# CVE-2025-23016: libfcgi-bin: FastCGI fcgi2 (aka fcgi) 2.x through 2.4.4 has an integer overflow (andresultant heap-based buffer overflow) via craf...

CVE-2025-23016 is fixed in 5 products on 1 platform, first by libfcgi-bin 2.4.2-2ubuntu0.1, released January 10, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-23016
- Priority: High
- CVSS: 9.3 (Medium)
- EPSS: 0.0061
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 10, 2025

## Description

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

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | FastCGI opensuse-leap 15.6 | 2.4.0-150000.4.3.1 | [SUSE-SU-2025:02372-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-02372-1.md) | Jul 18, 2025 |
| Linux | FastCGI sles 15.6 | 2.4.0-150000.4.3.1 | [SUSE-SU-2025:02372-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-02372-1.md) | Jul 18, 2025 |
| Linux | FastCGI sles 15.7 | 2.4.0-150000.4.3.1 | [SUSE-SU-2025:02372-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-02372-1.md) | Jul 18, 2025 |
| Linux | libfcgi Debian 11.6 (bullseye) | 2.4.2-2+deb11u1 | [DLA-4329-1](https://patchblox.com/security/data/fix/linux/dla-4329-1.md) | Oct 13, 2025 |
| Linux | libfcgi Debian 12.15 (bookworm) | 2.4.2-2+deb12u1 | [DEBIAN-CVE-2025-23016](https://patchblox.com/security/data/fix/linux/debian-cve-2025-23016.md) | Jan 10, 2025 |
| Linux | libfcgi Debian 13.5 (trixie) | 2.4.5-0.1 | [DEBIAN-CVE-2025-23016](https://patchblox.com/security/data/fix/linux/debian-cve-2025-23016.md) | Jan 10, 2025 |
| Linux | libfcgi Debian 14 | 2.4.5-0.1 | [DEBIAN-CVE-2025-23016](https://patchblox.com/security/data/fix/linux/debian-cve-2025-23016.md) | Jan 10, 2025 |
| Linux | libfcgi-bin Ubuntu 22.04.1 LTS (jammy) | 2.4.2-2ubuntu0.1 | [libfcgi-bin 2.4.2-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libfcgi-bin-2.4.2-2ubuntu0.1.md) | Jan 10, 2025 |
| Linux | libfcgi-bin Ubuntu 24.04.5 LTS (noble) | 2.4.2-2.1ubuntu0.24.04.1 | [libfcgi-bin 2.4.2-2.1ubuntu0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libfcgi-bin-2.4.2-2.1ubuntu0.24.04.1.md) | Jan 10, 2025 |
| Linux | libfcgi-bin Ubuntu 24.10 (oracular) | 2.4.2-2.1ubuntu0.24.10.1 | [libfcgi-bin 2.4.2-2.1ubuntu0.24.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libfcgi-bin-2.4.2-2.1ubuntu0.24.10.1.md) | Jan 16, 2026 |
| Linux | libfcgi-bin Ubuntu 25.04 (plucky) | 2.4.2-2.1ubuntu0.25.04.1 | [libfcgi-bin 2.4.2-2.1ubuntu0.25.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libfcgi-bin-2.4.2-2.1ubuntu0.25.04.1.md) | Jan 16, 2026 |
| Linux | libfcgi-bin Ubuntu 25.10 (questing) | 2.4.5-0.1 | [libfcgi-bin 2.4.5-0.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libfcgi-bin-2.4.5-0.1.md) | Jan 10, 2025 |
| Linux | libfcgi0ldbl Ubuntu 22.04.1 LTS (jammy) | 2.4.2-2ubuntu0.1 | [libfcgi0ldbl 2.4.2-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libfcgi0ldbl-2.4.2-2ubuntu0.1.md) | Jan 10, 2025 |
| Linux | libfcgi0t64 Ubuntu 24.04.5 LTS (noble) | 2.4.2-2.1ubuntu0.24.04.1 | [libfcgi0t64 2.4.2-2.1ubuntu0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libfcgi0t64-2.4.2-2.1ubuntu0.24.04.1.md) | Jan 10, 2025 |
| Linux | libfcgi0t64 Ubuntu 24.10 (oracular) | 2.4.2-2.1ubuntu0.24.10.1 | [libfcgi0t64 2.4.2-2.1ubuntu0.24.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libfcgi0t64-2.4.2-2.1ubuntu0.24.10.1.md) | Jan 16, 2026 |
| Linux | libfcgi0t64 Ubuntu 25.04 (plucky) | 2.4.2-2.1ubuntu0.25.04.1 | [libfcgi0t64 2.4.2-2.1ubuntu0.25.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libfcgi0t64-2.4.2-2.1ubuntu0.25.04.1.md) | Jan 16, 2026 |
| Linux | libfcgi0t64 Ubuntu 25.10 (questing) | 2.4.5-0.1 | [libfcgi0t64 2.4.5-0.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libfcgi0t64-2.4.5-0.1.md) | Jan 10, 2025 |

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