CVE-2021-20590

mediumpriority · track · 30EPSS 0.013 · 70 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.27% (70th) EPSS

CVSS 4.3 · medium

Is it mine?

32 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · cisa_csaf_ot

EPSS · scored 2026-10-27

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.

remediations

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

No vendor fix yet; a mitigation is available.

MitigationGS2107-WTBD-N VNC servercisa_csaf_ot
GS2107-WTBD-N: VNC server Version 01.41.000 or later
MitigationGS2110-WTBD-N VNC servercisa_csaf_ot
GS2107-WTBD-N: VNC server Version 01.41.000 or later
MitigationGT2107-WTBD VNC servercisa_csaf_ot
GS2107-WTBD-N: VNC server Version 01.41.000 or later
MitigationGT2107-WTSD VNC servercisa_csaf_ot
GS2107-WTBD-N: VNC server Version 01.41.000 or later
MitigationGT25 model VNC servercisa_csaf_ot
GS2107-WTBD-N: VNC server Version 01.41.000 or later
MitigationGT27 model VNC servercisa_csaf_ot
GS2107-WTBD-N: VNC server Version 01.41.000 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 · 4.3–7.5

v2.04.3mediumAV:N/AC:M/Au:N/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 8.6 · impact 2.9

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Nprimary · 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:H/A:Nsecondary · CISA US

v3.15.9mediumAV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:Nsecondary · FSTEC (BDU) RU

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

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-287USprimaryCWE-287USCWE-287US

affected products (32)

Products and version ranges known to be affected.

GS2107-WTBD-N VNC server: Versions 01.40.000 and priorall versionscisa_csaf_otUS
GS2110-WTBD-N VNC server: Versions 01.40.000 and priorall versionscisa_csaf_otUS
GT2107-WTBD VNC server: Versions 01.40.000 and priorall versionscisa_csaf_otUS
GT2107-WTSD VNC server: Versions 01.40.000 and priorall versionscisa_csaf_otUS
GT25 model VNC server: Versions 01.39.010 and priorall versionscisa_csaf_otUS
GT27 model VNC server: Versions 01.39.010 and priorall versionscisa_csaf_otUS
Mitsubishi Electric GS2107-WTBD-N VNC server≤ 01.40.000cisa_csaf_otUS
Mitsubishi Electric GS2110-WTBD-N VNC server≤ 01.40.000cisa_csaf_otUS
Mitsubishi Electric GT2107-WTBD VNC server≤ 01.40.000cisa_csaf_otUS
Mitsubishi Electric GT2107-WTSD VNC server≤ 01.40.000cisa_csaf_otUS
Mitsubishi Electric GT25 model VNC server≤ 01.39.010cisa_csaf_otUS
Mitsubishi Electric GT27 model VNC server≤ 01.39.010cisa_csaf_otUS
n/a GOT SIMPLE series GS21 model GS2107-WTBD-N≤ VNC server version 01.40.000 and priorenisa_euvdEU
n/a GOT SIMPLE series GS21 model GS2110-WTBD-N≤ VNC server version 01.40.000 and priorenisa_euvdEU
n/a GOT2000 Series GT25 model≤ VNC server version 01.39.010 and priorenisa_euvdEU
n/a GOT2000 Series GT27 model≤ VNC server version 01.39.010 and priorenisa_euvdEU
n/a GOT2000 series GT21 model GT2107-WTBD≤ VNC server version 01.40.000 and priorenisa_euvdEU
n/a GOT2000 series GT21 model GT2107-WTSD≤ VNC server version 01.40.000 and priorenisa_euvdEU
Mitsubishi Electric Corporation GS21all versionsfstec_bduRU
Mitsubishi Electric Corporation GS2107-WTBD-Nall versionsfstec_bduRU

showing 20 of 32

advisories (1)

Vendor and ecosystem advisories describing this.

ICSA-21-112-02Mitsubishi Electric GOT (Update A)2021-04-22icsa · cisa_csaf_otUS
Successful exploitation of this vulnerability may allow an attacker to gain unauthorized access.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cisa_csaf_ot NVD CVE.org MITRE

published 2021-04-22modified 2026-06-17

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+7709 more

references (10)

External citations — patches, advisories, analysis.

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