CVE-2021-20592: Missing synchronization vulnerability in GOT2000 series GT27 model communication driver versions 01.19.000 thr

Q: How do I fix CVE-2021-20592?

gt softgot2000: upgrade to newer than 1.256s; got2000 gt27 firmware: upgrade to newer than 01.39.010; got2000 gt25 firmware: upgrade to newer than 01.39.010. Exact commands for each OS are on this page.

Q: Is CVE-2021-20592 being exploited?

CVE-2021-20592 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-20592 affect?

CVE-2021-20592 affects gt softgot2000, got2000 gt27 firmware, got2000 gt25 firmware. Severity is high (CVSS 7.5). 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

Q: How urgent is CVE-2021-20592?

Priority 50/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADEUPGRADEUPGRADE

CVE-2021-20592 is a high-severity flaw (CVSS 7.5) affecting gt softgot2000, got2000 gt27 firmware, got2000 gt25 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 ra

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.5% (top 26%)
CISA exploited list	No
Weakness	CWE-662
Published	2021-08-05
Last modified	2026-06-17

Publisher (CNA): Mitsubishi Electric Corporation · Vendor: mitsubishielectric

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-08-05 21:15 UTCPublished CVE record published
2026-06-17 03:34 UTCUpdated Record last modified

mitsubishielectric gt softgot2000 UPGRADE

Affected: >= 1.170c and <= 1.256s

Fixed in: newer than 1.256s

Safe to downgrade to: a release before 1.170c

1. Check installed version

apt-cache policy gt-softgot2000 || rpm -q gt-softgot2000 || gt-softgot2000 --version

2. UPGRADE to newer than 1.256s (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade gt-softgot2000

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade gt-softgot2000

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 1.170c (Debian / Ubuntu)

apt-cache madison gt-softgot2000 sudo apt install gt-softgot2000=<VERSION_BEFORE_1.170c> sudo apt-mark hold gt-softgot2000

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list gt-softgot2000 sudo dnf downgrade gt-softgot2000-<VERSION_BEFORE_1.170c> sudo dnf versionlock add gt-softgot2000

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

mitsubishielectric got2000 gt27 firmware UPGRADE

Affected: >= 01.19.000 and <= 01.39.010

Fixed in: newer than 01.39.010

Safe to downgrade to: a release before 01.19.000

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

mitsubishielectric got2000 gt25 firmware UPGRADE

Affected: >= 01.19.000 and <= 01.39.010

Fixed in: newer than 01.39.010

Safe to downgrade to: a release before 01.19.000

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

mitsubishielectric got2000 gt23 firmware UPGRADE

Affected: >= 01.19.000 and <= 01.39.010

Fixed in: newer than 01.39.010

Safe to downgrade to: a release before 01.19.000

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-20592?

gt softgot2000: upgrade to newer than 1.256s; got2000 gt27 firmware: upgrade to newer than 01.39.010; got2000 gt25 firmware: upgrade to newer than 01.39.010. Exact commands for each OS are on this page.

Is CVE-2021-20592 being exploited?

CVE-2021-20592 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-20592 affect?

CVE-2021-20592 affects gt softgot2000, got2000 gt27 firmware, got2000 gt25 firmware. Severity is high (CVSS 7.5). 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

How urgent is CVE-2021-20592?

Priority 50/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-0525 HIGH 7.5 UPGRADE UPGRADE Weak Encoding for Password vulnerability in Mitsubishi Electric Corporation GOT2000 Series GT27 model versions
CVE-2022-40269 MEDIUM 6.8 UPGRADE UPGRADE Authentication Bypass by Spoofing vulnerability in Mitsubishi Electric Corporation GOT2000 Series GT27 model v
CVE-2022-40268 MEDIUM 6.1 UPGRADE UPGRADE Improper Restriction of Rendered UI Layers or Frames vulnerability in Mitsubishi Electric Corporation GOT2000
CVE-2021-20601 HIGH 7.5 MITIGATE MITIGATE Improper input validation vulnerability in GOT2000 series GT27 model all versions, GOT2000 series GT25 model a

References

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