CVSS 4.0
8.7 highCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:NCVE-2026-25075
High (8.7). EPSS 1.1% chance of exploitation in the next 30 days.
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.
Severity
CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- EPSS
- 1.1% chance of exploitation in the next 30 days; higher than 64% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-191, CWE-476
- Published
- Modified
- Record from
- the NVD, synced
References
- https://www.strongswan.org/blog/2026/03/23/strongswan-6.0.5-released.html
- https://www.strongswan.org/blog/2026/03/23/strongswan-vulnerability-(cve-2026-25075).html
- https://www.vulncheck.com/advisories/strongswan-eap-ttls-avp-parsing-integer-underflow
- https://y637f9qq2x.com/posts/cve-2026-25075/
- https://lists.debian.org/debian-lts-announce/2026/03/msg00016.html