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VulnerabilityPublished Updated

CVE-2025-24975: FirebirdSQL firebird · Unchecked Error Condition

Affects FirebirdSQL firebirdSource CVE Database V5

0

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

CVSS 3.1 base score
7.1High
How severe the flaw is on the 0–10 CVSS scale.
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:L

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 15 Aug 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
FirebirdSQL firebirdAffected
  • <6.0.0.609
  • <5.0.2.1610
  • <4.0.6.3183
Fixed in
  • 6.0.0.609
  • 5.0.2.1610
  • 4.0.6.3183

AI-suggested

  1. Immediately upgrade FirebirdSQL to versions 4.0.6.3183, 5.0.2.1610, 6.0.0.609 or later where the vulnerability is patched.
  2. As an interim workaround, set ExtConnPoolSize=0 in firebird.conf to disable the external connection pool feature, preventing the vulnerability from being triggered.
  3. Audit database configurations and usage of execute statements on external databases to minimize complex chaining that could be exploited.
  4. Restrict network exposure of FirebirdSQL servers to trusted internal networks and implement strict access controls to limit potential attackers.
  5. Monitor FirebirdSQL server logs for unusual crashes or segfaults that could indicate exploitation attempts.
  6. Conduct a thorough review of encrypted database access controls and cryptographic key management to ensure no unauthorized access is possible.
  7. 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

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