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Vulnerability DatabaseCVE-2021-21057

CVE-2021-21057: 
Adobe Acrobat Reader Continuous vulnerability analysis and mitigation

Overview

CVE-2021-21057 is a null pointer dereference vulnerability affecting Adobe Acrobat Reader DC versions 2020.013.20074 and earlier, 2020.001.30018 and earlier, and 2017.011.30188 and earlier. The vulnerability was discovered by Xinyu Wan (wxyxsx) and disclosed in February 2021 (NVD, Adobe Advisory).

Technical details

The vulnerability is classified as a null pointer dereference (CWE-476) that occurs when parsing a specially crafted PDF file. The severity is rated as MEDIUM with a CVSS 3.1 Base Score of 6.6 (Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H) (NVD).

Impact

When exploited, this vulnerability could lead to denial of service in the context of the current user. The attack requires user interaction as the victim must open a malicious file (NVD).

Exploitability

The vulnerability requires user interaction to be exploited, as an unauthenticated attacker would need the target to open a malicious PDF file. The attack complexity is considered low, but requires local access (NVD).

Mitigation and workarounds

Adobe has released security updates to address this vulnerability. Users should update to the latest version of Adobe Acrobat and Reader (Adobe Advisory).

Additional resources

Source: This report was generated using AI

Related Adobe Acrobat Reader Continuous vulnerabilities:

CVE ID

Severity

Score

Technologies

Component name

CISA KEV exploit

Has fix

Published date

CVE-2020-9695HIGH7.8
  • Adobe Acrobat Reader Continuous logoAdobe Acrobat Reader Continuous
  • cpe:2.3:a:adobe:acrobat_reader:*:*:*:*:classic:*:*:*
NoYesJun 23, 2026
CVE-2026-47965HIGH7.8
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  • cpe:2.3:a:adobe:acrobat_reader_dc
NoYesJun 12, 2026
CVE-2026-47955HIGH7.8
  • Adobe Acrobat Reader Continuous logoAdobe Acrobat Reader Continuous
  • cpe:2.3:a:adobe:acrobat
NoYesJun 09, 2026
CVE-2020-9713MEDIUM5.5
  • Adobe Acrobat Reader Continuous logoAdobe Acrobat Reader Continuous
  • cpe:2.3:a:adobe:acrobat_dc:*:*:*:*:classic:*:*:*
NoYesJun 23, 2026
CVE-2020-9711MEDIUM5.5
  • Adobe Acrobat Reader Continuous logoAdobe Acrobat Reader Continuous
  • cpe:2.3:a:adobe:acrobat_dc
NoYesJun 23, 2026

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