Description
pluto in Libreswan before 4.11 allows a denial of service (responder SPI mishandling and daemon crash) via unauthenticated IKEv1 Aggressive Mode packets. The earliest affected version is 3.28.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 13 | libreswan | 4.11-1 | — |
| Debian 12 | libreswan | 4.10-2+deb12u1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | libreswan | No fix yet | — |
| Ubuntu 26.04 LTS | libreswan | No fix yet | — |
| Ubuntu 25.10 | libreswan | No fix yet | — |
| Ubuntu 24.04 LTS | libreswan | No fix yet | — |
| Ubuntu 22.04 LTS | libreswan | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | libreswan | No fix yet | — |
| Ubuntu 18.04 LTS | libreswan | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | libreswan | 4.6-3.el9_1.1 | RHSA-2023:2120 |
| RHEL 8 | libreswan | 4.5-1.el8_7.1 | RHSA-2023:2122 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.0 EUS | libreswan | 4.6-3.el9_0.1 | RHSA-2023:2121 |
| RHEL 8.6 EUS | libreswan | 4.5-1.el8_6.1 | RHSA-2023:2123 |
| RHEL 8.4 EUS | libreswan | 4.3-6.el8_4.1 | RHSA-2023:2125 |
| RHEL 8.2 TUS | libreswan | 3.29-7.el8_2.2 | RHSA-2023:2124 |
| RHEL 8.2 E4S | libreswan | 3.29-7.el8_2.2 | RHSA-2023:2124 |
| RHEL 8.2 AUS | libreswan | 3.29-7.el8_2.2 | RHSA-2023:2124 |
| RHEL 8.1 E4S | libreswan | 3.29-7.el8_1.2 | RHSA-2023:2126 |
| Red Hat OpenShift 4 | libreswan | 4.6-3.el9_0.3 | RHBA-2024:11565, RHBA-2024:11525, RHBA-2024:11505 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | libreswan | 4.9-4.el9_2 | ALSA-2023:3148 |
| AlmaLinux 8 | libreswan | 4.5-1.el8_7.1 | ALSA-2023:3107, ALSA-2023:2122 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.17 | libreswan | 4.9-r2 | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | libreswan | 4.15-1 | — |
| Azure Linux 2 (CBL-Mariner) | libreswan | 4.14-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | libreswan | 4.6-3.0.1.el9_1.1 | ELSA-2023-2120 |
| Oracle Linux 8 | libreswan | 4.5-1.0.1.el8_7.1 | ELSA-2023-2122 |
Advisories 16
- ALSA-2023:3148 Important: libreswan security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:3107 Important: libreswan security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:2122 Important: libreswan security update AlmaLinux Security Advisories · Oct 29, 2026
- RHBA-2024:11505 Red Hat Bug Fix Advisory: OpenShift Container Platform 4.16.28 packages and security update Red Hat Security Advisories (RHSA) · Jan 29, 2026
- RHBA-2024:11565 Red Hat Bug Fix Advisory: OpenShift Container Platform 4.15.42 packages update Red Hat Security Advisories (RHSA) · Jan 29, 2026
- RHBA-2024:11525 Red Hat Bug Fix Advisory: OpenShift Container Platform 4.17.10 packages and security update Red Hat Security Advisories (RHSA) · Jan 29, 2026
- RHSA-2023:2125 Red Hat Security Advisory: libreswan security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:2126 Red Hat Security Advisory: libreswan security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:2123 Red Hat Security Advisory: libreswan security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:2124 Red Hat Security Advisory: libreswan security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:2122 Red Hat Security Advisory: libreswan security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:2120 Red Hat Security Advisory: libreswan security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:2121 Red Hat Security Advisory: libreswan security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- WID-SEC-2023-1149 libreswan: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Apr 24, 2024
- ELSA-2023-2122 Important: libreswan security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 5, 2023
- ELSA-2023-2120 Important: libreswan security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · May 5, 2023