CVE-2026-25075strongSwan 4.5.0 < 6.0.5 EAP-TTLS AVP Parsing Integer Underflow
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-191, CWE-476
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Jul 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
strongSwan strongSwan strongswan:strongswan (from the name) | from 4.5.0 before 6.0.5 | CNA record |
References
- https://www.strongswan.org/blog/2026/03/23/strongswan-vulnerability-(cve-2026-25075).htmlvendor-advisory, exploit
- https://www.strongswan.org/blog/2026/03/23/strongswan-6.0.5-released.htmlrelease-notes
- https://y637f9qq2x.com/posts/cve-2026-25075/technical-description, exploit
- https://www.vulncheck.com/advisories/strongswan-eap-ttls-avp-parsing-integer-underflowthird-party-advisory
- https://lists.debian.org/debian-lts-announce/2026/03/msg00016.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.