Vulnerability Report

CVE-2026-33337

Title: Buffer Overflow in Firebird xdr_datum()

Memory Corruption

Proof Of Concept

No public PoC currently indexed for CVE-2026-33337.

CWE Category CWE-120
Published Date Apr 17, 2026
Modified Date Apr 27, 2026
Exploit Status Not Found
Score 7.5 CVSS v3.1
Exploit Probability (EPSS)
0.13%

Vulnerability Summary

CVE-2026-33337: 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.

Impacted Vendors

F
firebirdsql 1
F
firebird 1

Reference Links

https://github.com/FirebirdSQL/firebird/releases/tag/v3.0.14 https://github.com/FirebirdSQL/firebird/releases/tag/v4.0.7 https://github.com/FirebirdSQL/firebird/releases/tag/v5.0.4 https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-89mq-229g-x47p
CVSS v3.1
Source Entity [email protected]
Severity HIGH
7.5
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-33337 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity LOW
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Stack

No specific products linked.