CVE-2026-25075
strongSwan 4.5.0 < 6.0.5 EAP-TTLS AVP Parsing Integer Underflow
CVE-2026-25075 is fixed in 26 products on 1 platform, first by DSA-6176-1, released March 23, 2026. It is not reported as exploited. Patch Radar priority: High.
High
CVSS
7.5
Important
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0105
64th percentile
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| charon-cmd · Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.5 | charon-cmd 5.9.5-2ubuntu2.5 | Apr 15, 2026 |
| charon-cmd · Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.2 | charon-cmd 5.9.13-2ubuntu4.24.04.2 | Apr 15, 2026 |
| charon-cmd · Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.2 | charon-cmd 6.0.1-6ubuntu4.2 | Apr 15, 2026 |
| charon-systemd · Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.5 | charon-systemd 5.9.5-2ubuntu2.5 | Apr 15, 2026 |
| charon-systemd · Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.2 | charon-systemd 5.9.13-2ubuntu4.24.04.2 | Apr 15, 2026 |
| charon-systemd · Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.2 | charon-systemd 6.0.1-6ubuntu4.2 | Apr 15, 2026 |
| libcharon-extauth-plugins · Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.5 | libcharon-extauth-plugins 5.9.5-2ubuntu2.5 | Apr 15, 2026 |
| libcharon-extauth-plugins · Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.2 | libcharon-extauth-plugins 5.9.13-2ubuntu4.24.04.2 | Apr 15, 2026 |
| libcharon-extauth-plugins · Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.2 | libcharon-extauth-plugins 6.0.1-6ubuntu4.2 | Apr 15, 2026 |
| libcharon-extra-plugins · Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.5 | libcharon-extra-plugins 5.9.5-2ubuntu2.5 | Apr 15, 2026 |
| libcharon-extra-plugins · Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.2 | libcharon-extra-plugins 5.9.13-2ubuntu4.24.04.2 | Apr 15, 2026 |
| libcharon-extra-plugins · Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.2 | libcharon-extra-plugins 6.0.1-6ubuntu4.2 | Apr 15, 2026 |
| libstrongswan · Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.5 | libstrongswan 5.9.5-2ubuntu2.5 | Apr 15, 2026 |
| libstrongswan · Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.2 | libstrongswan 5.9.13-2ubuntu4.24.04.2 | Apr 15, 2026 |
| libstrongswan · Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.2 | libstrongswan 6.0.1-6ubuntu4.2 | Apr 15, 2026 |
| libstrongswan-extra-plugins · Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.5 | libstrongswan-extra-plugins 5.9.5-2ubuntu2.5 | Apr 15, 2026 |
| libstrongswan-extra-plugins · Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.2 | libstrongswan-extra-plugins 5.9.13-2ubuntu4.24.04.2 | Apr 15, 2026 |
| libstrongswan-extra-plugins · Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.2 | libstrongswan-extra-plugins 6.0.1-6ubuntu4.2 | Apr 15, 2026 |
| libstrongswan-standard-plugins · Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.5 | libstrongswan-standard-plugins 5.9.5-2ubuntu2.5 | Apr 15, 2026 |
| libstrongswan-standard-plugins · Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.2 | libstrongswan-standard-plugins 5.9.13-2ubuntu4.24.04.2 | Apr 15, 2026 |
| libstrongswan-standard-plugins · Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.2 | libstrongswan-standard-plugins 6.0.1-6ubuntu4.2 | Apr 15, 2026 |
| perl-vici · Fedora 43 | 6.0.7-2.fc43 | FEDORA-2026-67A9805962 | Jun 16, 2026 |
| strongswan · Debian 11.6 (bullseye) | 5.9.1-1+deb11u6 | DLA-4512-1 | Mar 27, 2026 |
| strongswan · Debian 12.15 (bookworm) | 5.9.8-5+deb12u3 | DSA-6176-1 | Mar 23, 2026 |
| strongswan · Debian 13.5 (trixie) | 6.0.1-6+deb13u4 | DSA-6176-1 | Mar 23, 2026 |
| strongswan · Debian 14 | 6.0.5-1 | DEBIAN-CVE-2026-25075 | Mar 23, 2026 |
| strongswan · Fedora 43 | 6.0.7-2.fc43 | FEDORA-2026-67A9805962 | Jun 16, 2026 |
| strongswan · Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.5 | strongswan 5.9.5-2ubuntu2.5 | Apr 15, 2026 |
| strongswan · Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.2 | strongswan 5.9.13-2ubuntu4.24.04.2 | Apr 15, 2026 |
| strongswan · Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.2 | strongswan 6.0.1-6ubuntu4.2 | Apr 15, 2026 |
| strongswan · opensuse-leap 15.6 | 5.9.12-150600.3.11.1 | SUSE-SU-2026:0979-1 | Mar 23, 2026 |
| strongswan · opensuse-leap 16.0 | 6.0.4-160000.1.1 | OPENSUSE-SU-2026:20547-1 | Apr 16, 2026 |
| strongswan · sles 15.6 | 5.9.12-150600.3.11.1 | SUSE-SU-2026:0979-1 | Mar 23, 2026 |
| strongswan · sles 15.7 | 5.9.14-150700.3.9.1 | SUSE-SU-2026:0980-1 | Mar 23, 2026 |
| strongswan · sles 16.0 | 6.0.4-160000.1.1 | SUSE-SU-2026:21203-1 | Apr 16, 2026 |
| strongswan-charon · Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.5 | strongswan-charon 5.9.5-2ubuntu2.5 | Apr 15, 2026 |
| strongswan-charon · Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.2 | strongswan-charon 5.9.13-2ubuntu4.24.04.2 | Apr 15, 2026 |
| strongswan-charon · Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.2 | strongswan-charon 6.0.1-6ubuntu4.2 | Apr 15, 2026 |
| strongswan-charon-nm · Fedora 43 | 6.0.7-2.fc43 | FEDORA-2026-67A9805962 | Jun 16, 2026 |
| strongswan-charon-nm-debuginfo · Fedora 43 | 6.0.7-2.fc43 | FEDORA-2026-67A9805962 | Jun 16, 2026 |
| strongswan-debuginfo · Fedora 43 | 6.0.7-2.fc43 | FEDORA-2026-67A9805962 | Jun 16, 2026 |
| strongswan-debugsource · Fedora 43 | 6.0.7-2.fc43 | FEDORA-2026-67A9805962 | Jun 16, 2026 |
| strongswan-libcharon · Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.5 | strongswan-libcharon 5.9.5-2ubuntu2.5 | Apr 15, 2026 |
| strongswan-libcharon · Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.2 | strongswan-libcharon 5.9.13-2ubuntu4.24.04.2 | Apr 15, 2026 |
| strongswan-libcharon · Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.2 | strongswan-libcharon 6.0.1-6ubuntu4.2 | Apr 15, 2026 |
| strongswan-libipsec · Fedora 43 | 6.0.7-2.fc43 | FEDORA-2026-67A9805962 | Jun 16, 2026 |
| strongswan-libipsec-debuginfo · Fedora 43 | 6.0.7-2.fc43 | FEDORA-2026-67A9805962 | Jun 16, 2026 |
| strongswan-nm · Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.5 | strongswan-nm 5.9.5-2ubuntu2.5 | Apr 15, 2026 |
| strongswan-nm · Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.2 | strongswan-nm 5.9.13-2ubuntu4.24.04.2 | Apr 15, 2026 |
| strongswan-nm · Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.2 | strongswan-nm 6.0.1-6ubuntu4.2 | Apr 15, 2026 |
| strongswan-pki · Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.5 | strongswan-pki 5.9.5-2ubuntu2.5 | Apr 15, 2026 |
| strongswan-pki · Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.2 | strongswan-pki 5.9.13-2ubuntu4.24.04.2 | Apr 15, 2026 |
| strongswan-pki · Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.2 | strongswan-pki 6.0.1-6ubuntu4.2 | Apr 15, 2026 |
| strongswan-scepclient · Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.5 | strongswan-scepclient 5.9.5-2ubuntu2.5 | Apr 15, 2026 |
| strongswan-sqlite · Fedora 43 | 6.0.7-2.fc43 | FEDORA-2026-67A9805962 | Jun 16, 2026 |
| strongswan-sqlite-debuginfo · Fedora 43 | 6.0.7-2.fc43 | FEDORA-2026-67A9805962 | Jun 16, 2026 |
| strongswan-starter · Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.5 | strongswan-starter 5.9.5-2ubuntu2.5 | Apr 15, 2026 |
| strongswan-starter · Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.2 | strongswan-starter 5.9.13-2ubuntu4.24.04.2 | Apr 15, 2026 |
| strongswan-starter · Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.2 | strongswan-starter 6.0.1-6ubuntu4.2 | Apr 15, 2026 |
| strongswan-swanctl · Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.5 | strongswan-swanctl 5.9.5-2ubuntu2.5 | Apr 15, 2026 |
| strongswan-swanctl · Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.2 | strongswan-swanctl 5.9.13-2ubuntu4.24.04.2 | Apr 15, 2026 |
| strongswan-swanctl · Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.2 | strongswan-swanctl 6.0.1-6ubuntu4.2 | Apr 15, 2026 |
| strongswan-tnc-imcvs · Fedora 43 | 6.0.7-2.fc43 | FEDORA-2026-67A9805962 | Jun 16, 2026 |
| strongswan-tnc-imcvs-debuginfo · Fedora 43 | 6.0.7-2.fc43 | FEDORA-2026-67A9805962 | Jun 16, 2026 |
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