Vulnerability-Lookup

WID-SEC-W-2026-0825

Vulnerability from csaf_certbund - Published: 2026-03-23 23:00 - Updated: 2026-03-30 22:00

Summary

strongSwan: Schwachstelle ermöglicht Denial of Service

Severity

Mittel

Notes

Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.

Produktbeschreibung: Strongswan ist eine IPSec-basierte VPN Implementierung.

Angriff: Ein entfernter, anonymer Angreifer kann eine Schwachstelle in strongSwan ausnutzen, um einen Denial of Service Angriff durchzuführen.

Betroffene Betriebssysteme: - Linux - Sonstiges - UNIX - Windows

CVE-2026-25075

References

URL

Category

	https://wid.cert-bund.de/.well-known/csaf/white/2…	self
	https://wid.cert-bund.de/portal/wid/securityadvis…	self
	https://www.strongswan.org/blog/2026/03/23/strong…	external
	https://lists.suse.com/pipermail/sle-security-upd…	external
	https://lists.suse.com/pipermail/sle-security-upd…	external
	https://lists.suse.com/pipermail/sle-security-upd…	external
	https://lists.suse.com/pipermail/sle-security-upd…	external
	https://ubuntu.com/security/notices/USN-8117-1	external
	https://lists.debian.org/debian-lts-announce/2026…	external
	https://lists.opensuse.org/archives/list/security…	external

JSON

To clipboard

{
  "document": {
    "aggregate_severity": {
      "text": "mittel"
    },
    "category": "csaf_base",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "de-DE",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
      },
      {
        "category": "description",
        "text": "Strongswan ist eine IPSec-basierte VPN Implementierung.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein entfernter, anonymer Angreifer kann eine Schwachstelle in strongSwan ausnutzen, um einen Denial of Service Angriff durchzuf\u00fchren.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Linux\n- Sonstiges\n- UNIX\n- Windows",
        "title": "Betroffene Betriebssysteme"
      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "csaf-provider@cert-bund.de",
      "name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
      "namespace": "https://www.bsi.bund.de"
    },
    "references": [
      {
        "category": "self",
        "summary": "WID-SEC-W-2026-0825 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0825.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2026-0825 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0825"
      },
      {
        "category": "external",
        "summary": "strongSwan Releases vom 2026-03-23",
        "url": "https://www.strongswan.org/blog/2026/03/23/strongswan-6.0.5-released.html"
      },
      {
        "category": "external",
        "summary": "SUSE Security Update SUSE-SU-2026:0978-1 vom 2026-03-24",
        "url": "https://lists.suse.com/pipermail/sle-security-updates/2026-March/024819.html"
      },
      {
        "category": "external",
        "summary": "SUSE Security Update SUSE-SU-2026:0981-1 vom 2026-03-24",
        "url": "https://lists.suse.com/pipermail/sle-security-updates/2026-March/024816.html"
      },
      {
        "category": "external",
        "summary": "SUSE Security Update SUSE-SU-2026:0979-1 vom 2026-03-24",
        "url": "https://lists.suse.com/pipermail/sle-security-updates/2026-March/024818.html"
      },
      {
        "category": "external",
        "summary": "SUSE Security Update SUSE-SU-2026:0980-1 vom 2026-03-24",
        "url": "https://lists.suse.com/pipermail/sle-security-updates/2026-March/024817.html"
      },
      {
        "category": "external",
        "summary": "Ubuntu Security Notice USN-8117-1 vom 2026-03-23",
        "url": "https://ubuntu.com/security/notices/USN-8117-1"
      },
      {
        "category": "external",
        "summary": "Debian Security Advisory DLA-4512 vom 2026-03-27",
        "url": "https://lists.debian.org/debian-lts-announce/2026/03/msg00016.html"
      },
      {
        "category": "external",
        "summary": "openSUSE Security Update OPENSUSE-SU-2026:10441-1 vom 2026-03-30",
        "url": "https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/BPTMJSZMW4PWZWFN2UOYO2A5QDM5UXSP/"
      }
    ],
    "source_lang": "en-US",
    "title": "strongSwan: Schwachstelle erm\u00f6glicht Denial of Service",
    "tracking": {
      "current_release_date": "2026-03-30T22:00:00.000+00:00",
      "generator": {
        "date": "2026-03-31T08:19:45.756+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.5.0"
        }
      },
      "id": "WID-SEC-W-2026-0825",
      "initial_release_date": "2026-03-23T23:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2026-03-23T23:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        },
        {
          "date": "2026-03-29T22:00:00.000+00:00",
          "number": "2",
          "summary": "Neue Updates von Debian aufgenommen"
        },
        {
          "date": "2026-03-30T22:00:00.000+00:00",
          "number": "3",
          "summary": "Neue Updates von openSUSE aufgenommen"
        }
      ],
      "status": "final",
      "version": "3"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "category": "product_name",
            "name": "Debian Linux",
            "product": {
              "name": "Debian Linux",
              "product_id": "2951",
              "product_identification_helper": {
                "cpe": "cpe:/o:debian:debian_linux:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "Debian"
      },
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c6.0.5",
                "product": {
                  "name": "Open Source strongSwan \u003c6.0.5",
                  "product_id": "T052033"
                }
              },
              {
                "category": "product_version",
                "name": "6.0.5",
                "product": {
                  "name": "Open Source strongSwan 6.0.5",
                  "product_id": "T052033-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:strongswan:strongswan:6.0.5"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "strongSwan"
          }
        ],
        "category": "vendor",
        "name": "Open Source"
      },
      {
        "branches": [
          {
            "category": "product_name",
            "name": "SUSE Linux",
            "product": {
              "name": "SUSE Linux",
              "product_id": "T002207",
              "product_identification_helper": {
                "cpe": "cpe:/o:suse:suse_linux:-"
              }
            }
          },
          {
            "category": "product_name",
            "name": "SUSE openSUSE",
            "product": {
              "name": "SUSE openSUSE",
              "product_id": "T027843",
              "product_identification_helper": {
                "cpe": "cpe:/o:suse:opensuse:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "SUSE"
      },
      {
        "branches": [
          {
            "category": "product_name",
            "name": "Ubuntu Linux",
            "product": {
              "name": "Ubuntu Linux",
              "product_id": "T042768",
              "product_identification_helper": {
                "cpe": "cpe:/o:canonical:ubuntu_linux:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "Ubuntu"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-25075",
      "product_status": {
        "known_affected": [
          "T052033",
          "2951",
          "T002207",
          "T042768",
          "T027843"
        ]
      },
      "release_date": "2026-03-23T23:00:00.000+00:00",
      "title": "CVE-2026-25075"
    }
  ]
}

CVE-2026-25075 (GCVE-0-2026-25075)

Vulnerability from cvelistv5 – Published: 2026-03-23 18:33 – Updated: 2026-03-27 19:17

Title

strongSwan 4.5.0 < 6.0.5 EAP-TTLS AVP Parsing Integer Underflow

Summary

strongSwan versions 4.5.0 prior to 6.0.5 contain an integer underflow vulnerability in the EAP-TTLS AVP parser that allows unauthenticated remote attackers to cause a denial of service by sending crafted AVP data with invalid length fields during IKEv2 authentication. Attackers can exploit the failure to validate AVP length fields before subtraction to trigger excessive memory allocation or NULL pointer dereference, crashing the charon IKE daemon.

Severity ?

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

CWE-191 - Integer underflow (wrap or wraparound)
CWE-476 - NULL pointer dereference

Assigner

VulnCheck

References

URL

Tags

	https://www.strongswan.org/blog/2026/03/23/strong…	vendor-advisoryexploit
	https://www.strongswan.org/blog/2026/03/23/strong…	release-notes
	https://www.vulncheck.com/advisories/strongswan-e…	third-party-advisory

Impacted products

	Vendor	Product	Version
	strongSwan	strongSwan	Affected: 4.5.0 , < 6.0.5 (semver)

Credits

Kazuma Matsumoto, a security researcher at GMO Cybersecurity by IERAE, Inc. VulnCheck

Show details on NVD website

JSON

To clipboard

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  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-25075",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-25T14:29:53.640147Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-25T14:31:31.421Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2026-03-27T19:17:30.660Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "https://lists.debian.org/debian-lts-announce/2026/03/msg00016.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "strongSwan",
          "repo": "https://github.com/strongswan/strongswan",
          "vendor": "strongSwan",
          "versions": [
            {
              "lessThan": "6.0.5",
              "status": "affected",
              "version": "4.5.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Kazuma Matsumoto, a security researcher at GMO Cybersecurity by IERAE, Inc."
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "VulnCheck"
        }
      ],
      "descriptions": [
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              "type": "text/html",
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            }
          ],
          "value": "strongSwan versions 4.5.0 prior to 6.0.5 contain an integer underflow vulnerability in the EAP-TTLS AVP parser that allows unauthenticated remote attackers to cause a denial of service by sending crafted AVP data with invalid length fields during IKEv2 authentication. Attackers can exploit the failure to validate AVP length fields before subtraction to trigger excessive memory allocation or NULL pointer dereference, crashing the charon IKE daemon."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
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              "lang": "en",
              "value": "GENERAL"
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            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
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      "problemTypes": [
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              "description": "CWE-191 Integer underflow (wrap or wraparound)",
              "lang": "en",
              "type": "CWE"
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        },
        {
          "descriptions": [
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              "description": "CWE-476 NULL pointer dereference",
              "lang": "en",
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-23T19:16:09.076Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "tags": [
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            "exploit"
          ],
          "url": "https://www.strongswan.org/blog/2026/03/23/strongswan-vulnerability-(cve-2026-25075).html"
        },
        {
          "tags": [
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          ],
          "url": "https://www.strongswan.org/blog/2026/03/23/strongswan-6.0.5-released.html"
        },
        {
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/strongswan-eap-ttls-avp-parsing-integer-underflow"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "strongSwan 4.5.0 \u003c 6.0.5 EAP-TTLS AVP Parsing Integer Underflow",
      "x_generator": {
        "engine": "Vulnogram 1.0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-25075",
    "datePublished": "2026-03-23T18:33:10.952Z",
    "dateReserved": "2026-01-28T21:47:35.121Z",
    "dateUpdated": "2026-03-27T19:17:30.660Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Action not permitted

WID-SEC-W-2026-0825

CVE-2026-25075 (GCVE-0-2026-25075)

Tags

Sightings

Nomenclature