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CVE-2021-21017: Adobe Acrobat and Reader Heap-based Buffer Overflow Vulnerability

• Severity: medium (CVSS 6.8 v2.0)
• Exploited in the wild: yes — in CISA KEV since 2021-11-03
• EPSS: 86.3% 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-122

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 a heap-based buffer overflow 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 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
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-21017

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