CVE-2026-25075
Fixed in a distro release EPSS 1%CVSS 7.5
strongSwan versions 4.5.0 prior to 6.0.5 contain an integer underflow vulnerability in the EAP-TTLS AVP parser that allows unauthenticated remote attackers to cause a denial of service by sending crafted AVP data with invalid length fields during IKEv2 authentication. Attackers can exploit the failure to validate AVP length fields before subtraction to trigger excessive memory allocation or NULL pointer dereference, crashing the charon IKE daemon.
Products: strongswan
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Debian 11 | strongswan | 5.9.1-1+deb11u6 |
| Debian 12 | strongswan | 5.9.8-5+deb12u3 |
| Debian 13 | strongswan | 6.0.1-6+deb13u4 |
| Debian 14 | strongswan | 6.0.5-1 |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | strongswan | 5.9.11-150400.19.26.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | strongswan | 5.9.11-150400.19.26.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | strongswan | 5.9.11-150500.5.14.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | strongswan | 5.9.11-150500.5.14.1 |
| SUSE Linux Enterprise Module for Basesystem 15 SP7 | strongswan | 5.9.14-150700.3.9.1 |
| SUSE Linux Enterprise Module for Package Hub 15 SP7 | strongswan | 5.9.14-150700.3.9.1 |
| SUSE Linux Enterprise Server 12 SP5-LTSS | strongswan | 5.1.3-26.32.1 |
| SUSE Linux Enterprise Server 15 SP4-LTSS | strongswan | 5.9.11-150400.19.26.1 |
| SUSE Linux Enterprise Server 15 SP5-LTSS | strongswan | 5.9.11-150500.5.14.1 |
| SUSE Linux Enterprise Server 15 SP6-LTSS | strongswan | 5.9.12-150600.3.11.1 |
| SUSE Linux Enterprise Server 16.0 | strongswan | 6.0.4-160000.1.1 |
| SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 | strongswan | 5.1.3-26.32.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | strongswan | 5.9.11-150400.19.26.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | strongswan | 5.9.11-150500.5.14.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | strongswan | 5.9.12-150600.3.11.1 |
| SUSE Linux Enterprise Server for SAP applications 16.0 | strongswan | 6.0.4-160000.1.1 |
| SUSE Linux Enterprise Workstation Extension 15 SP7 | strongswan | 5.9.14-150700.3.9.1 |
| Ubuntu 20.04 LTS | strongswan | no fix |
| Ubuntu 22.04 LTS | strongswan | 5.9.5-2ubuntu2.5 |
| Ubuntu 24.04 LTS | strongswan | 5.9.13-2ubuntu4.24.04.2 |
| Ubuntu 25.10 | strongswan | 6.0.1-6ubuntu4.2 |
| Ubuntu Pro 14.04 LTS | strongswan | no fix |
| Ubuntu Pro 16.04 LTS | strongswan | no fix |
| Ubuntu Pro 18.04 LTS | strongswan | no fix |
| Ubuntu Pro FIPS-preview 22.04 LTS | strongswan | no fix |
| Ubuntu Pro FIPS-updates 16.04 LTS | strongswan | no fix |
| Ubuntu Pro FIPS-updates 18.04 LTS | strongswan | no fix |
| Ubuntu Pro FIPS-updates 20.04 LTS | strongswan | no fix |
| Ubuntu Pro FIPS-updates 22.04 LTS | strongswan | 5.9.5-2ubuntu2.5+Fips1 |
| Ubuntu Pro FIPS 16.04 LTS | strongswan | no fix |
| Ubuntu Pro FIPS 18.04 LTS | strongswan | no fix |
| Ubuntu Pro FIPS 20.04 LTS | strongswan | no fix |
| openSUSE Leap 15.6 | strongswan | 5.9.12-150600.3.11.1 |
| openSUSE Leap 16.0 | strongswan | 6.0.4-160000.1.1 |
| openSUSE Tumbleweed | strongswan | 6.0.5-1.1 |