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CVE-2021-39842: Adobe Acrobat Reader DC messageHandler.OnMessage Use-After-Free Vulnerability

• Severity: medium (CVSS 6.8 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 17.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-09-29 · updated 2026-06-17
• Weakness: CWE-416

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 that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.

Affected products

• Adobe Acrobat for Edge: from 20.001.30005 through 20.004.30006; from 17.011.30059 through 17.011.30199
• Adobe Acrobat DC: from 15.008.20082 through 21.005.20058; from 15.008.20082 through 21.005.20060
• Adobe Acrobat Reader: from 20.001.30005 through 20.004.30006; from 17.011.30059 through 17.011.30199
• Adobe Acrobat Reader: from 15.008.20082 through 21.005.20058; from 15.008.20082 through 21.005.20060

References

• https://helpx.adobe.com/security/products/acrobat/apsb21-55.html
• https://helpx.adobe.com/security/products/acrobat/apsb21-55.html

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