Firebird is a relational database. Prior to snapshot versions 4.0.6.3183, 5.0.2.1610, and 6.0.0.609, Firebird is vulnerable if ExtConnPoolSize is not set equal to 0. If connections stored in ExtConnPool are not verified for presence and suitability of the CryptCallback interface is used when created versus what is available could result in a segfault in the server process. Encrypted databases, accessed by execute statement on external, may be accessed later by an attachment missing a key to that database. In a case when execute statement are chained, segfault may happen. Additionally, the segfault may affect unencrypted databases. This issue has been patched in snapshot versions 4.0.6.3183, 5.0.2.1610, and 6.0.0.609 and point releases 4.0.6 and 5.0.2. A workaround for this issue involves setting ExtConnPoolSize equal to 0 in firebird.conf.
The product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product.
| Link | Tags |
|---|---|
| https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-fx9r-rj68-7p69 | mitigation vendor advisory |
| https://github.com/FirebirdSQL/firebird/issues/8429 | issue tracking |
| https://github.com/FirebirdSQL/firebird/commit/658abd20449f72097fbbce57e8e6ae42ff837fb6 | patch |
| https://www.vicarius.io/vsociety/posts/cve-2025-24975-detect-vulnerable-firebird | exploit third party advisory |
| https://www.vicarius.io/vsociety/posts/cve-2025-24975-mitigate-firebird-vulnerability | exploit third party advisory |