CVE-2026-25075

· HIGHDeferred

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CVSS v3.1

7.5

CVSS v4.0

8.7

EPSS

1.01%

Published

Mar 23, 2026

Modified

May 4, 2026

Public PoC / Exploit (1)

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Links to public security research (Exploit-DB, Nuclei, Trickest, GitHub) for defensive use only.

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.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses (CWE)

CWE-191CWE-476

References (5)

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

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