Vulnerability Details : CVE-2021-39863
Acrobat Reader DC versions 2021.005.20060 (and earlier), 2020.004.30006 (and earlier) and 2017.011.30199 (and earlier) are affected by a Buffer Overflow vulnerability when parsing a specially crafted PDF file. 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.
Vulnerability category: Overflow
Products affected by CVE-2021-39863
- Adobe » Acrobat Reader » Classic EditionVersions from including (>=) 20.001.30005 and up to, including, (<=) 20.004.30006cpe:2.3:a:adobe:acrobat_reader:*:*:*:*:classic:*:*:*
- Adobe » Acrobat » Classic EditionVersions from including (>=) 20.001.30005 and up to, including, (<=) 20.004.30006cpe:2.3:a:adobe:acrobat:*:*:*:*:classic:*:*:*
- Adobe » Acrobat Dc » Continuous EditionVersions from including (>=) 15.008.20082 and up to, including, (<=) 21.005.20058cpe:2.3:a:adobe:acrobat_dc:*:*:*:*:continuous:*:*:*
- Adobe » Acrobat Dc » Continuous EditionVersions from including (>=) 15.008.20082 and up to, including, (<=) 21.005.20060cpe:2.3:a:adobe:acrobat_dc:*:*:*:*:continuous:*:*:*
- Adobe » Acrobat Reader Dc » Continuous EditionVersions from including (>=) 15.008.20082 and up to, including, (<=) 21.005.20060cpe:2.3:a:adobe:acrobat_reader_dc:*:*:*:*:continuous:*:*:*
- Adobe » Acrobat 2017 » Classic 2017 EditionVersions from including (>=) 17.011.30059 and up to, including, (<=) 17.011.30199cpe:2.3:a:adobe:acrobat_2017:*:*:*:*:classic_2017:*:*:*
- Adobe » Acrobat Reader 2017 » Classic 2017 EditionVersions from including (>=) 17.011.30059 and up to, including, (<=) 17.011.30199cpe:2.3:a:adobe:acrobat_reader_2017:*:*:*:*:classic_2017:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-39863
11.95%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 93 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-39863
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
6.8
|
MEDIUM | AV:N/AC:M/Au:N/C:P/I:P/A:P |
8.6
|
6.4
|
NIST | |
|
7.8
|
HIGH | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
1.8
|
5.9
|
Adobe Systems Incorporated |
CWE ids for CVE-2021-39863
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A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().Assigned by: psirt@adobe.com (Primary)
References for CVE-2021-39863
-
https://helpx.adobe.com/security/products/acrobat/apsb21-55.html
Adobe Security BulletinRelease Notes;Vendor Advisory
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