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Fencer Intel
high 7.5

CVE-2021-20590 json

Improper authentication vulnerability in GOT2000 series GT27 model VNC server versions 01.39.010 and prior, GOT2000 series GT25 model VNC s…

published 5y ago modified 4mo ago also EUVD-2021-8008

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 70%
public exploits
0
none known

Summary

Improper authentication vulnerability in GOT2000 series GT27 model VNC server versions 01.39.010 and prior, GOT2000 series GT25 model VNC server versions 01.39.010 and prior, GOT2000 series GT21 model GT2107-WTBD VNC server versions 01.40.000 and prior, GOT2000 series GT21 model GT2107-WTSD VNC server versions 01.40.000 and prior, GOT SIMPLE series GS21 model GS2110-WTBD-N VNC server versions 01.40.000 and prior and GOT SIMPLE series GS21 model GS2107-WTBD-N VNC server versions 01.40.000 and prior allows a remote unauthenticated attacker to gain unauthorized access via specially crafted packets when the "VNC server" function is used.

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Vendor advisories

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

cisa ICSA-21-112-02 updated cvss 5.9

Mitsubishi Electric GOT (Update A)

  • Mitsubishi Electric GS2107-WTBD-N VNC server <= 01.40.000 Mitsubishi Electric GS2110-WTBD-N VNC server <= 01.40.000 Mitsubishi Electric GT25 model VNC server <= 01.39.010 Mitsubishi Electric GT27 model VNC server <= 01.39.010 Mitsubishi Electric GT2107-WTBD VNC server <= 01.40.000 Mitsubishi Electric GT2107-WTSD VNC server <= 01.40.000
    affected: mitigation “Mitsubishi Electric instructs users to restrict access to the product only from trusted networks and hosts until they can update”

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

1.28% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-09).

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:H/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Affected products

  • n/a GOT2000 series GT27 model
  • n/a GOT2000 series GT25 model
  • n/a GOT2000 series GT21 model GT2107-WTBD
  • n/a GOT2000 series GT21 model GT2107-WTSD
  • n/a GOT SIMPLE series GS21 model GS2110-WTBD-N
  • n/a GOT SIMPLE series GS21 model GS2107-WTBD-N

Classification

Weakness

References

Sources

Fencer Intel 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.