PT-2021-6291 · Adobe · Acrobat Reader

Published 2021-09-14 · Updated 2021-10-06 · CVE-2021-39851

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

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

Description A Null pointer dereference issue affects Adobe Acrobat and Reader, allowing an unauthenticated attacker to achieve an application denial-of-service in the context of the current user. Exploitation requires user interaction, where a victim must open a malicious file.

Recommendations For Acrobat Reader DC versions 2021.005.20060 and earlier, update to a version later than 2021.005.20060 to resolve the issue. For Acrobat Reader DC versions 2020.004.30006 and earlier, update to a version later than 2020.004.30006 to resolve the issue. For 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 opening of suspicious or malicious files to minimize the risk of exploitation.

Fix

DoS

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

BDU:2022-01263

CVE-2021-39851

Affected Products

Acrobat Reader

References · 8

• https://osv.dev/vulnerability/CVE-2021-39851 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-39851 · Security Note
• https://bdu.fstec.ru/vul/2022-01263 · Security Note
• https://helpx.adobe.com/security/products/acrobat/apsb21-55.html · Vendor Advisory
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-39851 · Note
• https://t.me/cvenotify/22026 · Telegram Post
• https://helpx.adobe.com/ru/security/products/acrobat/apsb21-55.html · Note
• https://t.me/cibsecurity/29653 · Telegram Post