FKIE_CVE-2026-33337

Vulnerability from fkie_nvd - Published: 2026-04-17 19:16 - Updated: 2026-04-27 14:26
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, when deserializing a slice packet, the xdr_datum() function does not validate that a cstring length conforms to the slice descriptor bounds, allowing a cstring longer than the allocated buffer to overflow it. An unauthenticated attacker can exploit this by sending a crafted packet to the server, potentially causing a crash or other security impact. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.
References
security-advisories@github.comhttps://github.com/FirebirdSQL/firebird/releases/tag/v3.0.14Release Notes
security-advisories@github.comhttps://github.com/FirebirdSQL/firebird/releases/tag/v4.0.7Release Notes
security-advisories@github.comhttps://github.com/FirebirdSQL/firebird/releases/tag/v5.0.4Release Notes
security-advisories@github.comhttps://github.com/FirebirdSQL/firebird/security/advisories/GHSA-89mq-229g-x47pExploit, Vendor Advisory
Impacted products
Vendor Product Version
firebirdsql firebird *
firebirdsql firebird *
firebirdsql firebird *
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:firebirdsql:firebird:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "9A79C5C5-09BC-4F38-8B00-F643818CC87D",
              "versionEndExcluding": "3.0.14",
              "versionStartIncluding": "3.0.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:firebirdsql:firebird:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "A4BC24D2-FBF7-4308-9914-6079DBDF88FA",
              "versionEndExcluding": "4.0.7",
              "versionStartIncluding": "4.0.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:firebirdsql:firebird:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "938978A3-90BE-4223-BDFC-5310A7C78D9B",
              "versionEndExcluding": "5.0.4",
              "versionStartIncluding": "5.0.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, when deserializing a slice packet, the xdr_datum() function does not validate that a cstring length conforms to the slice descriptor bounds, allowing a cstring longer than the allocated buffer to overflow it. An unauthenticated attacker can exploit this by sending a crafted packet to the server, potentially causing a crash or other security impact. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14."
    }
  ],
  "id": "CVE-2026-33337",
  "lastModified": "2026-04-27T14:26:16.380",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-04-17T19:16:36.223",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/FirebirdSQL/firebird/releases/tag/v3.0.14"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/FirebirdSQL/firebird/releases/tag/v4.0.7"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/FirebirdSQL/firebird/releases/tag/v5.0.4"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-89mq-229g-x47p"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-120"
        },
        {
          "lang": "en",
          "value": "CWE-502"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}


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