CVE-2016-4121: Adobe Air Desktop Runtime

Critical severity, CVSS 9.8. EPSS: 10% chance of exploitation in the next 30 days.

Use-after-free vulnerability in Adobe Flash Player before 18.0.0.352 and 19.x through 21.x before 21.0.0.242 on Windows and OS X and before 11.2.202.621 on Linux allows attackers to execute arbitrary code via unspecified vectors, a different vulnerability than CVE-2016-1097, CVE-2016-1106, CVE-2016-1107, CVE-2016-1108, CVE-2016-1109, CVE-2016-1110, CVE-2016-4108, and CVE-2016-4110.

Affected products

• Adobe Air Desktop Runtime: up to and including 21.0.0.198
• Adobe Air SDK: up to and including 21.0.0.198
• Adobe Air SDK & Compiler: up to and including 21.0.0.198
• Adobe Flash Player: up to and including 21.0.0.241; up to and including 18.0.0.343; up to and including 11.2.202.616; up to and including 21.0.0.216
• Adobe Flash Player Desktop Runtime: up to and including 21.0.0.226

Published 2016-06-16. Last modified 2026-06-17.