CVE-2021-20601: Improper input validation vulnerability in GOT2000 series GT27 model all versions, GOT2000 series GT25 model a

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HIGH 7.5REMOTEMITIGATEMITIGATEMITIGATE

CVE-2021-20601 is a high-severity flaw (CVSS 7.5) affecting gt softgot2000, got simple gs2110-wtbd firmware, got simple gs2107-wtbd firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper input validation vulnerability in GOT2000 series GT27 model all versions, GOT2000 series GT25 model all versions, GOT2000 series GT23 model all versions, GOT2000 series GT21 model all versions, GOT SIMPLE series GS21 model all versions, and GT SoftGOT2000 all versions allows an remote unauthenticated attacker to write a value that exceeds the configured input range limit by sending a malicious packet to rewrite the device value. As a res

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.4% (top 16%)
CISA exploited list	No
Weakness	CWE-20
Published	2021-11-23
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

2021-11-23 15:15 UTCPublished CVE record published
2026-06-17 03:34 UTCUpdated Record last modified

mitsubishielectric gt softgot2000 MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

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

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

mitsubishielectric got simple gs2110-wtbd firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

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 got simple gs2107-wtbd firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

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 gt2104-rtbd firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

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 gt2103-pmbd firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

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 gt2103-pmbds firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

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-2021-20601?

gt softgot2000: mitigate or apply the listed mitigation; got simple gs2110-wtbd firmware: mitigate or apply the listed mitigation; got simple gs2107-wtbd firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-20601 being exploited?

CVE-2021-20601 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-2021-20601 affect?

CVE-2021-20601 affects gt softgot2000, got simple gs2110-wtbd firmware, got simple gs2107-wtbd firmware. Severity is high (CVSS 7.5). Improper input validation vulnerability in GOT2000 series GT27 model all versions, GOT2000 series GT25 model all versions, GOT2000 series GT23 model all versions, GOT2000 series GT21 model all versions, GOT SIMPLE series GS21 model all vers

How urgent is CVE-2021-20601?

Priority 52/100. 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-2021-20592 HIGH 7.5 UPGRADE UPGRADE Missing synchronization vulnerability in GOT2000 series GT27 model communication driver versions 01.19.000 thr

References

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