Vulnerability Intelligence Report
strongSwan 4.5.0 < 6.0.5 EAP-TTLS AVP Parsing Integer Underflow
CVE-2026-25075
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 Active Exploit Signals
CVSS Base Score
8.7
HIGH
EPSS Probability:1.01%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
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Authentication
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Weaponization
—
SSVC Action
—
Weaknesses (CWE)
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| strongSwan | strongSwan | 4.5.0 < 6.0.5 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
1.013%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | VulnCheck · Bug Bounty Provider · USA |
| Reserved | 2026-01-28T21:47:35 |
| Published | 2026-03-23T18:33:10 |
| Patch Date | 2026-03-23 |
| Last Updated | 2026-07-14T15:53:40 |
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