CVE-2021-28639
HighAcrobat Reader DC versions 2021.005.20054 (and earlier), 2020.004.30005 (and earlier) and 2017.011.30197 (and earlier) are affected by an Use-after-free vulnerability.
Published Jul 14, 2021 · Updated Sep 16, 2024
Key Facts
Patch immediately- CVE-2021-28639 is a high-severity vulnerability (CVSS 7.8 v3.1) affecting Acrobat Dc (Adobe), Acrobat Reader Dc (Adobe), Acrobat Reader.
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 66% probability of exploitation in the next 30 days.
- Fixed versions are available, including Acrobat Dc <=17.011.30197, Acrobat Dc <=21.005.20054, Acrobat Reader Dc <=17.011.30197.
- 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)
66%
Higher than 99.2% 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-2021-28639 brief as a PDF
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Description
Acrobat Reader DC versions 2021.005.20054 (and earlier), 2020.004.30005 (and earlier) and 2017.011.30197 (and earlier) are affected by an Use-after-free vulnerability. An unauthenticated attacker could leverage this vulnerability to achieve 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 |
|---|---|---|
| Acrobat DcAdobe | See advisory | 17.011.30197 |
| Acrobat Reader DcAdobe | See advisory | 17.011.30197 |
| Acrobat Reader | >= unspecified | n/a |
Patched Releases
Acrobat Dc
<=17.011.30197, <=21.005.20054
Acrobat Reader Dc
<=17.011.30197, <=21.005.20054
Timeline
Publicly disclosed
Jul 14, 2021
Last updated
Sep 16, 2024
Weakness Type
- CWE-416 Use After Free
References
- advisoryhttps://helpx.adobe.com/security/products/acrobat/apsb21-51.html
- advisoryhttps://us-cert.cisa.gov/ncas/current-activity/2021/07/13/adobe-releases-security-updates-multiple-products
- advisoryhttps://www.cybersecurity-help.cz/vdb/SB2021071317
- advisoryhttps://www.cybersecurity-help.cz/vdb/SB2021071320
- advisoryhttps://www.securityweek.com/adobe-critical-flaws-reader-acrobat-illustrator?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+securityweek+%28SecurityWeek+RSS+Feed%29
FAQ
Common Questions.
Acrobat Reader DC versions 2021.005.20054 (and earlier), 2020.004.30005 (and earlier) and 2017.011.30197 (and earlier) are affected by an Use-after-free vulnerability.
Affected: Acrobat Dc (Adobe); Acrobat Reader Dc (Adobe); Acrobat Reader versions >= unspecified. 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 Dc <=17.011.30197, Acrobat Dc <=21.005.20054, Acrobat Reader Dc <=17.011.30197.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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