NULL pointer dereference in Firebirdsql Firebird
CVE-2026-28224
Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, when the server receives an op_crypt_key_callback packet without prior authentication, the port_server_crypt_callback handler is not initialized, resulting in a null pointer dereference and server crash. An unauthenticated attacker who knows only the server's IP and port can exploit this to crash the server. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H.
EPSS exploit prediction
EPSS: 0.007 (53.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.007 · change: +0.003
Affected products
- Firebirdsql Firebird — versions >= 3.0.0, < 3.0.14, >= 4.0.0, < 4.0.7, >= 5.0.0, < 5.0.4
Weakness classification (CWE)
References
- github.com/FirebirdSQL/firebird/security/advisories/GHSA-xrcw-wpjx-pr95 (Exploit, Vendor Advisory)
- github.com/FirebirdSQL/firebird/releases/tag/v3.0.14 (Release Notes)
- github.com/FirebirdSQL/firebird/releases/tag/v4.0.7 (Release Notes)
- github.com/FirebirdSQL/firebird/releases/tag/v5.0.4 (Release Notes)
Frequently asked questions
- What is CVE-2026-28224?
- CVE-2026-28224 is a high-severity vulnerability in Firebirdsql Firebird, classified under NULL Pointer Dereference. CVSS score: 8.2/10. Published 2026-04-17.
- How severe is CVE-2026-28224?
- High severity. CVSS v3 base score is 8.2 out of 10.