CVE-2025-24975: FirebirdSQL firebird · Unchecked Error Condition
Affects FirebirdSQL firebirdSource CVE Database V5
Not known to be exploited · CVSS 7.1 High · fixed in 6.0.0.609 : patch FirebirdSQL firebird soon.
Data as of 26 Oct 2026, 17:16 UTC
- EPSS
- 0.5% chance of exploitation in 30 days – higher than 46% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 6.0.0.609, 5.0.2.1610, 4.0.6.3183
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:LExploitation evidence
Disclosed: evidence found.
CVE published 15 Aug 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade FirebirdSQL firebird to 6.0.0.609, 5.0.2.1610 or 4.0.6.3183.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| FirebirdSQL firebird | Affected
| Fixed in
|
AI-suggested
- Immediately upgrade FirebirdSQL to versions 4.0.6.3183, 5.0.2.1610, 6.0.0.609 or later where the vulnerability is patched.
- As an interim workaround, set ExtConnPoolSize=0 in firebird.conf to disable the external connection pool feature, preventing the vulnerability from being triggered.
- Audit database configurations and usage of execute statements on external databases to minimize complex chaining that could be exploited.
- Restrict network exposure of FirebirdSQL servers to trusted internal networks and implement strict access controls to limit potential attackers.
- Monitor FirebirdSQL server logs for unusual crashes or segfaults that could indicate exploitation attempts.
- Conduct a thorough review of encrypted database access controls and cryptographic key management to ensure no unauthorized access is possible.
- Incorporate this vulnerability into incident response plans and ensure rapid patch deployment processes are in place for database infrastructure.
Description
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.
References
- github.com/FirebirdSQL/firebird/security/advisories/GHSA-fx9r-rj68-7p69 (opens in a new tab)
- github.com/FirebirdSQL/firebird/issues/8429 (opens in a new tab)
- github.com/FirebirdSQL/firebird/commit/658abd20449f72097fbbce57e8e6ae42ff837fb6 (opens in a new tab)
- vicarius.io/vsociety/posts/cve-2025-24975-detect-vulnerable-firebird (opens in a new tab)
- vicarius.io/vsociety/posts/cve-2025-24975-mitigate-firebird-vulnerability (opens in a new tab)