PT-2021-3926 · Adobe · Acrobat Reader

Published 2021-07-13 · Updated 2021-09-01 · CVE-2021-35981

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 2021.005.20054 and earlier Acrobat Reader DC versions 2020.004.30005 and earlier Acrobat Reader DC versions 2017.011.30197 and earlier

Description The issue is related to a use-after-free vulnerability that could allow 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 vulnerability may impact the confidentiality, integrity, and availability of protected information.

Recommendations For versions 2021.005.20054 and earlier, update to a version later than 2021.005.20054 to resolve the issue. For versions 2020.004.30005 and earlier, update to a version later than 2020.004.30005 to resolve the issue. For versions 2017.011.30197 and earlier, update to a version later than 2017.011.30197 to resolve the issue. As a temporary workaround, consider avoiding the use of launchURL functionality until a patch is available.

Fix

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

BDU:2021-04443

CVE-2021-35981

ZDI-21-807

Affected Products

Acrobat Reader

References · 7

• https://zerodayinitiative.com/advisories/ZDI-21-807 · Security Note
• https://bdu.fstec.ru/vul/2021-04443 · Security Note
• https://osv.dev/vulnerability/CVE-2021-35981 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-35981 · Security Note
• https://helpx.adobe.com/security/products/acrobat/apsb21-51.html · Vendor Advisory
• https://vuldb.com/?id.178498 · Note
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-35981 · Note