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Fencer Intel
high 7.8

CVE-2021-39842 in the critical feed json

Adobe Acrobat Reader DC messageHandler.OnMessage Use-After-Free Vulnerability

published 5y ago modified 4mo ago also EUVD-2021-26199

cvss
7.8
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
17.4%
EPSS 17.4% chance of exploitation in 30 days, percentile 97%
public exploits
0
none known

Summary

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 that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.

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Exploit prediction

17.35% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.0 7.8 CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

  • Adobe Acrobat Reader

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.