Is CVE-2021-21017 actively exploited?

CVE-2021-21017 has no public evidence of in-the-wild exploitation as of 2025-10-23.

What is the CVSS score for CVE-2021-21017?

CVE-2021-21017 has a CVSS score of 8.8 (HIGH severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

How do I patch CVE-2021-21017?

Patch guidance is available from adobe security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2021-21017.

Fix CVE-2021-21017 - HIGH adobe acrobat

Q: Which products are affected by CVE-2021-21017?

6 products: adobe acrobat, adobe acrobat, adobe acrobat dc, adobe acrobat reader, adobe acrobat reader, and 1 more.

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 Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector: network
Complexity: low
Privileges: none
User Action: required
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Weaknesses: CWE-122 CWE-787 · Out-of-bounds Write

Metadata

Primary Vendor: ADOBE
Published: 2/11/2021
Last Modified: 10/23/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

adobe : acrobatadobe : acrobatadobe : acrobat_dcadobe : acrobat_readeradobe : acrobat_readeradobe : acrobat_reader_dc

Remediation Guidance

Executive Summary

View on NIST NVD