The problem can be corrected by updating your system to the following package versions: Ubuntu 19.04: libnss3 2:3.42-1ubuntu2.1 Ubuntu 18.04 LTS: libnss3 2:3.35-2ubuntu2.3 Ubuntu 16.04 LTS: libnss3 2:3.28.4-0ubuntu0.16.04.6 After a standard system update you need to restart any applications that use NSS, such as Evolution, to make all the necessary changes.
https://ubuntu.com/security/notices/USN-4060-1
CVE-2019-11719, CVE-2019-11727, CVE-2019-11729
https://launchpad.net/ubuntu/+source/nss/2:3.42-1ubuntu2.1 https://launchpad.net/ubuntu/+source/nss/2:3.35-2ubuntu2.3 https://launchpad.net/ubuntu/+source/nss/2:3.28.4-0ubuntu0.16.04.6
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