CVE-2021-21017

HIGH CISA KEV EPSS 99.7%
Published Feb 11, 20215y ago · Modified Jun 17, 20262w ago
8.8 CVSS 3.1
High
Find Similar
Published Feb 11, 2021 5y ago
Last Modified Jun 17, 2026 2w ago
KEV Listed Nov 3, 2021 4y ago
KEV Due Nov 17, 2021 1690d overdue

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.

CVSS Details

Base Score
8.8
Exploitability
2.8
Impact
5.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

CISA Known Exploited Overdue 1690d
Added
Nov 3, 2021
Due
Nov 17, 2021

Apply updates per vendor instructions.

EPSS Exploit Probability
99.7% percentile
Exploit & Patch Status
Actively Exploited (KEV)
No Patch Available

Weaknesses 2

CWE-122
CWE-787 Out-of-bounds Write Memory Safety

Affected Products 8

VendorProductVersionRange
adobeacrobat*≥17.0  –  ≤17.011.30188
adobeacrobat*≥20.0  –  ≤20.001.30018
adobeacrobat_dc* ≤20.013.20074
adobeacrobat_reader*≥17.0  –  ≤17.011.30188
adobeacrobat_reader*≥20.0  –  ≤20.001.300183
adobeacrobat_reader_dc* ≤20.013.20074
applemacos*any
microsoftwindows*any

References 2

  • helpx.adobe.com https://helpx.adobe.com/security/products/acrobat/apsb21-09.html
    Vendor Advisory
  • cisa.gov https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-21017
    Third Party AdvisoryUS Government Resource

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.