Use After Free in Adobe Acrobat

CVE-2021-39840

Acrobat Reader DC versions 2021.005.20060 (and earlier), 2020.004.30006 (and earlier) and 2017.011.30199 (and earlier) are affected by a use-after-free vulnerability when processing AcroForms that could result in arbitrary code execution in the context of the current user. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

Vulnerability class: Use-After-Free

Published · last modified .

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: 0.506 (98.9th percentile), scored .

High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 98.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2021-39840: held from 0.506 to 0.506.

EPSS over last 30 days · oldest: 0.506 · newest: 0.506 · change: 0.000

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2021-39840?
CVE-2021-39840 is a high-severity vulnerability in Adobe Acrobat, classified under Use After Free. CVSS score: 7.8/10. Published 2021-09-29.
How severe is CVE-2021-39840?
High severity. CVSS v3 base score is 7.8 out of 10.
Is CVE-2021-39840 known to be exploited?
2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.