CVE-2021-39840

Published: Sep 29, 2021Modified: Jun 17, 2026

7.8

Vector

CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploitability: 1.8 / Impact: 5.9

Source: psirt@adobe.com (Secondary)

Description

Acrobat Reader DC versions 2021.005.20060 (and earlier), 2020.004.30006 (and earlier) and 2017.011.30199 (and earlier) are affected by a use-after-free vulnerability when processing AcroForms that could result in arbitrary code execution in the context of the current user. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

Affected (8)

Products: Adobe: Acrobat, Acrobat Reader, Acrobat Dc, Acrobat Reader Dc

4 products

Acrobat Reader Dc

Configuration A

2 vulnerable

Vulnerable Software	Affected Versions
Adobe Acrobat	20.001.30005 ≤ version ≤ 20.004.30006
Adobe Acrobat Reader	20.001.30005 ≤ version ≤ 20.004.30006

Configuration B

2 vulnerable

Vulnerable Software	Affected Versions
Adobe Acrobat Dc	15.008.20082 ≤ version ≤ 21.005.20058
Adobe Acrobat Reader Dc	15.008.20082 ≤ version ≤ 21.005.20058

Configuration C

2 vulnerable

Vulnerable Software	Affected Versions
Adobe Acrobat Dc	15.008.20082 ≤ version ≤ 21.005.20060
Adobe Acrobat Reader Dc	15.008.20082 ≤ version ≤ 21.005.20060

Configuration D

2 vulnerable · 2 platform

Vulnerable Software	Affected Versions
Adobe Acrobat	17.011.30059 ≤ version ≤ 17.011.30199
Adobe Acrobat Reader	17.011.30059 ≤ version ≤ 17.011.30199

Running on/with	Platform Versions
Apple Macos	All versions
Microsoft Windows	All versions

Related CWEs

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

References (2)

https://helpx.adobe.com/security/products/acrobat/apsb21-55.html

Source: psirt@adobe.com

Release NotesVendor Advisory

https://helpx.adobe.com/security/products/acrobat/apsb21-55.html

Source: af854a3a-2127-422b-91ae-364da2661108

Release NotesVendor Advisory

Timeline

No history available yet.