CVE-2026-25075
strongswan - security update
EPSS 0.25%
Description
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.
How to fix CVE-2026-25075
To remediate CVE-2026-25075, upgrade the affected package to a fixed version below.
- —upgrade to 5.9.1-1+deb11u6 or later
- —upgrade to 5.9.1-1+deb11u6 or later
- —upgrade to 5.9.8-5+deb12u3 or later
Is CVE-2026-25075 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- from 0, < 5.9.1-1+deb11u6
- from 0, < 5.9.1-1+deb11u6
- from 0, < 5.9.8-5+deb12u3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |