{
  "schema_version": "1.6.0",
  "id": "STRONGSWAN-CVE-2021-41991",
  "aliases": [
    "CVE-2021-41991"
  ],
  "modified": "2026-09-25T10:51:01Z",
  "affected": [
    {
      "ranges": [
        {
          "type": "SEMVER",
          "events": [
            {
              "introduced": "4.2.10"
            },
            {
              "fixed": "5.9.4"
            }
          ]
        },
        {
          "type": "GIT",
          "repo": "https://github.com/strongswan/strongswan.git",
          "events": [
            {
              "introduced": "764e8b2211ce953908b462e74262bc2d0716ff13"
            },
            {
              "fixed": "dceed8e099c8f9d5606fa7e5a0742fb5e023103b"
            }
          ]
        }
      ]
    }
  ],
  "database_specific": {
    "package": "strongswan"
  },
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://strongswan.org/security/CVE-2021-41991.html"
    },
    {
      "type": "WEB",
      "url": "https://download.strongswan.org/security/CVE-2021-41991"
    }
  ],
  "published": "2021-10-18T12:00:00Z",
  "summary": "A denial-of-service vulnerability in the in-memory certificate cache was discovered.",
  "credits": [
    {
      "name": "NSA",
      "type": "FINDER"
    }
  ]
}