QwikSec

Security Database

CVE

CWE

Training

CVE-2026-25075

Published: Mar 23, 2026

Modified: May 6, 2026

PUBLISHED

CVSS v3.1

7.5

HIGH

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.

Vendor	Product	Versions
strongSwan	strongSwan	affected `4.5.0 - < 6.0.5`

Weaknesses (CWE)

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

References

https://www.strongswan.org/blog/2026/03/23/strongswan-vulnerability-(cve-2026-25075).html

vendor-advisory

exploit

https://www.strongswan.org/blog/2026/03/23/strongswan-6.0.5-released.html

release-notes

https://y637f9qq2x.com/posts/cve-2026-25075/

technical-description

exploit

https://www.vulncheck.com/advisories/strongswan-eap-ttls-avp-parsing-integer-underflow

third-party-advisory

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