Integer Underflow Vulnerability in strongSwan's EAP-TTLS AVP Parser
CVE-2026-25075

8.7HIGH

Key Information:

Vendor

Strongswan

Status
Strongswan
Vendor
CVE Published:
23 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-25075?

strongSwan versions ranging from 4.5.0 up to 6.0.4 are impacted by an integer underflow vulnerability in the EAP-TTLS AVP parser. This flaw enables unauthenticated remote attackers to disrupt service by submitting specially crafted AVP data with erroneous length fields during IKEv2 authentication. The vulnerability arises from inadequate validation of AVP length fields, leading to excessive memory allocation or NULL pointer dereferences, which can crash the charon IKE daemon and potentially incapacitate the device.

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Affected Version(s)

strongSwan 4.5.0 < 6.0.5

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-25075 - Proof of Concept

References

https://www.strongswan.org/blog/2026/03/23/strongswan-vul...
vendor-advisoryexploit
https://www.strongswan.org/blog/2026/03/23/strongswan-6.0...
release-notes
https://www.vulncheck.com/advisories/strongswan-eap-ttls-...
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Kazuma Matsumoto, a security researcher at GMO Cybersecurity by IERAE, Inc.
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