This page tracks the Ubuntu fix status. The vulnerability itself is described on the main CVE page.
View CVE-2026-25075 →
UBUNTU-CVE-2026-25075
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 atta...
Original description
The description as published by the source.
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.
Source: OSV.dev (Open Source Vulnerabilities) OSV
Affected packages
Ubuntu:Pro:14.04:LTS
strongswan
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:16.04:LTS
strongswan
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:FIPS-updates:16.04:LTS
strongswan
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:FIPS:16.04:LTS
strongswan
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:18.04:LTS
strongswan
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:FIPS-updates:18.04:LTS
strongswan
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:FIPS:18.04:LTS
strongswan
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:20.04:LTS
strongswan
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:FIPS-updates:20.04:LTS
strongswan
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:FIPS:20.04:LTS
strongswan
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:22.04:LTS
strongswan
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.9.5-2ubuntu2.5"}]}]
Ubuntu:Pro:FIPS-preview:22.04:LTS
strongswan
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:FIPS-updates:22.04:LTS
strongswan
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.9.5-2ubuntu2.5+Fips1"}]}]
Ubuntu:24.04:LTS
strongswan
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.9.13-2ubuntu4.24.04.2"}]}]
Ubuntu:25.10
strongswan
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.1-6ubuntu4.2"}]}]
References
- advisory ubuntu.com
- report ubuntu.com
- report cve.org