Vulnerability identifier: #VU50530

Vulnerability risk: Critical

CVSSv3.1: 8.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2021-21017

CWE-ID: CWE-122

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Adobe Acrobat
Client/Desktop applications / Office applications
Adobe Reader
Client/Desktop applications / Office applications

Vendor: Adobe

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when processing PDF files. A remote attacker can create a specially crafted PDf file, trick the victim into opening it, trigger a heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Note, the vulnerability is being actively exploited in the wild.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Adobe Acrobat: 20.001.30002 - 20.013.20074, 15.006.30306 - 15.006.30527, 17.008.30051 - 17.012.20098

Adobe Reader: 2020.001.30005 - 2020.013.20074, 2019.008.20071 - 2019.021.20061, 2015.006.30306 - 2015.006.30523, 2017.009.20044 - 2017.012.20098, 2018.009.20044 - 2018.011.20063

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External links
http://helpx.adobe.com/security/products/acrobat/apsb21-09.html

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.