Skip to content
Fencer Vulns
high 7.5

CVE-2021-20589 json

Buffer access with incorrect length value vulnerability in GOT2000 series GT27 model communication driver versions 01.19.000 through 01.38.…

published 2021-05-19 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-8007

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.5%
EPSS 1.5% chance of exploitation in 30 days, percentile 74%
public exploits
0
none known

Summary

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.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-21-131-02 updated cvss 5.9

Mitsubishi Electric GOT and Tension Controller (Update A)

  • Mitsubishi Electric GS21 model >= 01.21.000, <= 01.39.000 Mitsubishi Electric GT SoftGOT2000 >= 1.170C, <= 1.250L Mitsubishi Electric GT21 model >= 01.21.000, <= 01.39.000 Mitsubishi Electric GT23 model >= 01.19.000, <= 01.38.000 Mitsubishi Electric GT25 model >= 01.19.000, <= 01.38.000 Mitsubishi Electric GT27 model >= 01.19.000, <= 01.38.000
    +1 more products
    Mitsubishi Electric LE7-40GU-L Screen package data for MODBUS/TCP 1
    affected: fixed in 01.40.000, mitigation “GOT2000 series: GT27 model, GT25 model, and GT23 model: update to 01.39.000 or later.” mitsubishielectric.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

1.48% chance of exploitation in the next 30 days, higher than 74% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

  • n/a GOT2000 series; GOT SIMPLE series; GT SoftGOT2000; Tension Controller

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.