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CVE-2021-42770

Status: ModifiedMedium (6.1)—

A Cross-site scripting (XSS) vulnerability was discovered in OPNsense before 21.7.4 via the LDAP attribute return in the authentication tester.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

Opnsense — Opnsense

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2021-42770",
  "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:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 6.1,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.7,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-11-08T16:15:07.547",
  "references": [
    {
      "url": "https://cert.orange.com",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://github.com/orangecertcc/security-research/security/advisories/GHSA-r32j-xgg3-w2rw",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://opnsense.org/opnsense-21-7-4-released/",
      "tags": [
        "Release Notes",
        "Vendor Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://cert.orange.com",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://github.com/orangecertcc/security-research/security/advisories/GHSA-r32j-xgg3-w2rw",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://opnsense.org/opnsense-21-7-4-released/",
      "tags": [
        "Release Notes",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A Cross-site scripting (XSS) vulnerability was discovered in OPNsense before 21.7.4 via the LDAP attribute return in the authentication tester."
    },
    {
      "lang": "es",
      "value": "Se ha detectado una vulnerabilidad de tipo Cross-site scripting (XSS) en OPNsense versiones anteriores a 21.7.4, por medio de la devolución de atributos LDAP en el comprobador de autenticación"
    }
  ],
  "lastModified": "2026-06-17T04:10:06.810",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:opnsense:opnsense:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "BC6844D5-1C2A-480A-AE63-39399CD35BA3",
              "versionEndIncluding": "19.7.0"
            },
            {
              "criteria": "cpe:2.3:a:opnsense:opnsense:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "51004450-EC73-4E79-AA47-ABFF7DD145FC",
              "versionEndExcluding": "21.7.4",
              "versionStartIncluding": "21.7.0"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}