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
EPSS: 0.506 (98.8th percentile) — read the EPSS interpretation.
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.
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- psirt@adobe.com (x_refsource_MISC, Release Notes, Vendor Advisory)
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.