CVE-2021-39840
HighAcrobat 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.
Published Sep 29, 2021 · Updated Nov 21, 2024
Key Facts
Patch immediately- CVE-2021-39840 is a high-severity vulnerability (CVSS 7.8 v3) affecting Acrobat (Adobe), Acrobat Dc (Adobe), Acrobat Reader (Adobe) and 1 more product.
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 51% probability of exploitation in the next 30 days.
- Fixed versions are available, including Acrobat <=20.004.30006, Acrobat Dc <=21.005.20058, Acrobat Reader <=20.004.30006.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v3
7.8
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
51%
Higher than 98.9% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
None known
Get the full CVE-2021-39840 brief as a PDF
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Description
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.
Affected Products
5 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| AcrobatAdobe | See advisory | 20.004.30006 |
| Acrobat DcAdobe | See advisory | 21.005.20058 |
| Acrobat ReaderAdobe | >= unspecified | 20.004.30006 |
| Acrobat Reader DcAdobe | See advisory | 21.005.20058 |
Patched Releases
Acrobat
<=20.004.30006
Acrobat Dc
<=21.005.20058
Acrobat Reader
<=20.004.30006
Acrobat Reader Dc
<=21.005.20058
Timeline
Publicly disclosed
Sep 29, 2021
Last updated
Nov 21, 2024
Weakness Type
- CWE-416 Use After Free
References
FAQ
Common Questions.
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.
Affected: Acrobat (Adobe); Acrobat Dc (Adobe); Acrobat Reader (Adobe) versions >= unspecified, among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Acrobat <=20.004.30006, Acrobat Dc <=21.005.20058, Acrobat Reader <=20.004.30006.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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