What is CVE-2021-39841?

CVE-2021-39841 is a high-severity vulnerability in Adobe Acrobat, classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 7.8/10. Published 2021-09-29.

How severe is CVE-2021-39841?

High severity. CVSS v3 base score is 7.8 out of 10.

Vulnerability in Adobe Acrobat

CVE-2021-39841

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.

Published 2021-09-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.117 (95.9th percentile), scored 2026-10-02.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 95.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.117 · newest: 0.117 · change: 0.000

Affected products

Adobe Acrobat
Adobe Acrobat Dc
Adobe Acrobat Reader — versions unspecified
Adobe Acrobat Reader
Adobe Acrobat Reader Dc
Apple macOS
Microsoft Windows

Weakness classification (CWE)

CWE-843 — Access of Resource Using Incompatible Type (Type Confusion)

References

helpx.adobe.com/security/products/acrobat/apsb21-55.html (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2021-39841?: CVE-2021-39841 is a high-severity vulnerability in Adobe Acrobat, classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 7.8/10. Published 2021-09-29.
How severe is CVE-2021-39841?: High severity. CVSS v3 base score is 7.8 out of 10.