CVE Vulnerabilities


Access of Resource Using Incompatible Type ('Type Confusion')

Published: Aug 20, 2021 | Modified: Aug 26, 2021
CVSS 3.x
CVSS 2.x

Acrobat Reader DC versions 2021.005.20054 (and earlier), 2020.004.30005 (and earlier) and 2017.011.30197 (and earlier) are affected by a Type Confusion vulnerability. An unauthenticated attacker could leverage this vulnerability to disclose sensitive 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.


The program allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.

Affected Software

Name Vendor Start Version End Version
Acrobat_dc Adobe 15.008.20082 21.005.20054
Acrobat_dc Adobe 17.011.30059 17.011.30197
Acrobat_dc Adobe 20.001.30005 20.004.30005
Acrobat_reader_dc Adobe 15.008.20082 21.005.20054
Acrobat_reader_dc Adobe 17.011.30059 17.011.30197
Acrobat_reader_dc Adobe 20.001.30005 20.004.30005

Extended Description

When the program accesses the resource using an incompatible type, this could trigger logical errors because the resource does not have expected properties. In languages without memory safety, such as C and C++, type confusion can lead to out-of-bounds memory access. While this weakness is frequently associated with unions when parsing data with many different embedded object types in C, it can be present in any application that can interpret the same variable or memory location in multiple ways. This weakness is not unique to C and C++. For example, errors in PHP applications can be triggered by providing array parameters when scalars are expected, or vice versa. Languages such as Perl, which perform automatic conversion of a variable of one type when it is accessed as if it were another type, can also contain these issues.