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CVE-2026-25075

strongSwan 4.5.0 < 6.0.5 EAP-TTLS AVP Parsing Integer Underflow

Published: Mar 23, 2026Updated: Jul 14, 2026 Sources: CVE List NVDCWE-191
7.5HIGH
NVD MITRE
EPSS Score
1.0%
Top 40.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-191CWE-476

Affected Products

strongSwan
oss-projectaka strongswan vpn client, strongman
strongSwanOn-prem
Networking Infrastructure / vpn-gateway

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Impact
Initial Access
View detailed technique mapping

References

https://www.strongswan.org/blog/2026/03/23/strongswan-6.0.5-released.html
strongswan.org
https://www.strongswan.org/blog/2026/03/23/strongswan-vulnerability-(cve-2026-25075).html
strongswan.org
https://www.vulncheck.com/advisories/strongswan-eap-ttls-avp-parsing-integer-underflow
vulncheck.com
and 2 more references View all →
News mentions
1

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