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CVE-2026-33337

Firebird has a buffer overflow when parsing corrupted slice packets

Published: Apr 17, 2026Updated: Apr 27, 2026 Sources: CVE List NVD BDUCWE-120
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.5%
Top 58.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

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.

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
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Weaknesses

CWE-120CWE-502

Affected Products

РЕД ОСООО «Ред Софт»
On-premOS
Operating Systems / linux-distro
Ред База ДанныхООО «Ред Софт»
On-premDatabase
Databases / relational
FirebirdFirebird Foundation Inc.
On-prem
Databases / relational
firebirdFirebirdSQL
On-prem
Databases / relational
firebirdfirebirdsql
On-prem
Databases / relational
ооо «ред софт»commercialRUOperating Systemsaka red soft
firebird foundation inc.oss-projectDatabasesaka firebird
firebirdsqloss-projectDatabasesaka firebird

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

4 techniques
Execution
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://github.com/FirebirdSQL/firebird/releases/tag/v3.0.14
github.com
https://github.com/FirebirdSQL/firebird/releases/tag/v4.0.7
github.com
https://github.com/FirebirdSQL/firebird/releases/tag/v5.0.4
github.com
and 3 more references View all →

Timeline

Published
Apr 17, 2026
Last Updated
Apr 27, 2026

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