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USN-4938-1: Unbound vulnerabilities

6 May 2021

Several security issues were fixed in Unbound.



  • unbound - validating, recursive, caching DNS resolver


It was discovered that Unbound contained multiple security issues. A
remote attacker could possibly use these issues to cause a denial of
service, inject arbitrary commands, execute arbitrary code, and overwrite
local files.

Update instructions

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

Ubuntu 20.04
Ubuntu 18.04

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