#VU55382 Missing Synchronization in Mitsubishi Electric products - CVE-2021-20592

Vulnerability identifier: #VU55382

Vulnerability risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-20592

CWE-ID: CWE-820

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
GOT2000 GT27 model
Server applications / SCADA systems
GOT2000 GT25 model
Server applications / SCADA systems
GOT2000 GT23 model
Server applications / SCADA systems
GT SoftGOT2000
Server applications / SCADA systems

Vendor: Mitsubishi Electric

Description

The vulnerability allows a remote attacker to perform a denial of servise (DoS) attack.

The vulnerability exists due to the affected software utilizes a shared resource in a concurrent manner but does not attempt to synchronize access to the resource. A remote attacker can cause a denial of service condition on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

GOT2000 GT27 model: 01.19.000 - 01.39.010

GOT2000 GT25 model: 01.19.000 - 01.39.010

GOT2000 GT23 model: 01.19.000 - 01.39.010

GT SoftGOT2000: 1.170C - 1.256S

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External links
https://ics-cert.us-cert.gov/advisories/icsa-21-208-02
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-007_en.pdf

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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.