Security advisory

{
  "id": "17b2291288f246ccd8f93c630787a49868b1dc83c3b9185ac85b757d8f1648fc",
  "url": "https://osv.dev/vulnerability/CVE-2021-25635",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-25635",
    "summary": "An Improper Certificate Validation vulnerability in LibreOffice allowed an attacker to self sign an ODF document, with a signature untrusted by the target, then modify it to change the signature algorithm to an invalid (or unknown to LibreOffice) algorithm and LibreOffice would incorrectly present such a signature with an unknown algorithm as a valid signature issued by a trusted person This issue affects LibreOffice: from 7.0 before 7.0.5, from 7.1 before 7.1.1.",
    "evidence": "osv:CVE-2021-25635",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-25635",
      "aliases": [
        "CVE-2021-25635"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/libreoffice/core",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "22aa6743f53547be737cebf9a34be16c35f90d6c"
                },
                {
                  "last_affected": "575c5867c4cc13d7ae78f9ce39a54a52ed38c769"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:libreoffice:libreoffice:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "7.0.0"
                      },
                      {
                        "fixed": "7.0.5.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:libreoffice:libreoffice:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "7.1.0.0"
                      },
                      {
                        "last_affected": "7.1.1.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "libreoffice-7.1.1.1",
            "libreoffice-7-1-branch-point",
            "libreoffice-7-0-branch-point",
            "libreoffice-6-4-branch-point",
            "libreoffice-6-3-branch-point",
            "libreoffice-6-2-branch-point",
            "libreoffice-6-1-branch-point",
            "libreoffice-6-0-branch-point",
            "gpg4libre-review-5.4.99",
            "libreoffice-5-4-branch-point",
            "libreoffice-5-3-branch-point",
            "libreoffice-5-2-branch-point",
            "libreoffice-5-1-branch-point",
            "libreoffice-5-0-branch-point",
            "libreoffice-4-4-branch-point",
            "libreoffice-4-3-branch-point",
            "sdremote-2.0.0",
            "libreoffice-4-2-branch-point",
            "libreoffice-4-2-milestone-1",
            "libreoffice-4-1-branch-point",
            "libreoffice-4-0-branch-point",
            "libreoffice-3-6-branch-point",
            "libreoffice-3.5.0.0",
            "libreoffice-3-5-branch-point",
            "windows_build_successful_2011_11_08",
            "MELD_LIBREOFFICE_REPOS"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-25635.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:53.701391186Z",
      "provider": "osv",
      "references": [
        "https://www.libreoffice.org/about-us/security/advisories/cve-2021-25635/"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-25635",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 437979,
  "published_at": "2025-03-21T15:15:35.707+00:00"
}