after Effective Lifetime",
          "title": "CWE-401"
        },
        {
          "category": "other",
          "text": "Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)",
          "title": "CWE-835"
        },
        {
          "category": "description",
          "text": "Multiple Cisco products are affected by a vulnerability in the Snort 3 Teredo Detection Engine that allows unauthenticated remote attackers to send crafted packets causing unexpected engine restarts and denial of service.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6",
          "CSAFPID-7",
          "CSAFPID-8",
          "CSAFPID-9"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-20197 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20197.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.8,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4",
            "CSAFPID-5",
            "CSAFPID-6",
            "CSAFPID-7",
            "CSAFPID-8",
            "CSAFPID-9"
          ]
        }
      ],
      "title": "CVE-2026-20197"
    },
    {
      "cve": "CVE-2026-20218",
      "cwe": {
        "id": "CWE-121",
        "name": "Stack-based Buffer Overflow"
      },
      "notes": [
        {
          "category": "other",
          "text": "Stack-based Buffer Overflow",
          "title": "CWE-121"
        },
        {
          "category": "description",
          "text": "A vulnerability in the Snort 3 VBA Decompression Engine of multiple Cisco products allows an unauthenticated remote attacker to cause the Snort 3 Detection Engine to restart unexpectedly, resulting in a denial of service due to improper range checking during VBA data decompression.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6",
          "CSAFPID-7",
          "CSAFPID-8",
          "CSAFPID-9"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-20218 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20218.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.8,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4",
            "CSAFPID-5",
            "CSAFPID-6",
            "CSAFPID-7",
            "CSAFPID-8",
            "CSAFPID-9"
          ]
        }
      ],
      "title": "CVE-2026-20218"
    },
    {
      "cve": "CVE-2026-20221",
      "cwe": {
        "id": "CWE-476",
        "name": "NULL Pointer Dereference"
      },
      "notes": [
        {
          "category": "other",
          "text": "NULL Pointer Dereference",
          "title": "CWE-476"
        },
        {
          "category": "description",
          "text": "A vulnerability in Cisco\u0027s Snort 3 Detection Engine GRE tunnel decapsulation feature allows unauthenticated remote attackers to cause unexpected engine restarts, potentially leading to denial of service or bypass conditions.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6",
          "CSAFPID-7",
          "CSAFPID-8",
          "CSAFPID-9"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-20221 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20221.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.8,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4",
            "CSAFPID-5",
            "CSAFPID-6",
            "CSAFPID-7",
            "CSAFPID-8",
            "CSAFPID-9"
          ]
        }
      ],
      "title": "CVE-2026-20221"
    },
    {
      "cve": "CVE-2026-20236",
      "cwe": {
        "id": "CWE-787",
        "name": "Out-of-bounds Write"
      },
      "notes": [
        {
          "category": "other",
          "text": "Out-of-bounds Write",
          "title": "CWE-787"
        },
        {
          "category": "description",
          "text": "Cisco\u0027s Open Source Snort 3 team conducted an internal security review resulting in software hardening releases that fix multiple vulnerabilities, including those related to incorrect calculations classified under CWE-682 and tracked by CVE-2026-20236.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6",
          "CSAFPID-7",
          "CSAFPID-8",
          "CSAFPID-9"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-20236 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20236.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4",
            "CSAFPID-5",
            "CSAFPID-6",
            "CSAFPID-7",
            "CSAFPID-8",
            "CSAFPID-9"
          ]
        }
      ],
      "title": "CVE-2026-20236"
    },
    {
      "cve": "CVE-2026-20291",
      "cwe": {
        "id": "CWE-787",
        "name": "Out-of-bounds Write"
      },
      "notes": [
        {
          "category": "other",
          "text": "Out-of-bounds Write",
          "title": "CWE-787"
        },
        {
          "category": "description",
          "text": "Cisco\u0027s Open Source Snort 3 team conducted an internal security review that identified and resolved multiple issues, including privilege management vulnerabilities tracked as CVE-2026-20291 (CWE-269), resulting in software hardening releases.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6",
          "CSAFPID-7",
          "CSAFPID-8",
          "CSAFPID-9"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-20291 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20291.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4",
            "CSAFPID-5",
            "CSAFPID-6",
            "CSAFPID-7",
            "CSAFPID-8",
            "CSAFPID-9"
          ]
        }
      ],
      "title": "CVE-2026-20291"
    },
    {
      "cve": "CVE-2026-20356",
      "cwe": {
        "id": "CWE-787",
        "name": "Out-of-bounds Write"
      },
      "notes": [
        {
          "category": "other",
          "text": "Out-of-bounds Write",
          "title": "CWE-787"
        },
        {
          "category": "description",
          "text": "Cisco\u0027s Open Source Snort 3 engineering team conducted an internal security review resulting in software hardening releases that address multiple vulnerabilities, including uncontrolled resource consumption (CVE-2026-20356, CWE-400).",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6",
          "CSAFPID-7",
          "CSAFPID-8",
          "CSAFPID-9"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-20356 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20356.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4",
            "CSAFPID-5",
            "CSAFPID-6",
            "CSAFPID-7",
            "CSAFPID-8",
            "CSAFPID-9"
          ]
        }
      ],
      "title": "CVE-2026-20356"
    },
    {
      "cve": "CVE-2026-76445",
      "cwe": {
        "id": "CWE-835",
        "name": "Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)"
      },
      "notes": [
        {
          "category": "other",
          "text": "Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)",
          "title": "CWE-835"
        },
        {
          "category": "description",
          "text": "A vulnerability in the Snort 3 Detection Engine of multiple Cisco products allows an unauthenticated remote attacker to cause denial of service by sending crafted fragmented UDP datagrams with GPRS Tunneling Protocol extension headers, triggering an infinite loop and engine restart.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6",
          "CSAFPID-7",
          "CSAFPID-8",
          "CSAFPID-9"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-76445 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-76445.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4",
            "CSAFPID-5",
            "CSAFPID-6",
            "CSAFPID-7",
            "CSAFPID-8",
            "CSAFPID-9"
          ]
        }
      ],
      "title": "CVE-2026-76445"
    },
    {
      "cve": "CVE-2026-76489",
      "cwe": {
        "id": "CWE-401",
        "name": "Missing Release of Memory after Effective Lifetime"
      },
      "notes": [
        {
          "category": "other",
          "text": "Missing Release of Memory after Effective Lifetime",
          "title": "CWE-401"
        },
        {
          "category": "other",
          "text": "Wrap-around Error",
          "title": "CWE-128"
        },
        {
          "category": "other",
          "text": "Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)",
          "title": "CWE-835"
        },
        {
          "category": "description",
          "text": "A vulnerability in the Snort 3 Detection Engine across multiple Cisco products allows unauthenticated remote attackers to cause engine restarts, resulting in denial of service due to improper memory management and error handling.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6",
          "CSAFPID-7",
          "CSAFPID-8",
          "CSAFPID-9"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-76489 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-76489.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.8,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4",
            "CSAFPID-5",
            "CSAFPID-6",
            "CSAFPID-7",
            "CSAFPID-8",
            "CSAFPID-9"
          ]
        }
      ],
      "title": "CVE-2026-76489"
    },
    {
      "cve": "CVE-2026-76524",
      "cwe": {
        "id": "CWE-306",
        "name": "Missing Authentication for Critical Function"
      },
      "notes": [
        {
          "category": "other",
          "text": "Missing Authentication for Critical Function",
          "title": "CWE-306"
        },
        {
          "category": "description",
          "text": "A vulnerability in the control channel socket of Open Source Snort 3 allows an authenticated local attacker with low privileges to execute arbitrary commands and access process memory due to missing authentication.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6",
          "CSAFPID-7",
          "CSAFPID-8",
          "CSAFPID-9"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-76524 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-76524.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4",
            "CSAFPID-5",
            "CSAFPID-6",
            "CSAFPID-7",
            "CSAFPID-8",
            "CSAFPID-9"
          ]
        }
      ],
      "title": "CVE-2026-76524"
    }
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON

Loading timeline…




    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.