CVE-2021-20592

Name: CVE-2021-20592
Creator: NVD / NIST
Published: 2021-08-05T21:15:10.467+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.50%

Last modified Jun 17, 2026

CVE-2021-20592 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Missing synchronization vulnerability in GOT2000 series GT27 model communication driver versions 01.19.000 through 01.39.010, GT25 model communication driver versions 01.19.000 through 01.39.010 and GT23 model communication driver versions 01.19.000 through 01.39.010 and GT SoftGOT2000 versions 1.170C through 1.256S allows a remote unauthenticated attacker to cause DoS condition on the MODBUS/TCP slave communication function of the products by rapidly and repeatedly connecting and disconnecting to and from the MODBUS/TCP communication port on a target. Restart or reset is required to recover.. EPSS estimates a 1.50% chance of exploitation in the next 30 days.

Description

Missing synchronization vulnerability in GOT2000 series GT27 model communication driver versions 01.19.000 through 01.39.010, GT25 model communication driver versions 01.19.000 through 01.39.010 and GT23 model communication driver versions 01.19.000 through 01.39.010 and GT SoftGOT2000 versions 1.170C through 1.256S allows a remote unauthenticated attacker to cause DoS condition on the MODBUS/TCP slave communication function of the products by rapidly and repeatedly connecting and disconnecting to and from the MODBUS/TCP communication port on a target. Restart or reset is required to recover.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

1.50%

70.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-662

Affected Software

Vendor	Product	Versions
Mitsubishielectric	Gt Softgot2000	>= 1.170c, <= 1.256s
Mitsubishielectric	Got2000 Gt27 Firmware	>= 01.19.000, <= 01.39.010
Mitsubishielectric	Got2000 Gt25 Firmware	>= 01.19.000, <= 01.39.010
Mitsubishielectric	Got2000 Gt23 Firmware	>= 01.19.000, <= 01.39.010

References

Timeline

Published: Aug 5, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20592?

How severe is CVE-2021-20592?

CVE-2021-20592 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.50% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20592?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-20592?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST