Buffer overflow in Ether Fcgi
CVE-2025-40907
FCGI versions 0.44 through 0.82, for Perl, include a vulnerable version of the FastCGI fcgi2 (aka fcgi) library. The included FastCGI library is affected by CVE-2025-23016, causing an integer overflow (and resultant heap-based buffer ove…
Vulnerability class: Buffer Overflow
EPSS: 0.005 (39.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
Affected products
- Ether Fcgi — versions 0.44
- Fastcgi Fcgi
Weakness classification (CWE)
Public proof-of-concept exploits
References
- 9b29abf9-4ab0-4765-b253-1875cd9b441e (mailing-list, Mailing List, Third Party Advisory)
- 9b29abf9-4ab0-4765-b253-1875cd9b441e (issue-tracking, Exploit, Issue Tracking)
- 9b29abf9-4ab0-4765-b253-1875cd9b441e (Release Notes, patch)
- 9b29abf9-4ab0-4765-b253-1875cd9b441e (Exploit, technical-description, Third Party Advisory)
- 9b29abf9-4ab0-4765-b253-1875cd9b441e (issue-tracking, Exploit, Issue Tracking)
- 9b29abf9-4ab0-4765-b253-1875cd9b441e (Patch, patch)
Frequently asked questions
- What is CVE-2025-40907?
- CVE-2025-40907 is a medium-severity vulnerability in Ether Fcgi, classified under Heap-based Buffer Overflow. CVSS score: 5.3/10. Published 2025-05-16.
- How severe is CVE-2025-40907?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2025-40907 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.