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CVE-2021-40731: Adobe Acrobat Reader DC JPEG2000 Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability

• Severity: medium (CVSS 6.8 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 8.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-10-15 · updated 2026-06-17
• Weakness: CWE-787

Description

Adobe Acrobat Reader DC version 21.007.20095 (and earlier), 21.007.20096 (and earlier), 20.004.30015 (and earlier), and 17.011.30202 (and earlier) is affected by an out-of-bounds write vulnerability when parsing a crafted JPEG2000 file, which 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 20.004.30015; from 17.011.30158 through 17.011.30202
• Adobe Acrobat DC: from 15.008.20082 through 21.007.20095; from 15.008.20082 through 21.007.20096
• Adobe Acrobat Reader: from 20.001.30005 through 20.004.30015; from 17.011.30158 through 17.011.30202
• Adobe Acrobat Reader: from 15.008.20082 through 21.007.20095; from 15.008.20082 through 21.007.20096

References

• https://helpx.adobe.com/security/products/acrobat/apsb21-104.html
• https://helpx.adobe.com/security/products/acrobat/apsb21-104.html

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