CVE-2021-20589

mediumpriority · track · 31EPSS 0.015 · 74 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.48% (74th) EPSS

CVSS 5 · medium

Is it mine?

24 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · cisa_csaf_ot · nvd

EPSS · scored 2026-10-27

Buffer access with incorrect length value vulnerability in GOT2000 series GT27 model communication driver versions 01.19.000 through 01.38.000, GT25 model communication driver versions 01.19.000 through 01.38.000, GT23 model communication driver versions 01.19.000 through 01.38.000 and GT21 model communication driver versions 01.21.000 through 01.39.000, GOT SIMPLE series GS21 model communication driver versions 01.21.000 through 01.39.000, GT SoftGOT2000 versions 1.170C through 1.250L and Tension Controller LE7-40GU-L Screen package data for MODBUS/TCP V1.00 allows a remote unauthenticated attacker to stop the communication function of the products via specially crafted packets.

remediations

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

A vendor fix is available.

FixedGS21 modelcisa_csaf_ot
GOT2000 series: GT21 model: update to 01.40.000 or later.
FixedGT SoftGOT2000cisa_csaf_ot
GOT2000 series: GT21 model: update to 01.40.000 or later.
FixedGT21 modelcisa_csaf_ot
GOT2000 series: GT21 model: update to 01.40.000 or later.
FixedGT23 modelcisa_csaf_ot
GOT2000 series: GT21 model: update to 01.40.000 or later.
FixedGT25 modelcisa_csaf_ot
GOT2000 series: GT21 model: update to 01.40.000 or later.
FixedGT27 modelcisa_csaf_ot
GOT2000 series: GT21 model: update to 01.40.000 or later.
FixedLE7-40GU-L Screen package data for MODBUS/TCPcisa_csaf_ot
GOT2000 series: GT21 model: update to 01.40.000 or later.
MitigationGS21 modelcisa_csaf_ot
GOT SIMPLE series GS21 model: update to 01.40.000 or later.
MitigationGT SoftGOT2000cisa_csaf_ot
GOT SIMPLE series GS21 model: update to 01.40.000 or later.
MitigationGT21 modelcisa_csaf_ot
GOT SIMPLE series GS21 model: update to 01.40.000 or later.
MitigationGT23 modelcisa_csaf_ot
GOT SIMPLE series GS21 model: update to 01.40.000 or later.
MitigationGT25 modelcisa_csaf_ot
GOT SIMPLE series GS21 model: update to 01.40.000 or later.
MitigationGT27 modelcisa_csaf_ot
GOT SIMPLE series GS21 model: update to 01.40.000 or later.
MitigationLE7-40GU-L Screen package data for MODBUS/TCPcisa_csaf_ot
GOT SIMPLE series GS21 model: update to 01.40.000 or later.

cvss

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

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 10 · impact 2.9

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-119USprimaryCWE-805US

affected products (24)

Products and version ranges known to be affected.

GS21 model: Versions 01.21.000 - 01.39.000all versionscisa_csaf_otUS
GT SoftGOT2000: Versions 1.170C - 1.250Lall versionscisa_csaf_otUS
GT21 model: Versions 01.21.000 - 01.39.000all versionscisa_csaf_otUS
GT23 model: Versions 01.19.000 - 01.38.000all versionscisa_csaf_otUS
GT25 model: Versions 01.19.000 - 01.38.000all versionscisa_csaf_otUS
GT27 model: Versions 01.19.000 - 01.38.000all versionscisa_csaf_otUS
LE7-40GU-L Screen package data for MODBUS/TCP: v1.00all versionscisa_csaf_otUS
Mitsubishi Electric GS21 model01.21.000 | → 01.39.000cisa_csaf_otUS
Mitsubishi Electric GT SoftGOT20001.170C | → 1.250Lcisa_csaf_otUS
Mitsubishi Electric GT21 model01.21.000 | → 01.39.000cisa_csaf_otUS
Mitsubishi Electric GT23 model01.19.000 | → 01.38.000cisa_csaf_otUS
Mitsubishi Electric GT25 model01.19.000 | → 01.38.000cisa_csaf_otUS
Mitsubishi Electric GT27 model01.19.000 | → 01.38.000cisa_csaf_otUS
Mitsubishi Electric LE7-40GU-L Screen package data for MODBUS/TCPall versionscisa_csaf_otUS
n/a GOT2000 series; GOT SIMPLE series; GT SoftGOT2000; Tension Controller≤ GT SoftGOT2000 versions 1.170C through 1.250Lenisa_euvdEU
n/a GOT2000 series; GOT SIMPLE series; GT SoftGOT2000; Tension Controller≤ LE7-40GU-L Screen package data for MODBUS/TCP V1.00enisa_euvdEU
n/a GOT2000 series; GOT SIMPLE series; GT SoftGOT2000; Tension Controller≤ GT27 model communication driver versions 01.19.000 through 01.38.000, GT25 model communication driver versions 01.19.000 through 01.38.000, GT23 model communication driver versions 01.19.000 through 01.38.000, GT21 model communication driver versions 01.21.000 through 01.39.000enisa_euvdEU
n/a GOT2000 series; GOT SIMPLE series; GT SoftGOT2000; Tension Controller≤ GS21 model communication driver versions 01.21.000 through 01.39.000enisa_euvdEU
mitsubishi gs21 firmware01.21.000 → 01.39.000nvdUScpe:2.3:o:mitsubishi:gs21_firmware:*:*:*:*:*:*:*:*
mitsubishi gt softgot2000 firmware1.170c → 1.250lnvdUScpe:2.3:o:mitsubishi:gt_softgot2000_firmware:*:*:*:*:*:*:*:*

showing 20 of 24

advisories (1)

Vendor and ecosystem advisories describing this.

ICSA-21-131-02Mitsubishi Electric GOT and Tension Controller (Update A)2021-05-11icsa · cisa_csaf_otUS
Successful exploitation of this vulnerability may be able to stop the communication function of the products, requiring a reset to regain functionality.

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 2021-05-19modified 2026-06-17

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+21038 more

references (9)

External citations — patches, advisories, analysis.

scry

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