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Ubuntu 25.10: strongSwan Important DoS Risk USN-7841-1 CVE-2025-62291

ubuntu
Calendar Grey October 27, 2025
Dist Ubuntu Esm H88
strongSwan in Ubuntu has a security issue that can lead to crash or code execution upon receiving malicious network traffic.
strongSwan client could be made to crash or run programs if it received specially crafted network traffic.

Summary

strongSwan client could be made to crash or run programs if it received

specially crafted network traffic.

Software Description:

- strongswan: IPsec VPN solution

Details:

Xu Biang discovered that the strongSwan client incorrectly handled

EAP-MSCHAPv2 failure requests. If a user or automated system were tricked

into connecting to a malicious server, a remote attacker could use this

issue to cause strongSwan to crash, resulting in a denial of service, or

possibly execute arbitrary code.

Topics%20covered

Topics Covered

security advisory denial of service remote code execution Ubuntu important strongSwan

Update Instructions

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

Ubuntu 25.10
  libstrongswan                   6.0.1-6ubuntu4.1
  strongswan                      6.0.1-6ubuntu4.1

Ubuntu 25.04
  libstrongswan                   5.9.13-2ubuntu4.25.04.1
  strongswan                      5.9.13-2ubuntu4.25.04.1

Ubuntu 24.04 LTS
  libstrongswan                   5.9.13-2ubuntu4.24.04.1
  strongswan                      5.9.13-2ubuntu4.24.04.1

Ubuntu 22.04 LTS
  libstrongswan                   5.9.5-2ubuntu2.4
  strongswan                      5.9.5-2ubuntu2.4

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

References

https://ubuntu.com/security/notices/USN-7841-1

CVE-2025-62291

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7841-1

Topics%20covered

Topics Covered

security advisory denial of service remote code execution Ubuntu important strongSwan

Package Information

https://launchpad.net/ubuntu/+source/strongswan/6.0.1-6ubuntu4.1
https://launchpad.net/ubuntu/+source/strongswan/5.9.13-2ubuntu4.25.04.1

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