It was found that apt-key in apt, all versions, do not correctly validate gpg keys with the master keyring, leading to a potential man-in-the-middle attack.Referenceshttps://security-tracker.debian.org/tracker/CVE-2011-3374https://access.redhat.com/security/cve/cve-2011-3374https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=642480https://snyk.io/vuln/SNYK-LINUX-APT-116518https://people.canonical.com/~ubuntu-security/cve/2011/CVE-2011-3374.htmlhttps://seclists.org/fulldisclosure/2011/Sep/221https://ubuntu.com/security/CVE-2011-3374