CVE-2021-39840

Name: CVE-2021-39840
Creator: NVD / NIST
Published: 2021-09-29T16:15:08.753+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 49.53%

Last modified Jun 17, 2026

CVE-2021-39840 is a vulnerability of currently unknown severity. Acrobat Reader DC versions 2021.005.20060 (and earlier), 2020.004.30006 (and earlier) and 2017.011.30199 (and earlier) are affected by a use-after-free vulnerability when processing AcroForms that could result in arbitrary code execution in the context of the current user. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.. EPSS estimates a 49.53% chance of exploitation in the next 30 days.

Description

Acrobat Reader DC versions 2021.005.20060 (and earlier), 2020.004.30006 (and earlier) and 2017.011.30199 (and earlier) are affected by a use-after-free vulnerability when processing AcroForms that could result in arbitrary code execution in the context of the current user. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

Metrics

EPSS Probability

49.53%

98.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-416

Affected Software

Vendor	Product	Versions
Adobe	Acrobat	>= 20.001.30005, <= 20.004.30006
Adobe	Acrobat Reader	>= 20.001.30005, <= 20.004.30006
Adobe	Acrobat Dc	>= 15.008.20082, <= 21.005.20058
Adobe	Acrobat Reader Dc	>= 15.008.20082, <= 21.005.20058
Adobe	Acrobat Dc	>= 15.008.20082, <= 21.005.20060
Adobe	Acrobat Reader Dc	>= 15.008.20082, <= 21.005.20060
Adobe	Acrobat	>= 17.011.30059, <= 17.011.30199
Adobe	Acrobat Reader	>= 17.011.30059, <= 17.011.30199

References

https://helpx.adobe.com/security/products/acrobat/apsb21-55.htmlRelease Notes, Vendor Advisory
https://helpx.adobe.com/security/products/acrobat/apsb21-55.htmlRelease Notes, Vendor Advisory

Timeline

Published: Sep 29, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-39840?

How severe is CVE-2021-39840?

Severity scoring for CVE-2021-39840 is pending analysis. The EPSS model estimates a 49.53% probability of exploitation in the next 30 days.

How do I fix CVE-2021-39840?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-39840?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST