CVE-2021-20590 Auth bypass in GOT SIMPLE series GS21 model GS2107-WTBD-N

High 7.5 Published 22 Apr 2021 Updated 3 Aug 2024

Remote attackers can bypass authentication to gain unauthorized access to Mitsubishi GOT HMI devices via VNC when the feature is enabled.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-20590?

CVE-2021-20590 is a high-severity authentication bypass vulnerability in GOT SIMPLE series GS21 model GS2107-WTBD-N, published on 22 Apr 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Improper authentication vulnerability in GOT2000 series GT27 model VNC server versions 01.39.010 and prior, GOT2000 series GT25 model VNC server versions 01.39.010 and prior, GOT2000 series GT21 model GT2107-WTBD VNC server versions 01.40.000 and prior, GOT2000 series GT21 model GT2107-WTSD VNC server versions 01.40.000 and prior, GOT SIMPLE series GS21 model GS2110-WTBD-N VNC server versions 01.40.000 and prior and GOT SIMPLE series GS21 model GS2107-WTBD-N VNC server versions 01.40.000 and prior allows a remote unauthenticated attacker to gain unauthorized access via specially crafted packets when the "VNC server" function is used.

Weakness: CWE-287

Which versions are affected by CVE-2021-20590?

It affects 6 products.

Products include Mitsubishielectric Got2000 Gt25 Firmware, Mitsubishielectric Got2000 Gt27 Firmware, Mitsubishielectric Gs2107-Wtbd-N Firmware, Mitsubishielectric Gs2110-Wtbd-N Firmware, Mitsubishielectric Gt2107-Wtbd Firmware, Mitsubishielectric Gt2107-Wtsd Firmware.

How do I fix CVE-2021-20590?

No fix has been published for CVE-2021-20590 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2021-20590 being exploited?

There is no known exploitation of CVE-2021-20590 in the wild and no public exploit code.

Sources

Also known as GHSA-p459-vh9f-cr64.