CVE-2021-21086
Adobe Reader CoolType Arbitrary Stack Manipulation
- Published
- Sep 2, 2021
- Updated
- Sep 17, 2024
- Assigning CNA
- adobe
- Evidence observed
- Aug 8, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HLow · next 30 days
- Percentile
- 91.4%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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 Write vulnerability in the CoolType library. 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.
Sources
1- Exploit-CVE-2021-21086Exploit
Python-based exploit for CVE-2021-21086 in Adobe Acrobat Reader DC, generating malicious PDFs with shellcode execution via crafted font charstrings.
Responsible use
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