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Debian 11: DLA-4359-1 strongswan Critical Buffer Overflow Exploit

debian lts
Calendar Grey November 3, 2025
Dist Debian Esm H88
Upgrade strongSwan due to critical buffer overflow vulnerability leading to remote code execution. Advisory DLA-4359-1.
Xu Biang discovered a buffer overflow bug in the eap-mschapv2 plugin of strongSwan, an IKE/IPsec suite
Topics%20covered

Topics Covered

security advisory buffer overflow debian vulnerability remote code strongSwan

Summary

The eap-mschapv2 plugin does not correctly check the length of an
EAP-MSCHAPv2 Failure Request packet on the client, which can cause an
integer underflow that leads to a crash, and a heap-based buffer overflow
that's potentially exploitable for remote code execution.

For Debian 11 bullseye, this problem has been fixed in version
5.9.1-1+deb11u5.

We recommend that you upgrade your strongswan packages.

For the detailed security status of strongswan please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/strongswan

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS


Severity
critical
Lowest
Low
Medium
High
Critical

Package: strongswan
Version: 5.9.1-1+deb11u5
CVE ID: CVE-2025-62291

Topics%20covered

Topics Covered

security advisory buffer overflow debian vulnerability remote code strongSwan

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