A NSS security update has been released for Ubuntu Linux 18.04 LTS, 20.04 LTS, and 21.10.

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Ubuntu Security Notice USN-5410-1
May 11, 2022

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

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

NSS could be made to stop responding if it received a specially crafted message.

Software Description:
- nss: Network Security Service library

Details:

Lenny Wang discovered that NSS incorrectly handled certain
messages. A remote attacker could possibly use this issue to cause
servers compiled with NSS to stop responding, resulting in a denial of service.

Update instructions:

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

Ubuntu 20.04 LTS:
libnss3 2:3.49.1-1ubuntu1.7

Ubuntu 18.04 LTS:
libnss3 2:3.35-2ubuntu2.14

After a standard system update you need to restart any applications that
use NSS to make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-5410-1
CVE-2020-25648

Package Information:
https://launchpad.net/ubuntu/+source/nss/2:3.49.1-1ubuntu1.7
https://launchpad.net/ubuntu/+source/nss/2:3.35-2ubuntu2.14