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CVE-2021-25634

Estado: ModificadaAlta (7.5)—

LibreOffice supports digital signatures of ODF documents and macros within documents, presenting visual aids that no alteration of the document occurred since the last signing and that the signature is valid. An Improper Certificate Validation vulnerability in LibreOffice allowed an attacker to modify a digitally signed ODF document to insert an additional signing time timestamp which LibreOffice would incorrectly present as a valid signature signed at the bogus signing time. This issue affects: The Document Foundation LibreOffice 7-0 versions prior to 7.0.6; 7-1 versions prior to 7.1.2.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (2)

Debian — Debian LinuxLibreoffice — Libreoffice

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-25634",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
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        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security@documentfoundation.org",
      "affectedData": [
        {
          "vendor": "The Document Foundation",
          "product": "LibreOffice",
          "versions": [
            {
              "status": "affected",
              "version": "7-0",
              "lessThan": "7.0.6",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "7-1",
              "lessThan": "7.1.2",
              "versionType": "custom"
            }
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        }
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  ],
  "published": "2021-10-12T14:15:08.290",
  "references": [
    {
      "url": "https://www.debian.org/security/2021/dsa-4988",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "security@documentfoundation.org"
    },
    {
      "url": "https://www.libreoffice.org/about-us/security/advisories/CVE-2021-25634",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "security@documentfoundation.org"
    },
    {
      "url": "https://www.debian.org/security/2021/dsa-4988",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.libreoffice.org/about-us/security/advisories/CVE-2021-25634",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security@documentfoundation.org",
      "description": [
        {
          "lang": "en",
          "value": "CWE-295"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-295"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "LibreOffice supports digital signatures of ODF documents and macros within documents, presenting visual aids that no alteration of the document occurred since the last signing and that the signature is valid. An Improper Certificate Validation vulnerability in LibreOffice allowed an attacker to modify a digitally signed ODF document to insert an additional signing time timestamp which LibreOffice would incorrectly present as a valid signature signed at the bogus signing time. This issue affects: The Document Foundation LibreOffice 7-0 versions prior to 7.0.6; 7-1 versions prior to 7.1.2."
    },
    {
      "lang": "es",
      "value": "LibreOffice soporta firmas digitales de documentos ODF y macros dentro de documentos, presentando ayudas visuales de que no se ha producido ninguna alteración del documento desde la última firma y que la firma es válida. Una vulnerabilidad de Comprobación Inapropiada de Certificados en LibreOffice permitía a un atacante modificar un documento ODF firmado digitalmente para insertar una marca de tiempo de firma adicional que LibreOffice presentaría incorrectamente como una firma válida firmada en la hora de firma falsa. Este problema afecta a: Las versiones de LibreOffice 7-0 de The Document Foundation anteriores a 7.0.6; las versiones 7-1 anteriores a 7.1.2"
    }
  ],
  "lastModified": "2026-06-17T03:42:15.307",
  "configurations": [
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}