Vulnerability identifier: #VU53921

Vulnerability risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-28554

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: No

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

Vendor: Adobe

Description

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to a boundary condition when processing relative paths. A remote attacker can create a specially crafted PDF file, trick the victim into opening it, trigger out-of-bounds read error and compromise the affected system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Adobe Reader: 2020.001.30020 - 2020.013.20074, 2017.011.30156 - 2017.011.30196

Adobe Acrobat: 21.001.20135 - 21.001.20155, 20.001.30020 - 20.013.20074, 17.008.30051 - 17.011.30196

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External links
http://helpx.adobe.com/security/products/acrobat/apsb21-37.html
http://www.zerodayinitiative.com/advisories/ZDI-21-659/

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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?

No. We are not aware of malware exploiting this vulnerability.