What’s Vulnerable › Vulnerabilities

CVE-2025-54989: Firebird XDR Message Parsing NULL Pointer Dereference Denial-of-Service Vulnerability

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-08-15 · updated 2026-06-17
• Weakness: CWE-476

Description

Firebird is a relational database. Prior to versions 3.0.13, 4.0.6, and 5.0.3, there is an XDR message parsing NULL pointer dereference denial-of-service vulnerability in Firebird. This specific flaw exists within the parsing of xdr message from client. It leads to NULL pointer dereference and DoS. This issue has been patched in versions 3.0.13, 4.0.6, and 5.0.3.

Affected products

• FirebirdSQL firebird: before 3.0.13; from 4.0.0 before 4.0.6; from 5.0.0 before 5.0.3 — fixed in 3.0.13, 4.0.6, 5.0.3

How to fix

Upgrade to a fixed version: FirebirdSQL firebird 3.0.13, 4.0.6, 5.0.3. Check the vendor advisory for mitigations.

References

• https://github.com/FirebirdSQL/firebird/commit/169da595f8693fc1a65a79c741724b1bc8db9f25
• https://github.com/FirebirdSQL/firebird/issues/8554
• https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-7qp6-hqxj-pjjp
• https://lists.debian.org/debian-lts-announce/2025/08/msg00021.html

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