CVE-2021-20592

highpriority · track · 31EPSS 0.015 · 74 %ileEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

1.50% (74th) EPSS

CVSS 7.8 · high

Is it mine?

10 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · cisa_csaf_ot · nvd

EPSS · scored 2026-10-26

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.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedGOT2000 models GT27 GT25 GT23cisa_csaf_ot
GT SoftGOT2000: Update to Version 1.26W or later
FixedGT SoftGOT2000cisa_csaf_ot
GT SoftGOT2000: Update to Version 1.26W or later
MitigationGOT2000 models GT27 GT25 GT23cisa_csaf_ot
GOT2000 models GT27, GT25, GT23: Update communication driver to version 01.40.000 or later (Fixed communication driver is included in GT Designer3 Version1(GOT2000) Version 1.260W or later)
MitigationGT SoftGOT2000cisa_csaf_ot
GOT2000 models GT27, GT25, GT23: Update communication driver to version 01.40.000 or later (Fixed communication driver is included in GT Designer3 Version1(GOT2000) Version 1.260W or later)

cvss

Technical severity, 0–10. One row per scoring source.

7.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5.9–7.8

v2.07.8highAV:N/AC:L/Au:N/C:N/I:N/A:Cprimary · NVD / NIST USexploitability 10 · impact 6.9

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.05.9mediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · CISA US

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-662USprimaryCWE-820US

affected products (10)

Products and version ranges known to be affected.

GOT2000 models GT27 GT25 GT23: All communication driver versions between 01.19.000 and 01.39.010all versionscisa_csaf_otUS
GT SoftGOT2000: All versions between 1.170C and 1.256Sall versionscisa_csaf_otUS
Mitsubishi Electric GOT2000 models GT27 GT25 GT2301.19.000 | → 01.39.010cisa_csaf_otUS
Mitsubishi Electric GT SoftGOT20001.170c | → 1.256Scisa_csaf_otUS
n/a GOT2000 series GT27 model; GT25 model; GT23 model; GT SoftGOT2000≤ versions 1.170C through 1.256Senisa_euvdEU
n/a GOT2000 series GT27 model; GT25 model; GT23 model; GT SoftGOT2000≤ communication driver versions 01.19.000 through 01.39.010enisa_euvdEU
mitsubishielectric got2000 gt23 firmware01.19.000 → 01.39.010nvdUScpe:2.3:o:mitsubishielectric:got2000_gt23_firmware:*:*:*:*:*:*:*:*
mitsubishielectric got2000 gt25 firmware01.19.000 → 01.39.010nvdUScpe:2.3:o:mitsubishielectric:got2000_gt25_firmware:*:*:*:*:*:*:*:*
mitsubishielectric got2000 gt27 firmware01.19.000 → 01.39.010nvdUScpe:2.3:o:mitsubishielectric:got2000_gt27_firmware:*:*:*:*:*:*:*:*
mitsubishielectric gt softgot20001.170c → 1.256snvdUScpe:2.3:a:mitsubishielectric:gt_softgot2000:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

ICSA-21-208-02Mitsubishi Electric GOT2000 series and GT SoftGOT20002021-07-27icsa · cisa_csaf_otUS
Successful exploitation of this vulnerability could allow an attacker to cause a denial-of-service condition.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cisa_csaf_ot nvd NVD CVE.org MITRE

published 2021-08-05modified 2026-06-17

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+257 more

references (11)

External citations — patches, advisories, analysis.

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