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CVE-2025-23016

FastCGI fcgi2 (aka fcgi) 2.x through 2.4.4 has an integer overflow (and resultant heap-based...

9.3 CriticalFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.61%Up 0.6 points since Jan 11, 2025
90%50%10%1%

What each source reports

CVE List Score used 9.3

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.

Record
CVE-2025-23016
CVSS 3.1
9.3 CriticalCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness
CWE-190
Updated
2026-11-02
EUVDEUVD-2025-3075 9.3

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.

Record
EUVD-2025-3075
CVSS 3.1
9.3 CriticalCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-9825-56cx-cfg6 9.3

FastCGI fcgi2 (aka fcgi) 2.x through 2.4.4 has an integer overflow (and resultant heap-based...

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.

Record
GHSA-9825-56cx-cfg6
CVSS 3.1
9.3 CriticalCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness
CWE-190
Updated
2026-11-02
NVD 9.3

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.

Record
CVE-2025-23016
CVSS 3.1
9.3 CriticalCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness
CWE-190
Updated
2026-11-02
OSVBELL-CVE-2025-23016 9.3
Record
BELL-CVE-2025-23016
CVSS 3.1
9.3 CriticalCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Updated
2026-11-02
OSV 9.3

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.

Record
CVE-2025-23016
CVSS 3.1
9.3 CriticalCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness
CWE-190
Updated
2026-11-02
Show 11 moreShow less
OSVDEBIAN-CVE-2025-23016 9.3

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.

Record
DEBIAN-CVE-2025-23016
CVSS 3.1
9.3 CriticalCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Updated
2026-11-02
OSVOESA-2025-1475 9.3

fcgi security update

FastCGI is a language independent, scalable, open extension to CGI that provides high performance without the limitations of server specific APIs.

Security Fix(es):

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.(CVE-2025-23016)

Record
OESA-2025-1475
CVSS 3.1
9.3 CriticalCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Updated
2026-11-02
OSVOESA-2025-2779 9.3

fcgi security update

FastCGI is a language independent, scalable, open extension to CGI that provides high performance without the limitations of server specific APIs.

Security Fix(es):

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.(CVE-2025-23016)

Record
OESA-2025-2779
CVSS 3.1
9.3 CriticalCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2025-23016 9.3

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.

Record
UBUNTU-CVE-2025-23016
CVSS 3.1
9.3 CriticalCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Updated
2026-11-02
OSVAZL-55397 No score

CVE-2025-23016 affecting package fcgi for versions less than 2.4.5-1

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.

Record
AZL-55397
Updated
2026-11-02
OSVAZL-55443 No score

CVE-2025-23016 affecting package fcgi for versions less than 2.4.5-1

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.

Record
AZL-55443
Updated
2026-11-02
OSVMGASA-2025-0144 No score

Updated fcgi packages fix security vulnerability

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. (CVE-2025-23016)

Record
MGASA-2025-0144
Updated
2026-11-02
OSVopenSUSE-SU-2025:15348-1 No score

FastCGI-2.4.6-1.1 on GA media

These are all security issues fixed in the FastCGI-2.4.6-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2025:15348-1
Updated
2026-11-02
OSVSUSE-SU-2025:02369-1 No score

Security update for FastCGI

This update for FastCGI fixes the following issues:

  • CVE-2025-23016: Fixed integer overflow in FastCGI fcgi2 library (bsc#1243325)
Record
SUSE-SU-2025:02369-1
Updated
2026-11-02
OSVSUSE-SU-2025:02372-1 No score

Security update for FastCGI

This update for FastCGI fixes the following issues:

  • CVE-2025-23016: Fixed integer overflow in FastCGI fcgi2 library (bsc#1243325)
Record
SUSE-SU-2025:02372-1
Updated
2026-11-02
OSVUSN-7486-1 No score

libfcgi vulnerability

It was discovered that FastCGI incorrectly handled certain inputs. An attacker could possibly use this issue to cause a crash or execute arbitrary code.

Record
USN-7486-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
fcgi
Azure Linux:2
 before 2.4.5-1
2.4.5-1
fcgi
Azure Linux:3
 before 2.4.5-1
2.4.5-1
fcgi
Alpaquita:23
 2.4.2-r1 and later None known
fcgi
Alpaquita:stream
 2.4.2-r1 up to 2.4.6-r0
2.4.6-r0
libfcgi
Debian:12
 before 2.4.2-2+deb12u1, plus listed versions
2.4.2-2
2.4.2-2+deb12u1
libfcgi
Debian:13
 before 2.4.5-0.1
2.4.5-0.1
libfcgi
Debian:14
 before 2.4.5-0.1
2.4.5-0.1
libfcgi
Debian:11
 before 2.4.2-2+deb11u1, plus listed versions
2.4.2-2
2.4.2-2+deb11u1
fcgi
Mageia:9
 before 2.4.0-22.1.mga9
2.4.0-22.1.mga9
fcgi
openEuler:20.03-LTS-SP4
 before 2.4.2-2.oe2003sp4
2.4.2-2.oe2003sp4
Show 29 moreShow less
Affected packages
PackageAffectedFixed
fcgi
openEuler:22.03-LTS-SP3
 before 2.4.2-2.oe2203sp3
2.4.2-2.oe2203sp3
fcgi
openEuler:22.03-LTS-SP4
 before 2.4.2-2.oe2203sp4
2.4.2-2.oe2203sp4
fcgi
openEuler:24.03-LTS
 before 2.4.2-2.oe2403sp1
2.4.2-2.oe2403sp1
fcgi
openEuler:24.03-LTS-SP1
 before 2.4.2-2.oe2403sp1
2.4.2-2.oe2403sp1
fcgi
openEuler:24.03-LTS-SP2
 before 2.4.2-3.oe2403sp2
2.4.2-3.oe2403sp2
FastCGI
SUSE:Linux Enterprise Server 12 SP5-LTSS
 before 2.4.0-169.3.1
2.4.0-169.3.1
FastCGI
SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5
 before 2.4.0-169.3.1
2.4.0-169.3.1
FastCGI
SUSE:Linux Enterprise Module for Development Tools 15 SP6
 before 2.4.0-150000.4.3.1
2.4.0-150000.4.3.1
FastCGI
SUSE:Linux Enterprise Module for Development Tools 15 SP7
 before 2.4.0-150000.4.3.1
2.4.0-150000.4.3.1
FastCGI
SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS
 before 2.4.0-150000.4.3.1
2.4.0-150000.4.3.1
FastCGI
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS
 before 2.4.0-150000.4.3.1
2.4.0-150000.4.3.1
FastCGI
SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS
 before 2.4.0-150000.4.3.1
2.4.0-150000.4.3.1
FastCGI
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS
 before 2.4.0-150000.4.3.1
2.4.0-150000.4.3.1
FastCGI
SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS
 before 2.4.0-150000.4.3.1
2.4.0-150000.4.3.1
FastCGI
SUSE:Linux Enterprise Server 15 SP3-LTSS
 before 2.4.0-150000.4.3.1
2.4.0-150000.4.3.1
FastCGI
SUSE:Linux Enterprise Server 15 SP4-LTSS
 before 2.4.0-150000.4.3.1
2.4.0-150000.4.3.1
FastCGI
SUSE:Linux Enterprise Server 15 SP5-LTSS
 before 2.4.0-150000.4.3.1
2.4.0-150000.4.3.1
FastCGI
SUSE:Linux Enterprise Server for SAP Applications 15 SP3
 before 2.4.0-150000.4.3.1
2.4.0-150000.4.3.1
FastCGI
SUSE:Linux Enterprise Server for SAP Applications 15 SP4
 before 2.4.0-150000.4.3.1
2.4.0-150000.4.3.1
FastCGI
SUSE:Linux Enterprise Server for SAP Applications 15 SP5
 before 2.4.0-150000.4.3.1
2.4.0-150000.4.3.1
FastCGI
SUSE:Enterprise Storage 7.1
 before 2.4.0-150000.4.3.1
2.4.0-150000.4.3.1
FastCGI
openSUSE:Leap 15.6
 before 2.4.0-150000.4.3.1
2.4.0-150000.4.3.1
libfcgi
Ubuntu:16.04:LTS
 All versions, plus listed versions
2.4.0-8.3
 None known
libfcgi
Ubuntu:18.04:LTS
 All versions, plus listed versions
2.4.0-8.42.4.0-10
 None known
libfcgi
Ubuntu:20.04:LTS
 All versions, plus listed versions
2.4.0-102.4.0-10build1
 None known
libfcgi
Ubuntu:22.04:LTS
 before 2.4.2-2ubuntu0.1, plus listed versions
2.4.2-2build12.4.2-2build2
2.4.2-2ubuntu0.1
libfcgi
Ubuntu:24.04:LTS
 before 2.4.2-2.1ubuntu0.24.04.1, plus listed versions
2.4.2-2build22.4.2-2.12.4.2-2.1build1
2.4.2-2.1ubuntu0.24.04.1
libfcgi
Ubuntu:25.10
 before 2.4.5-0.1, plus listed versions
2.4.2-2.1build1
2.4.5-0.1
FastCGI
openSUSE:Tumbleweed
 before 2.4.6-1.1
2.4.6-1.1

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2025-23016 is a critical vulnerability (CVSS 9.3) in Fastcgi Fcgi, published January 10, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.61%, the 49th percentile. Fixed in fcgi 2.4.5-1.

References

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