CVE-2019-14868: Apple Mac OS X

High severity, CVSS 7.8. EPSS: 1.4% chance of exploitation in the next 30 days.

In ksh version 20120801, a flaw was found in the way it evaluates certain environment variables. An attacker could use this flaw to override or bypass environment restrictions to execute shell commands. Services and applications that allow remote unauthenticated attackers to provide one of those environment variables could allow them to exploit this issue remotely.

Affected products

• Apple Mac OS X: before 10.15.5 (fixed in 10.15.5)
• Debian Debian Linux: version 9.0 only
• Ksh Project Ksh: version 20120801 only

Published 2020-04-02. Last modified 2026-06-17.