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CVE-2021-25635

Estado: AnalizadaMedia (5.2)—

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.

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 (1)

Libreoffice — Libreoffice

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2021-25635",
  "cveTags": [],
  "metrics": {
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        "ssvcData": {
          "id": "CVE-2021-25635",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
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          ],
          "version": "2.0.3",
          "timestamp": "2025-03-21T15:13:07.905943Z"
        }
      }
    ],
    "cvssMetricV31": [
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        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
    ],
    "cvssMetricV40": [
      {
        "type": "Secondary",
        "source": "security@documentfoundation.org",
        "cvssData": {
          "Safety": "NOT_DEFINED",
          "version": "4.0",
          "Recovery": "NOT_DEFINED",
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          "Automatable": "NOT_DEFINED",
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "exploitMaturity": "NOT_DEFINED",
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          "integrityRequirement": "NOT_DEFINED",
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          "availabilityRequirement": "NOT_DEFINED",
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          "subConfidentialityImpact": "HIGH",
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          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
        }
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    ]
  },
  "affected": [
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      "source": "security@documentfoundation.org",
      "affectedData": [
        {
          "vendor": "The Document Foundation",
          "product": "LibreOffice",
          "versions": [
            {
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              "version": "7.0",
              "lessThan": "7.0.5",
              "versionType": "7.0 series"
            },
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              "version": "7.1",
              "lessThan": "7.1.1",
              "versionType": "7.1 series"
            }
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  ],
  "published": "2025-03-21T15:15:35.707",
  "references": [
    {
      "url": "https://www.libreoffice.org/about-us/security/advisories/cve-2021-25635/",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "security@documentfoundation.org"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security@documentfoundation.org",
      "description": [
        {
          "lang": "en",
          "value": "CWE-295"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "An Improper Certificate Validation vulnerability in LibreOffice allowed \nan attacker to self sign an ODF document, with a signature untrusted by \nthe target, then modify it to change the signature algorithm to an \ninvalid (or unknown to LibreOffice) algorithm and LibreOffice would incorrectly present such a signature with an unknown algorithm as a \nvalid signature issued by a trusted person\n\n\nThis issue affects LibreOffice: from 7.0 before 7.0.5, from 7.1 before 7.1.1."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de validación de certificado incorrecta en LibreOffice permitió a un atacante autofirmar un documento ODF, con una firma que no era de confianza para el destino, y luego modificarlo para cambiar el algoritmo de firma a uno no válido (o desconocido para LibreOffice) y LibreOffice presentaría incorrectamente dicha firma con un algoritmo desconocido como una firma válida emitida por una persona confiable. Este problema afecta a LibreOffice: desde 7.0 antes de 7.0.5, desde 7.1 antes de 7.1.1."
    }
  ],
  "lastModified": "2026-06-17T03:42:15.420",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "versionEndExcluding": "7.0.5.1",
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            },
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              "matchCriteriaId": "381AA7ED-22CB-4BC0-8DF5-6CE16A741C26",
              "versionEndIncluding": "7.1.1.1",
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            }
          ],
          "operator": "OR"
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  "sourceIdentifier": "security@documentfoundation.org"
}