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.

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Tracking

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Advisories
Source ID Title
Debian DSA Debian DSA DSA-6176-1 strongswan security update
Fixes

Solution

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Workaround

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History

Mon, 23 Mar 2026 19:30:00 +0000

Type Values Removed Values Added
Title strongSwan EAP-TTLS AVP Parsing Integer Underflow strongSwan 4.5.0 < 6.0.5 EAP-TTLS AVP Parsing Integer Underflow

Mon, 23 Mar 2026 19:00:00 +0000

Type Values Removed Values Added
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.
Title strongSwan EAP-TTLS AVP Parsing Integer Underflow
Weaknesses CWE-191
CWE-476
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.7, 'vector': '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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-03-23T19:16:09.076Z

Reserved: 2026-01-28T21:47:35.121Z

Link: CVE-2026-25075

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-03-23T19:16:39.313

Modified: 2026-03-23T19:16:39.313

Link: CVE-2026-25075

cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses