NCSC-2026-0104

Vulnerability from csaf_ncscnl - Published: 2026-03-26 09:50 - Updated: 2026-03-26 09:50
Summary
Kwetsbaarheden verholpen in Cisco IOS XE Software
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 kwetsbaarheden verholpen in Cisco IOS XE Software, specifiek voor verschillende producten zoals Catalyst 9000 Series Switches, Catalyst CW9800 Family, en Cisco Meraki.
Interpretaties: De kwetsbaarheden omvatten verschillende problemen, zoals een geheugenlek in de IKEv2-implementatie, kwetsbaarheden in de DHCP-snooping functie, en onjuiste verwerking van CAPWAP-pakketten die leiden tot een denial of service. Daarnaast zijn er kwetsbaarheden gerapporteerd die het mogelijk maken voor ongeauthenticeerde aanvallers om toegang te krijgen tot gevoelige apparaatconfiguraties en om privileges te verhogen via de Lobby Ambassador API. Ook zijn er problemen met onjuiste privilege-toewijzingen en een kritieke kwetsbaarheid in de bootloader die lokale of fysieke toegang vereisen voor exploitatie. De SCP-serverfunctie is ook kwetsbaar voor denial of service door onjuiste verwerking van SCP-verzoeken.
Oplossingen: Cisco heeft updates uitgebracht om de kwetsbaarheden te verhelpen. Zie bijgevoegde referenties voor meer informatie.
Kans: medium
Schade: high
CWE-124: Buffer Underwrite ('Buffer Underflow')
CWE-228: Improper Handling of Syntactically Invalid Structure
CWE-230: Improper Handling of Missing Values
CWE-235: Improper Handling of Extra Parameters
CWE-266: Incorrect Privilege Assignment
CWE-319: Cleartext Transmission of Sensitive Information
CWE-400: Uncontrolled Resource Consumption
CWE-401: Missing Release of Memory after Effective Lifetime
CWE-771: Missing Reference to Active Allocated Resource
CWE-1286: Improper Validation of Syntactic Correctness of Input
CVE-2026-20012

A vulnerability in the IKEv2 feature of multiple Cisco software products allows an unauthenticated remote attacker to cause a memory leak resulting in denial of service, necessitating a manual reboot to restore service.

8.6 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CWE-401 - Missing Release of Memory after Effective Lifetime
CVE-2026-20084

A vulnerability in Cisco IOS XE's DHCP snooping feature on Catalyst 9000 Series Switches allows unauthenticated remote attackers to forward BOOTP packets between VLANs, causing VLAN leakage, high CPU usage, and denial of service.

8.6 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CVE-2026-20086

A vulnerability in Cisco IOS XE Wireless Controller Software for the Catalyst CW9800 Family allows unauthenticated remote attackers to cause denial of service by sending malformed CAPWAP packets, resulting in device reloads.

8.6 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CWE-230 - Improper Handling of Missing Values
CVE-2026-20004

A vulnerability in the TLS library of Cisco IOS XE Software allows an unauthenticated, adjacent attacker to exhaust device memory during TLS connection setup due to improper memory management, potentially causing denial of service.

7.4 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CWE-771 - Missing Reference to Active Allocated Resource
CVE-2026-20115

A vulnerability in Cisco IOS XE Software for Cisco Meraki allows remote, unauthenticated attackers to access confidential device information by exploiting insecure device configuration uploads via an on-path attack.

6.1 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N
CWE-319 - Cleartext Transmission of Sensitive Information
CVE-2026-20125

An authenticated remote attacker can exploit a vulnerability in the HTTP Server feature of Cisco IOS and IOS XE Software Release 3E by sending malformed HTTP requests, causing an unexpected device reload and denial of service.

7.7 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
CWE-228 - Improper Handling of Syntactically Invalid Structure
CVE-2026-20114

A vulnerability in Cisco IOS XE's Lobby Ambassador web-based management API allows authenticated remote attackers to elevate privileges by exploiting insufficient parameter validation, potentially creating new users with elevated access.

5.4 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CWE-1286 - Improper Validation of Syntactic Correctness of Input
CVE-2026-20110

A vulnerability in Cisco IOS XE CLI allows an authenticated local attacker to cause a denial of service by exploiting incorrect privileges on the start maintenance command, which puts the device into maintenance mode and shuts down interfaces.

6.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
CWE-266 - Incorrect Privilege Assignment
CVE-2026-20104

A bootloader vulnerability in Cisco IOS XE Software for Cisco Catalyst 9200 Series and Rugged Series Switches allows local attackers to execute arbitrary code at boot time, bypassing integrity checks and signed image requirements.

6.1 (Medium)
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE-124 - Buffer Underwrite ('Buffer Underflow')
CVE-2026-20083

A vulnerability in the SCP server feature of Cisco IOS XE Software allows an authenticated local attacker with low privileges to cause a denial of service by sending a malformed SCP request via SSH, potentially causing device reloads.

6.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
CWE-235 - Improper Handling of Extra Parameters
References
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      "notes": [
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          "title": "Summary"
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            "CSAFPID-12"
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      "title": "CVE-2026-20086"
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      },
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        {
          "category": "other",
          "text": "Missing Reference to Active Allocated Resource",
          "title": "CWE-771"
        },
        {
          "category": "description",
          "text": "A vulnerability in the TLS library of Cisco IOS XE Software allows an unauthenticated, adjacent attacker to exhaust device memory during TLS connection setup due to improper memory management, potentially causing 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",
          "CSAFPID-10",
          "CSAFPID-11",
          "CSAFPID-12"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-20004 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20004.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/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",
            "CSAFPID-10",
            "CSAFPID-11",
            "CSAFPID-12"
          ]
        }
      ],
      "title": "CVE-2026-20004"
    },
    {
      "cve": "CVE-2026-20115",
      "cwe": {
        "id": "CWE-319",
        "name": "Cleartext Transmission of Sensitive Information"
      },
      "notes": [
        {
          "category": "other",
          "text": "Cleartext Transmission of Sensitive Information",
          "title": "CWE-319"
        },
        {
          "category": "description",
          "text": "A vulnerability in Cisco IOS XE Software for Cisco Meraki allows remote, unauthenticated attackers to access confidential device information by exploiting insecure device configuration uploads via an on-path attack.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6",
          "CSAFPID-7",
          "CSAFPID-8",
          "CSAFPID-9",
          "CSAFPID-10",
          "CSAFPID-11",
          "CSAFPID-12"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-20115 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20115.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.1,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4",
            "CSAFPID-5",
            "CSAFPID-6",
            "CSAFPID-7",
            "CSAFPID-8",
            "CSAFPID-9",
            "CSAFPID-10",
            "CSAFPID-11",
            "CSAFPID-12"
          ]
        }
      ],
      "title": "CVE-2026-20115"
    },
    {
      "cve": "CVE-2026-20125",
      "cwe": {
        "id": "CWE-228",
        "name": "Improper Handling of Syntactically Invalid Structure"
      },
      "notes": [
        {
          "category": "other",
          "text": "Improper Handling of Syntactically Invalid Structure",
          "title": "CWE-228"
        },
        {
          "category": "description",
          "text": "An authenticated remote attacker can exploit a vulnerability in the HTTP Server feature of Cisco IOS and IOS XE Software Release 3E by sending malformed HTTP requests, causing an unexpected device reload 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",
          "CSAFPID-10",
          "CSAFPID-11",
          "CSAFPID-12"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-20125 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20125.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.7,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/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",
            "CSAFPID-10",
            "CSAFPID-11",
            "CSAFPID-12"
          ]
        }
      ],
      "title": "CVE-2026-20125"
    },
    {
      "cve": "CVE-2026-20114",
      "cwe": {
        "id": "CWE-1286",
        "name": "Improper Validation of Syntactic Correctness of Input"
      },
      "notes": [
        {
          "category": "other",
          "text": "Improper Validation of Syntactic Correctness of Input",
          "title": "CWE-1286"
        },
        {
          "category": "description",
          "text": "A vulnerability in Cisco IOS XE\u0027s Lobby Ambassador web-based management API allows authenticated remote attackers to elevate privileges by exploiting insufficient parameter validation, potentially creating new users with elevated access.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6",
          "CSAFPID-7",
          "CSAFPID-8",
          "CSAFPID-9",
          "CSAFPID-10",
          "CSAFPID-11",
          "CSAFPID-12"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-20114 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20114.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.4,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4",
            "CSAFPID-5",
            "CSAFPID-6",
            "CSAFPID-7",
            "CSAFPID-8",
            "CSAFPID-9",
            "CSAFPID-10",
            "CSAFPID-11",
            "CSAFPID-12"
          ]
        }
      ],
      "title": "CVE-2026-20114"
    },
    {
      "cve": "CVE-2026-20110",
      "cwe": {
        "id": "CWE-266",
        "name": "Incorrect Privilege Assignment"
      },
      "notes": [
        {
          "category": "other",
          "text": "Incorrect Privilege Assignment",
          "title": "CWE-266"
        },
        {
          "category": "description",
          "text": "A vulnerability in Cisco IOS XE CLI allows an authenticated local attacker to cause a denial of service by exploiting incorrect privileges on the start maintenance command, which puts the device into maintenance mode and shuts down interfaces.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6",
          "CSAFPID-7",
          "CSAFPID-8",
          "CSAFPID-9",
          "CSAFPID-10",
          "CSAFPID-11",
          "CSAFPID-12"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-20110 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20110.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/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",
            "CSAFPID-10",
            "CSAFPID-11",
            "CSAFPID-12"
          ]
        }
      ],
      "title": "CVE-2026-20110"
    },
    {
      "cve": "CVE-2026-20104",
      "cwe": {
        "id": "CWE-124",
        "name": "Buffer Underwrite (\u0027Buffer Underflow\u0027)"
      },
      "notes": [
        {
          "category": "other",
          "text": "Buffer Underwrite (\u0027Buffer Underflow\u0027)",
          "title": "CWE-124"
        },
        {
          "category": "description",
          "text": "A bootloader vulnerability in Cisco IOS XE Software for Cisco Catalyst 9200 Series and Rugged Series Switches allows local attackers to execute arbitrary code at boot time, bypassing integrity checks and signed image requirements.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6",
          "CSAFPID-7",
          "CSAFPID-8",
          "CSAFPID-9",
          "CSAFPID-10",
          "CSAFPID-11",
          "CSAFPID-12"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-20104 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20104.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.1,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4",
            "CSAFPID-5",
            "CSAFPID-6",
            "CSAFPID-7",
            "CSAFPID-8",
            "CSAFPID-9",
            "CSAFPID-10",
            "CSAFPID-11",
            "CSAFPID-12"
          ]
        }
      ],
      "title": "CVE-2026-20104"
    },
    {
      "cve": "CVE-2026-20083",
      "cwe": {
        "id": "CWE-235",
        "name": "Improper Handling of Extra Parameters"
      },
      "notes": [
        {
          "category": "other",
          "text": "Improper Handling of Extra Parameters",
          "title": "CWE-235"
        },
        {
          "category": "description",
          "text": "A vulnerability in the SCP server feature of Cisco IOS XE Software allows an authenticated local attacker with low privileges to cause a denial of service by sending a malformed SCP request via SSH, potentially causing device reloads.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6",
          "CSAFPID-7",
          "CSAFPID-8",
          "CSAFPID-9",
          "CSAFPID-10",
          "CSAFPID-11",
          "CSAFPID-12"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-20083 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20083.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/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",
            "CSAFPID-10",
            "CSAFPID-11",
            "CSAFPID-12"
          ]
        }
      ],
      "title": "CVE-2026-20083"
    }
  ]
}


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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

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.



Detection rules are retrieved from Rulezet.