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CVE-2026-25075

HIGH

7.5

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.

CVE Details

CVSS v3.1 Score7.5

SeverityHIGH

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published3/23/2026

Last Modified3/27/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-191CWE-476

References

https://www.strongswan.org/blog/2026/03/23/strongswan-6.0.5-released.html(disclosure@vulncheck.com)

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

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

https://lists.debian.org/debian-lts-announce/2026/03/msg00016.html(af854a3a-2127-422b-91ae-364da2661108)

IOC Correlations

No correlations recorded

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