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USN-5111-2: strongSwan vulnerability

19 October 2021

Several security issues were fixed in strongSwan.




USN-5111-1 fixed a vulnerability in strongSwan. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

Original advisory details:

It was discovered that strongSwan incorrectly handled replacing
certificates in the cache. A remote attacker could use this issue to cause
strongSwan to crash, resulting in a denial of service, or possibly execute
arbitrary code. (CVE-2021-41991)

Update instructions

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

Ubuntu 16.04
Ubuntu 14.04

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


Related notices

  • USN-5111-1: strongswan-starter, strongswan-scepclient, strongswan-tnc-client, libstrongswan, strongswan-tnc-base, strongswan-libcharon, charon-cmd, strongswan-swanctl, strongswan-tnc-ifmap, libcharon-standard-plugins, strongswan-tnc-pdp, strongswan-tnc-server, strongswan, libcharon-extauth-plugins, strongswan-nm, libstrongswan-extra-plugins, libstrongswan-standard-plugins, libcharon-extra-plugins, strongswan-charon, charon-systemd, strongswan-pki