No exploitation reportedFix available

CVE-2021-20592

No exploitation reported by the sources we read.

Published2021-08-05
WeaknessCWE-662

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC

2021-08-0521:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-20592?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-20592?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Mitsubishielectric got2000 gt23 firmwareversion to verify

Branch	Affected	Fixed in	Source
1.x	≥ 01.19.000, ≤ 01.39.010	no fix published	NVD

Mitsubishielectric got2000 gt25 firmwareversion to verify

Branch	Affected	Fixed in	Source
1.x	≥ 01.19.000, ≤ 01.39.010	no fix published	NVD

Mitsubishielectric got2000 gt27 firmwareversion to verify

Branch	Affected	Fixed in	Source
1.x	≥ 01.19.000, ≤ 01.39.010	no fix published	NVD

1 more product in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-21-208-02 CISA2 known affected
Mitsubishi Electric GOT2000 series and GT SoftGOT2000
GOT2000 models GT27 GT25 GT23: All communication driver versions between 01.19.000 and 01.39.010 · GT SoftGOT2000: All versions between 1.170C and 1.256S

Full record on NVD

Fix

Vendor fix CISA ICSA-21-208-02 · 2 productsGT SoftGOT2000: Update to Version 1.26W or later
Mitigation from the vendor CISA ICSA-21-208-02 · 2 productsGOT2000 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)
Mitigation from the vendor CISA ICSA-21-208-02 · 2 productsFor specific update instructions and additional details see the Mitsubishi Electric advisory.
Mitigation from the vendor CISA ICSA-21-208-02 · 2 productsWhen connecting the products to the Internet, use a firewall or virtual private network (VPN), etc. to prevent unauthorized access.
Mitigation from the vendor CISA ICSA-21-208-02 · 2 productsUse the products within the LAN and block access from untrusted networks and hosts.
Mitigation from the vendor CISA ICSA-21-208-02 · 2 productsInstall antivirus software on your computer that can access the product.

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.17.5read 2026-10-23
NVDCVSS 2.07.8read 2026-10-23
NVDweakness (CWE)CWE-662read 2026-10-23
FIRST EPSSEPSS score1.5 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2021-08-05
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-20592?

Is CVE-2021-20592 actively exploited?

Active exploitation of CVE-2021-20592 has not been confirmed. Its EPSS score was 1.5% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-20592?

CVE-2021-20592 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Hear about the next vulnerability in your software

Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».

Get alerts for this product CISA KEV additions, October 2026 Search CVEs

No credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Following what attackers exploit right now? The CISA KEV additions of the month, with their patch deadlines.
Running this software? Vulnerability monitoring alerts you to new vulnerabilities in your products.

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database