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

debian lts
Calendar Grey November 3, 2025
Scroller Debian Lts
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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