An asterisk security update has been released for Debian GNU/Linux 11.

DSA 4999-1: asterisk security update

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Debian Security Advisory DSA-4999-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
November 01, 2021   https://www.debian.org/security/faq
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Package : asterisk
CVE ID : CVE-2021-32558 CVE-2021-32686
Debian Bug : 991710 991931

Multiple vulnerabilities have been discovered in Asterisk, an open
source PBX and telephony toolkit, which may result in denial of service.

For the stable distribution (bullseye), these problems have been fixed in
version 1:16.16.1~dfsg-1+deb11u1.

We recommend that you upgrade your asterisk packages.

For the detailed security status of asterisk please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/asterisk

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/