CRITICAL 9.3 Microsoft

CVE-2025-23016

FastCGI fcgi2 (aka fcgi) 2.x through 2.4.4 has an integer overflow (and resultant heap-based buffer overflow) via crafted nameLen or valueLen values in data to the IPC socket. This occurs in ReadParams in fcgiapp.c.

Microsoft Security Update 2025-Jan: FastCGI fcgi2 (aka fcgi) 2.x through 2.4.4 has an integer overflow (and resultant heap-based buffer overflow) via crafted nameLen or valueLen values in data to the IPC socket. This occurs in ReadParams in fcgiapp.c.

Affected Products

cbl2 fcgi 2.4.0-7 on CBL Mariner 2.0
azl3 fcgi 2.4.0-7 on Azure Linux 3.0
cbl2 fcgi 2.4.5-1 on CBL Mariner 2.0
azl3 fcgi 2.4.5-1 on Azure Linux 3.0

References

Published: 2025-01-14 · Source: Microsoft · Feed updated: 2026-08-11

This critical severity vulnerability with a CVSS score of 9.3 was published on 2025-01-14 via Microsoft. Affected: cbl2 fcgi 2.4.0-7 on CBL Mariner 2.0, azl3 fcgi 2.4.0-7 on Azure Linux 3.0, cbl2 fcgi 2.4.5-1 on CBL Mariner 2.0 and 1 more.

Risk Timeline

CVE Disclosed2025-01-14 · 574 days ago

Remediation Resources

Official Advisory

msrc.microsoft.com/update-guide/vulnerability/CVE-2025-23016

NVD / MITRE

nvd.nist.gov/vuln/detail/CVE-2025-23016

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