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CVE-2021-39863: Adobe Acrobat Reader DC Heap-based Buffer Overflow Vulnerability Could Lead To Arbitrary Code Execution

• Severity: medium (CVSS 6.8 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 13.2% 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-122

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 Buffer Overflow vulnerability when parsing a specially crafted PDF file. 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 for Edge: from 20.001.30005 through 20.004.30006
• Adobe Acrobat 2017: from 17.011.30059 through 17.011.30199
• Adobe Acrobat DC: from 15.008.20082 through 21.005.20060; from 15.008.20082 through 21.005.20058
• Adobe Acrobat Reader: from 20.001.30005 through 20.004.30006
• Adobe Acrobat Reader 2017: from 17.011.30059 through 17.011.30199
• Adobe Acrobat Reader: 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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