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CVE-2021-28639: Adobe Acrobat Reader DC setAction Use-After-Free Remote Code Execution Vulnerability

• Severity: critical (CVSS 9.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 66.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-08-20 · updated 2026-06-17
• Weakness: CWE-416

Description

Acrobat Reader DC versions 2021.005.20054 (and earlier), 2020.004.30005 (and earlier) and 2017.011.30197 (and earlier) are affected by an Use-after-free vulnerability. An unauthenticated attacker could leverage this vulnerability to achieve 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 DC: from 15.008.20082 through 21.005.20054; from 17.011.30059 through 17.011.30197; from 20.001.30005 through 20.004.30005
• Adobe Acrobat Reader: from 15.008.20082 through 21.005.20054; from 17.011.30059 through 17.011.30197; from 20.001.30005 through 20.004.30005

References

• https://helpx.adobe.com/security/products/acrobat/apsb21-51.html
• https://helpx.adobe.com/security/products/acrobat/apsb21-51.html

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