PT-2021-4843 · Adobe · Acrobat Reader

Published 2021-09-14 · Updated 2021-10-06 · CVE-2021-39842

Positive Technologies (AI Summary)

CVSS v2.0

9.3

High

Base vector

AV:N/AC:M/Au:N/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions Adobe Acrobat Reader DC versions 2021.005.20060 and earlier Adobe Acrobat Reader DC versions 2020.004.30006 and earlier Adobe Acrobat Reader DC versions 2017.011.30199 and earlier

Description A use-after-free issue affects the software, potentially allowing arbitrary code execution in the context of the current user. This issue can be exploited if a user opens a malicious file, specifically a specially crafted PDF file. Exploitation requires user interaction.

Recommendations For Adobe Acrobat Reader DC versions 2021.005.20060 and earlier, update to a version later than 2021.005.20060 to resolve the issue. For Adobe Acrobat Reader DC versions 2020.004.30006 and earlier, update to a version later than 2020.004.30006 to resolve the issue. For Adobe Acrobat Reader DC versions 2017.011.30199 and earlier, update to a version later than 2017.011.30199 to resolve the issue. As a temporary workaround, consider avoiding the use of the affected software to open PDF files from untrusted sources until a patch is available.

Fix

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

BDU:2021-05571

CVE-2021-39842

Affected Products

Acrobat Reader

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2021-39842 · Security Note
• https://osv.dev/vulnerability/CVE-2021-39842 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-05571 · Security Note
• https://helpx.adobe.com/security/products/acrobat/apsb21-55.html · Vendor Advisory
• https://safe-surf.ru/specialists/bulletins-nkcki/669565 · Security Note
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-39842 · Note