CVE-2021-39843
HighAcrobat Reader DC versions 2021.005.20060 (and earlier), 2020.004.30006 (and earlier) and 2017.011.30199 (and earlier) are affected by an out-of-bounds write vulnerability 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-2021-39843 is a high-severity vulnerability (CVSS 7.8 v3.1) 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 77% 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 v3.1
7.8
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
77%
Higher than 99.5% 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-2021-39843 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
Acrobat Reader DC versions 2021.005.20060 (and earlier), 2020.004.30006 (and earlier) and 2017.011.30199 (and earlier) are affected by an out-of-bounds write 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.
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-787 Out-of-bounds Write
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 an out-of-bounds write vulnerability 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.
Is CVE-2021-39843 Running On Your Attack Surface?
Brandefense maps vulnerabilities like this one to your internet-facing assets and tells you exactly where to patch.
Request A Demo