CVE-2021-39858

Adobe Acrobat Pro DC PostScript File Parsing Out-Of-Bounds Read Information Disclosure Vulnerability

Severity Score

3.3

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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 read vulnerability that could lead to disclosure of arbitrary memory information in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.

Acrobat Reader DC versiones 2021.005.20060 (y anteriores), versiones 2020.004.30006 (y anteriores), y versiones 2017.011.30199 (y anteriores), están afectadas por una vulnerabilidad de lectura fuera de límites que podría conllevar a una divulgación de información de memoria arbitraria en el contexto del usuario actual. Es requerida una interacción del usuario para explotar este problema, ya que la víctima debe abrir un archivo malicioso

This vulnerability allows remote attackers to disclose sensitive information on affected installations of Adobe Acrobat Pro DC. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.
The specific flaw exists within the parsing of PostScript files. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated buffer. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the current process.

*Credits: Qiao Li Of Baidu Security Lab

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-08-23 CVE Reserved
2021-09-16 CVE Published
2024-09-02 EPSS Updated
2024-09-16 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-125: Out-of-bounds Read

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://helpx.adobe.com/security/products/acrobat/apsb21-55.html	2023-11-07

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Adobe Search vendor "Adobe"	Acrobat Dc Search vendor "Adobe" for product "Acrobat Dc"	>= 20.006.20034 <= 21.005.20060 Search vendor "Adobe" for product "Acrobat Dc" and version " >= 20.006.20034 <= 21.005.20060"	continuous	Affected	in	Microsoft Search vendor "Microsoft"	Windows Search vendor "Microsoft" for product "Windows"	-	-	Safe
Adobe Search vendor "Adobe"	Acrobat Dc Search vendor "Adobe" for product "Acrobat Dc"	>= 20.006.20034 <= 21.005.20058 Search vendor "Adobe" for product "Acrobat Dc" and version " >= 20.006.20034 <= 21.005.20058"	continuous	Affected	in	Apple Search vendor "Apple"	Macos Search vendor "Apple" for product "Macos"	-	-	Safe
Adobe Search vendor "Adobe"	Acrobat Reader Dc Search vendor "Adobe" for product "Acrobat Reader Dc"	>= 20.006.20034 <= 21.005.20060 Search vendor "Adobe" for product "Acrobat Reader Dc" and version " >= 20.006.20034 <= 21.005.20060"	continuous	Affected	in	Microsoft Search vendor "Microsoft"	Windows Search vendor "Microsoft" for product "Windows"	-	-	Safe
Adobe Search vendor "Adobe"	Acrobat Dc Search vendor "Adobe" for product "Acrobat Dc"	>= 20.006.20034 <= 21.005.20058 Search vendor "Adobe" for product "Acrobat Dc" and version " >= 20.006.20034 <= 21.005.20058"	continuous	Affected	in	Apple Search vendor "Apple"	Macos Search vendor "Apple" for product "Macos"	-	-	Safe
Adobe Search vendor "Adobe"	Acrobat 2017 Search vendor "Adobe" for product "Acrobat 2017"	>= 17.011.30158 <= 17.011.30199 Search vendor "Adobe" for product "Acrobat 2017" and version " >= 17.011.30158 <= 17.011.30199"	classic_2017	Affected	in	Apple Search vendor "Apple"	Macos Search vendor "Apple" for product "Macos"	-	-	Safe
Adobe Search vendor "Adobe"	Acrobat 2017 Search vendor "Adobe" for product "Acrobat 2017"	>= 17.011.30158 <= 17.011.30199 Search vendor "Adobe" for product "Acrobat 2017" and version " >= 17.011.30158 <= 17.011.30199"	classic_2017	Affected	in	Microsoft Search vendor "Microsoft"	Windows Search vendor "Microsoft" for product "Windows"	-	-	Safe
Adobe Search vendor "Adobe"	Acrobat Reader 2017 Search vendor "Adobe" for product "Acrobat Reader 2017"	>= 17.011.30158 <= 17.011.30199 Search vendor "Adobe" for product "Acrobat Reader 2017" and version " >= 17.011.30158 <= 17.011.30199"	classic_2017	Affected	in	Apple Search vendor "Apple"	Macos Search vendor "Apple" for product "Macos"	-	-	Safe
Adobe Search vendor "Adobe"	Acrobat Reader 2017 Search vendor "Adobe" for product "Acrobat Reader 2017"	>= 17.011.30158 <= 17.011.30199 Search vendor "Adobe" for product "Acrobat Reader 2017" and version " >= 17.011.30158 <= 17.011.30199"	classic_2017	Affected	in	Microsoft Search vendor "Microsoft"	Windows Search vendor "Microsoft" for product "Windows"	-	-	Safe
Adobe Search vendor "Adobe"	Acrobat Search vendor "Adobe" for product "Acrobat"	>= 20.001.30005 <= 20.004.30006 Search vendor "Adobe" for product "Acrobat" and version " >= 20.001.30005 <= 20.004.30006"	classic	Affected	in	Apple Search vendor "Apple"	Macos Search vendor "Apple" for product "Macos"	-	-	Safe
Adobe Search vendor "Adobe"	Acrobat Search vendor "Adobe" for product "Acrobat"	>= 20.001.30005 <= 20.004.30006 Search vendor "Adobe" for product "Acrobat" and version " >= 20.001.30005 <= 20.004.30006"	classic	Affected	in	Microsoft Search vendor "Microsoft"	Windows Search vendor "Microsoft" for product "Windows"	-	-	Safe
Adobe Search vendor "Adobe"	Acrobat Reader Search vendor "Adobe" for product "Acrobat Reader"	>= 20.001.30005 <= 20.004.30006 Search vendor "Adobe" for product "Acrobat Reader" and version " >= 20.001.30005 <= 20.004.30006"	classic	Affected	in	Apple Search vendor "Apple"	Macos Search vendor "Apple" for product "Macos"	-	-	Safe
Adobe Search vendor "Adobe"	Acrobat Reader Search vendor "Adobe" for product "Acrobat Reader"	>= 20.001.30005 <= 20.004.30006 Search vendor "Adobe" for product "Acrobat Reader" and version " >= 20.001.30005 <= 20.004.30006"	classic	Affected	in	Microsoft Search vendor "Microsoft"	Windows Search vendor "Microsoft" for product "Windows"	-	-	Safe