PT-2021-2313 · Adobe · Acrobat Reader

Published 2021-02-09 · Updated 2021-09-08 · CVE-2021-21039

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/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 The issue is related to a Use After Free vulnerability, which allows an unauthenticated attacker to achieve arbitrary code execution in the context of the current user. Exploitation requires user interaction, where a victim must open a malicious file. This can be done using a specially crafted PDF file.

Recommendations For versions 2020.013.20074 and earlier, update to a version later than 2020.013.20074 to resolve the issue. For versions 2020.001.30018 and earlier, update to a version later than 2020.001.30018 to resolve the issue. For 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 Adobe Reader DC to open PDF files from untrusted sources until a patch is available.

Fix

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

BDU:2021-01548

CVE-2021-21039

Affected Products

Acrobat Reader

References · 7

• https://safe-surf.ru/specialists/bulletins-nkcki/661681 · Security Note
• https://bdu.fstec.ru/vul/2021-01548 · Security Note
• https://helpx.adobe.com/security/products/acrobat/apsb21-09.html · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-21039 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-21039 · Security Note
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21039 · Note
• https://t.me/cibsecurity/23489 · Telegram Post