CVE-2026-25075

CVE Enrichment

CVSS: 8.7 HIGH
EPSS: 1.05%
EPSS Percentile: 64.49%
CISA KEV: Not listed

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.

Technical Details

CVSS Version: 4.0
CNA / NVD Source: [email protected]
Published: 24-Mar-2026 02:16
Last Modified: 14-Jul-2026 23:16
EPSS Date: 2026-11-06
CWE: CWE-191, CWE-476

CVSS Vector


            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

CNA Products / Version Status

strongSwan · strongSwan Source: CNA · [email protected]
Default status: unaffected

4.5.0 ≤ version < 6.0.5 — affected (semver)

packageURL: pkg:github/strongswan/strongswan
repo: https://github.com/strongswan/strongswan

References

Last enrichment sync: 07-Nov-2026 12:37
Sources: NVD · FIRST EPSS · CISA KEV
Latest successful provider update; providers refresh independently.

Reported Context (1)

Bishop Fox and strongSwan (CVE-2026-25075) advise upgrading vulnerable installations to 6.0.5 or later, disabling EAP-TTLS if unused, and using the provided non-crashing test tool to check for exposure. CVE-2026-25075 in strongSwan EAP-TTLS Can Crash VPN Services

MITRE ATT&CK (1)

Vendors (1)

Products (1)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.