Vulnerability Details : CVE-2021-39859
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 that could lead to disclosure of sensitive memory. An attacker could leverage this vulnerability to bypass mitigations such as ASLR. Exploitation of this issue requires user interaction in that a victim must open a malicious file.
Vulnerability category: Memory Corruption
Products affected by CVE-2021-39859
- Adobe » Acrobat Reader » Classic EditionVersions from including (>=) 20.001.30005 and before (<) 20.004.30015cpe:2.3:a:adobe:acrobat_reader:*:*:*:*:classic:*:*:*
- Adobe » Acrobat Reader » Classic EditionVersions from including (>=) 17.011.30180 and before (<) 17.011.30202cpe:2.3:a:adobe:acrobat_reader:*:*:*:*:classic:*:*:*
- Adobe » Acrobat » Classic EditionVersions from including (>=) 17.011.30180 and before (<) 17.011.30202cpe:2.3:a:adobe:acrobat:*:*:*:*:classic:*:*:*
- Adobe » Acrobat » Classic EditionVersions from including (>=) 20.001.30005 and before (<) 20.004.30015cpe:2.3:a:adobe:acrobat:*:*:*:*:classic:*:*:*
- Adobe » Acrobat Dc » Continuous EditionVersions from including (>=) 15.007.20033 and up to, including, (<=) 21.005.20058cpe:2.3:a:adobe:acrobat_dc:*:*:*:*:continuous:*:*:*
- Adobe » Acrobat Dc » Continuous EditionVersions from including (>=) 15.007.20033 and up to, including, (<=) 21.005.20060cpe:2.3:a:adobe:acrobat_dc:*:*:*:*:continuous:*:*:*
- Adobe » Acrobat Reader Dc » Continuous EditionVersions from including (>=) 15.007.20033 and up to, including, (<=) 21.005.20058cpe:2.3:a:adobe:acrobat_reader_dc:*:*:*:*:continuous:*:*:*
- Adobe » Acrobat Reader Dc » Continuous EditionVersions from including (>=) 15.007.20033 and up to, including, (<=) 21.005.20060cpe:2.3:a:adobe:acrobat_reader_dc:*:*:*:*:continuous:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-39859
0.14%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 50 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-39859
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
5.5
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N |
1.8
|
3.6
|
Adobe Systems Incorporated |
CWE ids for CVE-2021-39859
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The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.Assigned by: psirt@adobe.com (Primary)
References for CVE-2021-39859
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https://helpx.adobe.com/security/products/acrobat/apsb21-55.html
Adobe Security BulletinVendor Advisory
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