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Vulnerability record · CVE-2021-39841 · published 29 September 2021

CVE-2021-39841: Adobe acrobat type confusion vulnerability

Adobe · Acrobat

Acrobat Reader DC versions 2021.005.20060 (and earlier), 2020.004.30006 (and earlier) and 2017.011.30199 (and earlier) are affected by a Type Confusion vulnerability. An attacker could leverage this vulnerability to execute arbitrary code in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.

7.8 CVSS 3.0 High EPSS 12% · top 4.1% CWE-843 · Type confusion
7.8CVSS 3.0 base score, v2 6.8
12%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

Acrobat Reader DC versions 2021.005.20060 (and earlier), 2020.004.30006 (and earlier) and 2017.011.30199 (and earlier) are affected by a Type Confusion vulnerability. An attacker could leverage this vulnerability to execute arbitrary code in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.

CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://helpx.adobe.com/security/products/acrobat/apsb21-55.html Release NotesVendor Advisory
https://helpx.adobe.com/security/products/acrobat/apsb21-55.html Release NotesVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2014-0546Adobe Reader and Acrobat sandbox bypass allows privileged code executionAdobe Reader and Acrobat 10.x before 10.1.11 and 11.x before 11.0.08 on Windows contain a sandbox protection bypass. An attacker can escape the Reade…KEVEPSS 22%analysed9.8CVE-2013-3346Adobe Reader and Acrobat memory corruption allows code executionAdobe Reader and Acrobat 9.x before 9.5.5, 10.x before 10.1.7, and 11.x before 11.0.03 contain an out-of-bounds write (CWE-787) that corrupts memory.…KEVEPSS 79%analysed9.8CVE-2013-2729Adobe Reader and Acrobat integer overflow allows code executionAdobe Reader and Acrobat contain an integer overflow (CWE-190) that can be triggered by unspecified vectors, leading to arbitrary code execution. It …KEVEPSS 67%analysed9.8CVE-2011-2462Adobe Reader and Acrobat U3D memory corruption code executionAn out-of-bounds write in the U3D component of Adobe Reader and Acrobat allows remote attackers to corrupt memory and execute arbitrary code. The fla…KEVEPSS 89%analysed8.8CVE-2021-28550Adobe Acrobat and Reader use-after-free allows code executionAdobe Acrobat Reader DC (2021.001.20150, 2020.001.30020, 2017.011.30194 and earlier) and related Acrobat products contain a use-after-free (CWE-416) …KEVEPSS 52%analysed8.8CVE-2021-21017Adobe Acrobat and Reader heap buffer overflow via malicious fileAdobe Acrobat Reader DC (2020.013.20074, 2020.001.30018, 2017.011.30188 and earlier) contains a heap-based buffer overflow (CWE-122/CWE-787) triggere…KEVEPSS 86%analysed8.8CVE-2018-4990Adobe Acrobat and Reader double free allows code executionAdobe Acrobat and Reader contain a double free (CWE-415) in versions 2018.011.20038 and earlier, 2017.011.30079 and earlier, and 2015.006.30417 and e…KEVEPSS 36%analysed8.8CVE-2014-0496Adobe Reader and Acrobat use-after-free code executionAdobe Reader and Acrobat 10.x before 10.1.9 and 11.x before 11.0.06 on Windows and Mac OS X contain a use-after-free (CWE-416) that allows arbitrary …KEVEPSS 40%analysed

Source: NIST National Vulnerability Database (record CVE-2021-39841), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.