The authentication algorithm in Abbott Laboratories pacemakers manufactured prior to Aug 28, 2017, which involves an authentication key and time stamp, can be compromised or bypassed, which may allow a nearby attacker to issue unauthorized commands to the pacemaker via RF communications. CVSS v3 base score: 7.5, CVSS vector string: AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H. Abbott has developed a firmware update to help mitigate the identified vulnerabilities.