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CVE-2026-33337

Firebird has a buffer overflow when parsing corrupted slice packets

Published: Apr 17, 2026Updated: Apr 17, 2026 Sources: CVE List NVD
NVD MITRE
7.5CVSS
HIGH

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.

EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High

Weaknesses

CWE-120CWE-502

Affected Products

firebird
FirebirdSQL

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

4 techniques
Execution
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-89mq-229g-x47p
github.com
https://github.com/FirebirdSQL/firebird/releases/tag/v3.0.14
github.com
https://github.com/FirebirdSQL/firebird/releases/tag/v4.0.7
github.com
and 1 more references View all →

Timeline

Published
Apr 17, 2026
Last Updated
Apr 17, 2026

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