Debian Security Advisory

DLA-2414-1 fastd -- LTS security update

Date Reported:
25 Oct 2020
Affected Packages:
Security database references:
In the Debian bugtracking system: Bug 972521.
In Mitre's CVE dictionary: CVE-2020-27638.
More information:

In fastd, a fast and secure tunnelling daemon, a receive buffer handling problem was discovered which allows a denial of service (memory exhaustion) when receiving packets with an invalid type code.

For Debian 9 stretch, this problem has been fixed in version 18-2+deb9u1.

We recommend that you upgrade your fastd packages.

For the detailed security status of fastd 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: