An OpenSSH security update has been released for Ubuntu 20.04 LTS and 20.10.

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Ubuntu Security Notice USN-4762-1
March 10, 2021

openssh vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.10
- Ubuntu 20.04 LTS

Summary:

OpenSSH could be made to crash or run programs if it received specially
crafted network traffic.

Software Description:
- openssh: secure shell (SSH) for secure access to remote machines

Details:

It was discovered that the OpenSSH ssh-agent incorrectly handled memory. A
remote attacker able to connect to the agent could use this issue to cause
it to crash, resulting in a denial of service, or possibly execute
arbitrary code.

Update instructions:

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

Ubuntu 20.10:
openssh-client 1:8.3p1-1ubuntu0.1

Ubuntu 20.04 LTS:
openssh-client 1:8.2p1-4ubuntu0.2

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

References:
  https://ubuntu.com/security/notices/USN-4762-1
CVE-2021-28041

Package Information:
  https://launchpad.net/ubuntu/+source/openssh/1:8.3p1-1ubuntu0.1
  https://launchpad.net/ubuntu/+source/openssh/1:8.2p1-4ubuntu0.2