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No exploitation reported

CVE-2021-20601

No exploitation reported by the sources we read.

  • Published2021-11-23
  • WeaknessCWE-20

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

Improper input validation vulnerability in GOT2000 series GT27 model all versions, GOT2000 series GT25 model all versions, GOT2000 series GT23 model all versions, GOT2000 series GT21 model all versions, GOT SIMPLE series GS21 model all versions, and GT SoftGOT2000 all versions allows an remote unauthenticated attacker to write a value that exceeds the configured input range limit by sending a malicious packet to rewrite the device value. As a result, the system operation may be affected, such as malfunction.

Timeline

dates in UTC
  1. 2021-11-2315:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 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-2021-20601?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-20601?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Mitsubishielectric got simple gs2107-wtbd firmwareversion to verify
BranchAffectedFixed in
—all versionsno fix published
Mitsubishielectric got simple gs2110-wtbd firmwareversion to verify
BranchAffectedFixed in
—all versionsno fix published
Mitsubishielectric got2000 gt2103-pmbd firmwareversion to verify
BranchAffectedFixed in
—all versionsno fix published

47 more products 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-21-320-02 CISA6 known affected

    Mitsubishi Electric GOT products

    GT25 model: All versions · GT27 model: All versions · GT23 model: All versions · +3 more

Full record on NVD

Fix

  1. Mitigation from the vendor CISA ICSA-21-320-02 · 6 productsMitsubishi Electric recommends users take measures such as installing a firewall to protect the GOT and system from unauthorized access from external equipment via the network.
  2. Mitigation from the vendor CISA ICSA-21-320-02 · 6 productsUse a firewall or virtual private network (VPN), etc. to prevent unauthorized access when Internet access is required.
  3. Mitigation from the vendor CISA ICSA-21-320-02 · 6 productsUse the products within a LAN and block access from untrusted networks and hosts.
  4. Mitigation from the vendor CISA ICSA-21-320-02 · 6 productsInstall antivirus software on user computers with access to the product and the system.
  5. Mitigation from the vendor CISA ICSA-21-320-02 · 6 productsUse the IP filter function to restrict the accessible IP addresses.
  6. Mitigation from the vendor CISA ICSA-21-320-02 · 6 productsFor more information, please contact the local Mitsubishi Electric representative or refer to the Mitsubishi Electric support website.

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • NVDCVSS 3.17.5read 2026-10-23
  • NVDCVSS 2.07.8read 2026-10-23
  • NVDweakness (CWE)CWE-20read 2026-10-23
  • FIRST EPSSEPSS score2.4 %2026-10-23

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Published
2021-11-23
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2021-20601?

Improper input validation vulnerability in GOT2000 series GT27 model all versions, GOT2000 series GT25 model all versions, GOT2000 series GT23 model all versions, GOT2000 series GT21 model all versions, GOT SIMPLE series GS21 model all versions, and GT SoftGOT2000 all versions allows an remote unauthenticated attacker to write a value that exceeds the configured input range limit by sending a malicious packet to rewrite the device value. As a result, the system operation may be affected, such as malfunction.

Is CVE-2021-20601 actively exploited?

Active exploitation of CVE-2021-20601 has not been confirmed. Its EPSS score was 2.4% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-20601?

CVE-2021-20601 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:H/A:N.

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