CVE-2021-21086: Adobe Acrobat

High severity, CVSS 7.8. EPSS: 4.7% chance of exploitation in the next 30 days.

Acrobat Reader DC versions versions 2020.013.20074 (and earlier), 2020.001.30018 (and earlier) and 2017.011.30188 (and earlier) are affected by an Out-of-bounds Write vulnerability in the CoolType library. An unauthenticated attacker could leverage this vulnerability to achieve arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.

Affected products

• Adobe Acrobat: from 17.011.30056, up to and including 17.011.30188; from 20.001.30005, up to and including 20.001.30018
• Adobe Acrobat DC: from 20.006.20042, up to and including 20.013.20074
• Adobe Acrobat Reader: from 17.011.30059, up to and including 17.011.30188; from 20.001.30005, up to and including 20.001.300183
• Adobe Acrobat Reader DC: from 20.006.20042, up to and including 20.013.20074

Published 2021-09-02. Last modified 2026-06-17.