CVE-2026-25075
strongSwan 4.5.0 < 6.0.5 EAP-TTLS AVP Parsing Integer Underflow
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
Exploitability
AV:NAttack VectorNetwork
AC:LAttack ComplexityLow
PR:NPrivileges RequiredNone
UI:NUser InteractionNone
Scope
S:UScopeUnchanged
Impact
C:NConfidentialityNone
I:NIntegrityNone
A:HAvailabilityHigh
Weaknesses
Affected Products
strongSwan
oss-projectaka strongman, strongswan vpn client
Exploitability
No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
Attack Graph
Products CVE Techniques Tactics
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MITRE ATT&CK
2 techniques Impact
Initial Access
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
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