What is CVE-2021-39850?

CVE-2021-39850 is a medium-severity vulnerability in Adobe Acrobat, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2021-09-29.

How severe is CVE-2021-39850?

Medium severity. CVSS v3 base score is 5.5 out of 10.

NULL pointer dereference in Adobe Acrobat

CVE-2021-39850

Acrobat Reader DC versions 2021.005.20060 (and earlier), 2020.004.30006 (and earlier) and 2017.011.30199 (and earlier) are affected by a Null pointer dereference vulnerability. An unauthenticated attacker could leverage this vulnerability to achieve an application denial-of-service 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 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.019 (79.4th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 79.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · 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-476 — NULL Pointer Dereference

References

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

Frequently asked questions

What is CVE-2021-39850?: CVE-2021-39850 is a medium-severity vulnerability in Adobe Acrobat, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2021-09-29.
How severe is CVE-2021-39850?: Medium severity. CVSS v3 base score is 5.5 out of 10.