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CVE-2021-39858: Adobe Acrobat Pro DC PostScript File Parsing Out-Of-Bounds Read Information Disclosure Vulnerability

• Severity: medium (CVSS 4.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.5% 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-125

Description

Acrobat Reader DC versions 2021.005.20060 (and earlier), 2020.004.30006 (and earlier) and 2017.011.30199 (and earlier) are affected by an out-of-bounds read vulnerability that could lead to disclosure of arbitrary memory information 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 17.011.30158 through 17.011.30199
• Adobe Acrobat DC: from 20.006.20034 through 21.005.20060; from 20.006.20034 through 21.005.20058
• Adobe Acrobat Reader: from 20.001.30005 through 20.004.30006
• Adobe Acrobat Reader 2017: from 17.011.30158 through 17.011.30199
• Adobe Acrobat Reader: from 20.006.20034 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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