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CVE-2021-21034: Acrobat Reader DC Out-Of-Bounds Read Information Disclosure Vulnerability

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-02-11 · updated 2026-06-17
• Weakness: CWE-125

Description

Acrobat Reader DC versions versions 2020.013.20074 (and earlier), 2020.001.30018 (and earlier) and 2017.011.30188 (and earlier) are affected by an Out-of-bounds Read vulnerability. An unauthenticated attacker could leverage this vulnerability to locally elevate privileges 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 17.0 through 17.011.30188; from 20.0 through 20.001.30018
• Adobe Acrobat DC: through 20.013.20074
• Adobe Acrobat Reader: from 17.0 through 17.011.30188; from 20.0 through 20.001.300183
• Adobe Acrobat Reader: through 20.013.20074

References

• https://helpx.adobe.com/security/products/acrobat/apsb21-09.html
• https://helpx.adobe.com/security/products/acrobat/apsb21-09.html

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