Use-after-free in Adobe Reader and Adobe Acrobat - CVE-2021-39840
Published: September 14, 2021
Vulnerability identifier: #VU56540
CSH Severity: High
CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-39840
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a use-after-free error when processing PDF files. A remote attacker can trick the victim to open a specially crafted PDF file, trigger a use-after-free error and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
Adobe Reader
Adobe Acrobat
Adobe Acrobat
How to mitigate CVE-2021-39840
Install updates from vendor's website.
Adobe Reader - addressed in versions 17.011.30202, 20.004.30015, 21.007.20091
Adobe Acrobat - addressed in versions 17.011.30202, 20.004.30015, 21.007.20091
Adobe Acrobat - addressed in versions 17.011.30202, 20.004.30015, 21.007.20091