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CVE-2020-17525

Estado: ModificadaAlta (7.5)—

Subversion's mod_authz_svn module will crash if the server is using in-repository authz rules with the AuthzSVNReposRelativeAccessFile option and a client sends a request for a non-existing repository URL. This can lead to disruption for users of the service. This issue was fixed in mod_dav_svn+mod_authz_svn servers 1.14.1 and mod_dav_svn+mod_authz_svn servers 1.10.7

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)

Apache — SubversionDebian — Debian Linux

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2020-17525",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "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:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security@apache.org",
      "affectedData": [
        {
          "vendor": "Apache Software Foundation",
          "product": "Apache Subversion",
          "versions": [
            {
              "status": "unaffected",
              "version": "mod_authz_svn 1.10.7"
            },
            {
              "status": "affected",
              "version": "mod_authz_svn",
              "lessThan": "1.14.1",
              "versionType": "custom"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-03-17T10:15:11.873",
  "references": [
    {
      "url": "https://lists.debian.org/debian-lts-announce/2021/05/msg00000.html",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "source": "security@apache.org"
    },
    {
      "url": "https://subversion.apache.org/security/CVE-2020-17525-advisory.txt",
      "tags": [
        "Exploit",
        "Patch",
        "Vendor Advisory"
      ],
      "source": "security@apache.org"
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2021/05/msg00000.html",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://subversion.apache.org/security/CVE-2020-17525-advisory.txt",
      "tags": [
        "Exploit",
        "Patch",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security@apache.org",
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Subversion's mod_authz_svn module will crash if the server is using in-repository authz rules with the AuthzSVNReposRelativeAccessFile option and a client sends a request for a non-existing repository URL. This can lead to disruption for users of the service. This issue was fixed in mod_dav_svn+mod_authz_svn servers 1.14.1 and mod_dav_svn+mod_authz_svn servers 1.10.7"
    },
    {
      "lang": "es",
      "value": "El módulo mod_authz_svn de Subversion se bloqueará si el servidor está usando reglas de autenticación en el repositorio con la opción AuthzSVNReposRelativeAccessFile y un cliente envía una petición para una URL de repositorio no existente. Esto puede causar interrupciones para los usuarios del servicio. Este problema se solucionó en los servidores mod_dav_svn+mod_authz_svn versión 1.14.1 y los servidores mod_dav_svn+mod_authz_svn versión 1.10.7"
    }
  ],
  "lastModified": "2026-06-17T02:59:04.870",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
              "matchCriteriaId": "693F5DB8-76CC-4A99-B83D-DAA6CF9A207E",
              "versionEndExcluding": "1.10.7",
              "versionStartIncluding": "1.9.0"
            },
            {
              "criteria": "cpe:2.3:a:apache:subversion:*:*:*:*:*:*:*:*",
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              "matchCriteriaId": "AE489C7C-7BF8-40DC-83F1-95BF531ACDE7",
              "versionEndExcluding": "1.14.1",
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      "nodes": [
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          "cpeMatch": [
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              "vulnerable": true,
              "matchCriteriaId": "DEECE5FC-CACF-4496-A3E7-164736409252"
            }
          ],
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  "sourceIdentifier": "security@apache.org"
}