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CVE-2020-5283

Estado: ModificadaBaja (3.5)—

ViewVC versiones anteriores a 1.1.28 y 1.2.1, presenta una vulnerabilidad de tipo XSS en el soporte show_subdir_lastmod de CVS. El impacto de esta vulnerabilidad está mitigado mediante la necesidad de que un atacante tenga privilegios de commit en un repositorio CVS expuesto por una instancia de ViewVC confiable que también tenga la funcionalidad "show_subdir_lastmod" habilitada. El vector de ataque involucra archivos con nombres no seguros (nombres que, cuando se insertan en una secuencia de datos HTML, causarían que el navegador ejecute un código no deseado), que pueden ser en si mismos difíciles de crear. Esta vulnerabilidad está parcheada en las versiones 1.2.1 y 1.1.28.

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Fuente: mapeo oficial MITRE CTID (CVE → ATT&CK).

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

User TrainingUser Account ManagementRestrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationExecution Prevention

Tecnologías afectadas (1)

Viewvc — Viewvc

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2020-5283",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 2.1,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:H/Au:S/C:N/I:P/A:N",
          "authentication": "SINGLE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "LOW",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 3.9,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
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    "cvssMetricV31": [
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          "userInteraction": "REQUIRED",
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          "privilegesRequired": "HIGH",
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      {
        "type": "Primary",
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        "cvssData": {
          "scope": "UNCHANGED",
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          "baseScore": 3.5,
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          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "HIGH",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.5,
        "exploitabilityScore": 0.9
      }
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  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "viewvc",
          "product": "viewvc",
          "versions": [
            {
              "status": "affected",
              "version": "< 1.1.28"
            },
            {
              "status": "affected",
              "version": ">= 1.2.0, < 1.2.1"
            }
          ]
        }
      ]
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  ],
  "published": "2020-04-03T00:15:11.943",
  "references": [
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      "url": "https://github.com/viewvc/viewvc/commit/ad0f966e9a997b17d853a6972ea283d4dcd70fa8",
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      "tags": [
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        "Issue Tracking",
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    },
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      "source": "security-advisories@github.com"
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    {
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
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      "source": "security-advisories@github.com",
      "description": [
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          "lang": "en",
          "value": "CWE-80"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "ViewVC before versions 1.1.28 and 1.2.1 has a XSS vulnerability in CVS show_subdir_lastmod support. The impact of this vulnerability is mitigated by the need for an attacker to have commit privileges to a CVS repository exposed by an otherwise trusted ViewVC instance that also has the `show_subdir_lastmod` feature enabled. The attack vector involves files with unsafe names (names that, when embedded into an HTML stream, would cause the browser to run unwanted code), which themselves can be challenging to create. This vulnerability is patched in versions 1.2.1 and 1.1.28."
    },
    {
      "lang": "es",
      "value": "ViewVC versiones anteriores a 1.1.28 y 1.2.1, presenta una vulnerabilidad de tipo XSS en el soporte show_subdir_lastmod de CVS. El impacto de esta vulnerabilidad está mitigado mediante la necesidad de que un atacante tenga privilegios de commit en un repositorio CVS expuesto por una instancia de ViewVC confiable que también tenga la funcionalidad \"show_subdir_lastmod\" habilitada. El vector de ataque involucra archivos con nombres no seguros (nombres que, cuando se insertan en una secuencia de datos HTML, causarían que el navegador ejecute un código no deseado), que pueden ser en si mismos difíciles de crear. Esta vulnerabilidad está parcheada en las versiones 1.2.1 y 1.1.28."
    }
  ],
  "lastModified": "2026-06-17T03:21:11.940",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "criteria": "cpe:2.3:a:viewvc:viewvc:*:*:*:*:*:*:*:*",
              "vulnerable": true,
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              "versionEndExcluding": "1.1.28"
            },
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              "versionEndExcluding": "1.2.1",
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            }
          ],
          "operator": "OR"
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  "sourceIdentifier": "security-advisories@github.com"
}