CVE-2021-21017 KEV
8.8
HIGH · CVSS 3.1 · EPSS 86.3% (pctl 100)
Patch first
On CISA KEV — known exploited in the wild, due 2021-11-17.
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.
Scoring
| CVSS | 8.8 (HIGH, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| EPSS | 86.33% — more likely to be exploited than 100% of all CVEs |
| Weakness | CWE-122 |
| On CISA KEV | yes — remediate by 2021-11-17 |
| Public exploit | none known |
| Published | 2021-02-11 |
| Last modified | 2026-06-17 |
CISA KEV
| Name | Adobe Acrobat and Reader Heap-based Buffer Overflow Vulnerability |
|---|---|
| Added | 2021-11-03 |
| Due | 2021-11-17 |
| Vendor / product | Adobe / Acrobat and Reader |
| Ransomware use | none reported |
Affected (6)
| Vendor | Product |
|---|---|
| adobe | acrobat |
| adobe | acrobat dc |
| adobe | acrobat reader |
| adobe | acrobat reader dc |
| apple | macos |
| microsoft | windows |
References
→ the Explorer · watch your stack · NVD