What is CVE-2025-24975?

CVE-2025-24975 is a high-severity vulnerability in Firebirdsql Firebird, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 7.1/10. Published 2025-08-15.

How severe is CVE-2025-24975?

High severity. CVSS v3 base score is 7.1 out of 10.

Is CVE-2025-24975 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Firebirdsql Firebird

CVE-2025-24975

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.

EPSS: 0.005 (42.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L.

Affected products

Firebirdsql Firebird — versions < 6.0.0.609, < 5.0.2.1610, < 4.0.6.3183

Weakness classification (CWE)

CWE-754 — Improper Check for Unusual or Exceptional Conditions

Public proof-of-concept exploits

References

security-advisories@github.com (x_refsource_CONFIRM, Mitigation, Vendor Advisory)
security-advisories@github.com (x_refsource_MISC, Issue Tracking)
security-advisories@github.com (Patch, x_refsource_MISC)
af854a3a-2127-422b-91ae-364da2661108 (Exploit, Third Party Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2025-24975?: CVE-2025-24975 is a high-severity vulnerability in Firebirdsql Firebird, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 7.1/10. Published 2025-08-15.
How severe is CVE-2025-24975?: High severity. CVSS v3 base score is 7.1 out of 10.
Is CVE-2025-24975 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.