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CVE-2021-35247

Estado: AnalizadaMedia (5.3)⚠ Explotación activa

Serv-U web login screen to LDAP authentication was allowing characters that were not sufficiently sanitized. SolarWinds has updated the input mechanism to perform additional validation and sanitization. Please Note: No downstream affect has been detected as the LDAP servers ignored improper characters. To insure proper input validation is completed in all environments. SolarWinds recommends scheduling an update to the latest version of Serv-U.

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/AC:L/PR:N permite explotación remota sin autenticación (T1190). La sanitización insuficiente en LDAP podría permitir manipulación de datos de autenticación (T1565.002).

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

Vulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkFilter Network TrafficEncrypt Sensitive Information

Tecnologías afectadas (1)

Solarwinds — Serv-u

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2021-35247",
  "cveTags": [],
  "metrics": {
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      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-35247",
          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "active"
            },
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            },
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            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-01-29T20:23:12.218612Z"
        }
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          "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
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        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
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      }
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    "cvssMetricV31": [
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        "type": "Secondary",
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        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
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          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
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          "userInteraction": "REQUIRED",
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          "confidentialityImpact": "NONE"
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        "exploitabilityScore": 2.8
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        },
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  },
  "affected": [
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      "affectedData": [
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          "product": "Serv-U",
          "versions": [
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              "lessThan": "15.3",
              "versionType": "custom"
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  "published": "2022-01-10T14:10:17.667",
  "references": [
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      "url": "https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-3_release_notes.htm",
      "tags": [
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    },
    {
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      "tags": [
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      "source": "psirt@solarwinds.com"
    },
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      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-35247",
      "tags": [
        "US Government Resource"
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
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  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "psirt@solarwinds.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        }
      ]
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    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "NVD-CWE-noinfo"
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Serv-U web login screen to LDAP authentication was allowing characters that were not sufficiently sanitized. SolarWinds has updated the input mechanism to perform additional validation and sanitization. Please Note: No downstream affect has been detected as the LDAP servers ignored improper characters. To insure proper input validation is completed in all environments. SolarWinds recommends scheduling an update to the latest version of Serv-U."
    },
    {
      "lang": "es",
      "value": "La pantalla de inicio de sesión web de Serv-U para la autenticación LDAP permitía caracteres que no estaban suficientemente desinfectados. SolarWinds ha actualizado el mecanismo de entrada para realizar una validación y sanitización adicionales. Nota: No se ha detectado ninguna afectación posterior, ya que los servidores LDAP ignoraban los caracteres inadecuados. Para asegurar que la validación de la entrada se completa en todos los entornos. SolarWinds recomienda programar una actualización a la última versión de Serv-U"
    }
  ],
  "lastModified": "2026-06-17T03:57:22.850",
  "cisaActionDue": "2022-02-04",
  "cisaExploitAdd": "2022-01-21",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "matchCriteriaId": "DB4EF8F3-F239-464D-B0AA-3119A5CCF12E",
              "versionEndExcluding": "15.3"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "psirt@solarwinds.com",
  "cisaRequiredAction": "Apply updates per vendor instructions.",
  "cisaVulnerabilityName": "SolarWinds Serv-U Improper Input Validation Vulnerability"
}