CVE-2026-25075
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductstrongSwan
PublishedMar 23, 2026
First seenMar 23, 2026
Weakness typeCWE-191CWE-191CWE-476NULL pointer dereference
How to fix
Update
- strongSwan strongSwan6.0.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| strongSwan strongSwan | 4.5.0 ≤ v < 6.0.5 | 6.0.5 |
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