PT-2021-22950 · Adobe · Acrobat Reader

Mark Vincent Yason + 1 · Published 2021-09-14 · Updated 2021-11-06 · CVE-2021-40726

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 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 vulnerability exists when processing AcroForm fields, potentially resulting in arbitrary code execution in the context of the current user. This issue requires user interaction, where the target must visit a malicious page or open a malicious file to exploit the vulnerability.

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 AcroForm fields until a patch is available.

Fix

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2021-40726

ZDI-21-1249

Affected Products

Acrobat Reader

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2021-40726 · Security Note
• https://zerodayinitiative.com/advisories/ZDI-21-1249 · Security Note
• https://osv.dev/vulnerability/CVE-2021-40726 · Vendor Advisory
• https://helpx.adobe.com/security/products/acrobat/apsb21-55.html · Vendor Advisory
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-40726 · Note
• https://t.me/cibsecurity/30185 · Telegram Post