Vulnerability identifier: #VU50270

Vulnerability risk: Medium

CVSSv3.1: 7.4 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2021-22659

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Allen-Bradley MicroLogix 1400
Hardware solutions / Office equipment, IP-phones, print servers

Vendor: Rockwell Automation

Description

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

The vulnerability exists due to a boundary error. A remote attacker can send a specially crafted Modbus packet, trigger memory corruption, retrieve or modify random values in the register and cause a denial of service condition on the target system.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Allen-Bradley MicroLogix 1400: 21.6

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External links
http://ics-cert.us-cert.gov/advisories/icsa-21-033-01

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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.