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CVE-2021-39935

Estado: AnalizadaAlta (7.5)⚠ Explotación activa

Se ha detectado un problema en GitLab CE/EE afectando a todas las versiones a partir de 10.5 anteriores a 14.3.6, todas las versiones a partir de 14.4 anteriores a 14.4.4, todas las versiones a partir de 14.5 anteriores a 14.5.2. Los usuarios externos no autorizados podían llevar a cabo ataques de tipo Server Side Requests por medio de la API de CI Lint

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).

CISA KEV — explotada activamente

🎯 Técnicas ATT&CK

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

AV:N sin autenticación (PR:N) permite explotación de API expuesta (CI Lint); SSRF (CWE-918) permite solicitudes no autorizadas a recursos internos; confidencialidad alta (C:H) indica lectura de datos internos.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Filter Network TrafficVulnerability ScanningSSL/TLS InspectionPrivileged Account ManagementNetwork SegmentationNetwork Intrusion Prevention

Tecnologías afectadas (1)

Gitlab — Gitlab

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-39935",
  "cveTags": [],
  "metrics": {
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        "ssvcData": {
          "id": "CVE-2021-39935",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "active"
            },
            {
              "automatable": "no"
            },
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              "technicalImpact": "partial"
            }
          ],
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          "timestamp": "2026-02-03T15:23:46.312568Z"
        }
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          "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N",
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          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
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    "cvssMetricV31": [
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        "cvssData": {
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          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N",
          "integrityImpact": "NONE",
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        },
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          "product": "GitLab",
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            },
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              "status": "affected",
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            },
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              "status": "affected",
              "version": ">=14.5, <14.5.2"
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  "published": "2021-12-13T16:15:09.367",
  "references": [
    {
      "url": "https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39935.json",
      "tags": [
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    },
    {
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      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    {
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-39935",
      "tags": [
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      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
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  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "source": "nvd@nist.gov",
      "description": [
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          "value": "CWE-918"
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      "description": [
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "An issue has been discovered in GitLab CE/EE affecting all versions starting from 10.5 before 14.3.6, all versions starting from 14.4 before 14.4.4, all versions starting from 14.5 before 14.5.2. Unauthorized external users could perform Server Side Requests via the CI Lint API"
    },
    {
      "lang": "es",
      "value": "Se ha detectado un problema en GitLab CE/EE afectando a todas las versiones a partir de 10.5 anteriores a 14.3.6, todas las versiones a partir de 14.4 anteriores a 14.4.4, todas las versiones a partir de 14.5 anteriores a 14.5.2. Los usuarios externos no autorizados podían llevar a cabo ataques de tipo Server Side Requests por medio de la API de CI Lint"
    }
  ],
  "lastModified": "2026-06-17T04:04:27.387",
  "cisaActionDue": "2026-02-24",
  "cisaExploitAdd": "2026-02-03",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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  "sourceIdentifier": "cve@gitlab.com",
  "cisaRequiredAction": "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.",
  "cisaVulnerabilityName": "GitLab Community and Enterprise Editions Server-Side Request Forgery (SSRF) Vulnerability"
}