CVE-2026-33337: high-severity vulnerability in FirebirdSQL firebird
Firebird has a buffer overflow when parsing corrupted slice packets
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.5%
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
FirebirdSQL · firebirdRelated CVEs — FirebirdSQL firebird
In the same product, most dangerous first.
CVE-2026-28214MEDIUMFirebird server hangs when using specific clumplet on batch creationEPSS 1.1%CVE-2026-40342CRITICALFirebird: Path Traversal + Arbitrary File Write Leads to Remote Code ExecutionEPSS 0.7%CVE-2025-54989MEDIUMFirebird XDR Message Parsing NULL Pointer Dereference Denial-of-Service VulnerabilityEPSS 0.7%CVE-2023-41038HIGHServer crash when using specific form of SET BIND statementEPSS 0.7%CVE-2025-24975HIGHFirebird Non-Authorized Access to Encrypted Database Using Execute Statement on ExternalEPSS 0.6%CVE-2026-28212HIGHFirebird has potential server crash via null pointer dereference when processing op_slice packetEPSS 0.5%