PT-2021-2317 · Adobe · Acrobat Reader

Published 2021-02-09 · Updated 2021-09-08 · CVE-2021-21057

Positive Technologies (AI Summary)

CVSS v3.1

6.6

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Acrobat Reader DC versions 2020.013.20074 and earlier Acrobat Reader DC versions 2020.001.30018 and earlier Acrobat Reader DC versions 2017.011.30188 and earlier

Description A null pointer dereference vulnerability exists when parsing a specially crafted PDF file, allowing an unauthenticated attacker to achieve denial of service in the context of the current user. Exploitation requires user interaction, where a victim must open a malicious file. This issue may also allow attackers to obtain sensitive information.

Recommendations For Acrobat Reader DC versions 2020.013.20074 and earlier, update to a version later than 2020.013.20074 to resolve the issue. For Acrobat Reader DC versions 2020.001.30018 and earlier, update to a version later than 2020.001.30018 to resolve the issue. For Acrobat Reader DC versions 2017.011.30188 and earlier, update to a version later than 2017.011.30188 to resolve the issue. As a temporary workaround, consider avoiding the use of PDF parsing functionality until a patch is available. Restrict access to malicious PDF files to minimize the risk of exploitation.

Fix

DoS

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

BDU:2021-01552

CVE-2021-21057

Affected Products

Acrobat Reader

References · 8

• https://osv.dev/vulnerability/CVE-2021-21057 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-01552 · Security Note
• https://helpx.adobe.com/security/products/acrobat/apsb21-09.html · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-21057 · Security Note
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21057 · Note
• https://t.me/cibsecurity/23480 · Telegram Post
• https://t.me/cvenotify/9932 · Telegram Post
• https://t.me/cvenotify/9807 · Telegram Post