# CVE-2023-23009: libreswan: Libreswan is an implementation of IPsec and IKE for Linux

CVE-2023-23009 is fixed in libreswan on 1 platform, first by DEBIAN-CVE-2023-23009, released February 21, 2023. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-23009
- Priority: Routine
- CVSS: 6.5 (Moderate)
- EPSS: 0.0161
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 21, 2023

## Description

Libreswan is an implementation of IPsec and IKE for Linux. IPsec is the Internet Protocol Security and uses strong cryptography to provide both authentication and encryption services. These services allow you to build secure tunnels through untrusted networks such as virtual private network (VPN).  Security Fix(es):  * libreswan: remote DoS via crafted TS payload with an incorrect selector length (CVE-2023-23009)  For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.  Bug Fix(es):  * authby=rsasig fails in FIPS policy (BZ#2187647)

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libreswan Debian 11.6 (bullseye) | 4.3-1+deb11u3 | [DSA-5368-1](https://patchblox.com/security/data/fix/linux/dsa-5368-1.md) | Mar 3, 2023 |
| Linux | libreswan Debian 12.15 (bookworm) | 4.9-2 | [DEBIAN-CVE-2023-23009](https://patchblox.com/security/data/fix/linux/debian-cve-2023-23009.md) | Feb 21, 2023 |
| Linux | libreswan Debian 13.5 (trixie) | 4.9-2 | [DEBIAN-CVE-2023-23009](https://patchblox.com/security/data/fix/linux/debian-cve-2023-23009.md) | Feb 21, 2023 |
| Linux | libreswan RHEL 8 | 0:4.9-2.el8_8.2 | [RHSA-2023:3095](https://patchblox.com/security/data/fix/linux/rhsa-2023-3095.md) | May 16, 2023 |
| Linux | libreswan RHEL 9 | 0:4.9-2.el9_2 | [RHSA-2023:2633](https://patchblox.com/security/data/fix/linux/rhsa-2023-2633.md) | May 9, 2023 |
| Linux | libreswan almalinux 8 | 4.9-2.el8_8.2 | [ALSA-2023:3095](https://patchblox.com/security/data/fix/linux/alsa-2023-3095.md) | May 16, 2023 |
| Linux | libreswan almalinux 9 | 4.9-2.el9_2 | [ALSA-2023:2633](https://patchblox.com/security/data/fix/linux/alsa-2023-2633.md) | May 9, 2023 |
| Linux | libreswan ol 8 | 0:4.9-2.0.1.el8_8.2 | [ELSA-2023-3095](https://patchblox.com/security/data/fix/linux/elsa-2023-3095.md) | May 24, 2023 |
| Linux | libreswan ol 9 | 0:4.9-2.0.1.el9_2 | [ELSA-2023-2633](https://patchblox.com/security/data/fix/linux/elsa-2023-2633.md) | May 17, 2023 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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