CVE-2021-39843: Adobe Acrobat

High severity, CVSS 7.8. EPSS: 76.7% chance of exploitation in the next 30 days.

Acrobat Reader DC versions 2021.005.20060 (and earlier), 2020.004.30006 (and earlier) and 2017.011.30199 (and earlier) are affected by an out-of-bounds write vulnerability that could result in 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 20.001.30005, up to and including 20.004.30006; from 17.011.30059, up to and including 17.011.30199
• Adobe Acrobat DC: from 15.008.20082, up to and including 21.005.20058; from 15.008.20082, up to and including 21.005.20060
• Adobe Acrobat Reader: from 20.001.30005, up to and including 20.004.30006; from 17.011.30059, up to and including 17.011.30199
• Adobe Acrobat Reader DC: from 15.008.20082, up to and including 21.005.20058; from 15.008.20082, up to and including 21.005.20060

Published 2021-09-29. Last modified 2026-06-17.