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Ubuntu 25.10 strongSwan Critical DoS Exploit USN-8117-1 CVE-2026-25075

ubuntu
Calendar Grey March 23, 2026
Dist Ubuntu Esm H88
strongSwan update addresses critical resource consumption issue for Ubuntu systems with potential denial of service.
strongSwan could be made to consume resources or crash if it received specially crafted network traffic.

Summary

strongSwan could be made to consume resources or crash if it received

specially crafted network traffic.

Software Description:

- strongswan: IPsec VPN solution

Details:

Kazuma Matsumoto discovered that strongSwan incorrectly handled EAP-TTLS

AVPs when using the eap-ttls plugin. An attacker could possibly use this

issue to cause strongSwan to consume resources and crash, resulting in a

denial of service.

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu strongSwan

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 25.10
  libstrongswan                   6.0.1-6ubuntu4.2
  strongswan                      6.0.1-6ubuntu4.2

Ubuntu 24.04 LTS
  libstrongswan                   5.9.13-2ubuntu4.24.04.2
  strongswan                      5.9.13-2ubuntu4.24.04.2

Ubuntu 22.04 LTS
  libstrongswan                   5.9.5-2ubuntu2.5
  strongswan                      5.9.5-2ubuntu2.5

In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-8117-1

CVE-2026-25075

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8117-1

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu strongSwan

Package Information

https://launchpad.net/ubuntu/+source/strongswan/6.0.1-6ubuntu4.2
https://launchpad.net/ubuntu/+source/strongswan/5.9.13-2ubuntu4.24.04.2
https://launchpad.net/ubuntu/+source/strongswan/5.9.5-2ubuntu2.5

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