Debian Security Advisory

DLA-2909-1 strongswan -- LTS security update

Date Reported:
04 Feb 2022
Affected Packages:
Security database references:
In Mitre's CVE dictionary: CVE-2021-45079.
More information:

Zhuowei Zhang discovered a bug in the EAP authentication client code of strongSwan, an IKE/IPsec suite, that may allow to bypass the client and in some scenarios even the server authentication, or could lead to a denial-of-service attack.

For Debian 9 stretch, this problem has been fixed in version 5.5.1-4+deb9u6.

We recommend that you upgrade your strongswan packages.

For the detailed security status of strongswan please refer to its security tracker page at:

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