CVE-2026-25075

HIGH EPSS 58.9%
Published Mar 23, 20263mo ago · Modified Jun 17, 20261w ago
8.7 CVSS 4.0
High
Find Similar
Published Mar 23, 2026 3mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
8.7
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
58.9% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 2

CWE-191
CWE-476 NULL Pointer Dereference Memory Safety

References 5

  • lists.debian.org https://lists.debian.org/debian-lts-announce/2026/03/msg00016.html
  • strongswan.org 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
  • vulncheck.com https://www.vulncheck.com/advisories/strongswan-eap-ttls-avp-parsing-integer-underflow
  • y637f9qq2x.com https://y637f9qq2x.com/posts/cve-2026-25075/

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.