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CVE Record

CVE-2020-5644: Buffer overflow vulnerability in TCP/IP function included in the firmware of GT14 Model of GOT 1000 series...

Buffer overflow vulnerability in TCP/IP function included in the firmware of GT14 Model of GOT 1000 series (GT1455-QTBDE CoreOS version "05.65.00.BD" and earlier, GT1450-QMBDE CoreOS version "05.65.00.BD" and earlier, GT1450-QLBDE CoreOS version "05.65.00.BD" and earlier, GT1455HS-QTBDE CoreOS version "05.65.00.BD" and earlier, and GT1450HS-QMBDE CoreOS version "05.65.00.BD" and earlier) allows a remote unauthenticated attacker to stop the network functions of the products or execute a malicious program via a specially crafted packet.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2020-5644 is a buffer overflow in the TCP/IP firmware function of specific Mitsubishi Electric GT14 GOT1000 operator terminals. A remote unauthenticated attacker could disrupt network functions or run a malicious program by sending a crafted packet. This matters most where these HMIs are reachable from broader plant or enterprise networks.

Executive priority

Treat as high priority for OT environments using the listed GT14 devices, especially where HMIs are network-reachable beyond tightly controlled plant segments. The business concern is operational disruption and possible code execution on industrial interface equipment, not broad enterprise endpoint exposure.

Technical view

The issue affects listed GT14 GOT1000 models running CoreOS version 05.65.00.BD and earlier. The vulnerable TCP/IP firmware function can be triggered remotely without authentication using a crafted packet, with stated impacts of network-function stoppage or malicious program execution. No CVSS, CWE, patch version, or detailed workaround is present in the provided bundle.

Likely exposure

Exposure is likely limited to organizations using the named Mitsubishi Electric GT14 GOT1000 models. Risk rises materially if device network services are reachable from non-OT networks, vendor remote-access paths, or untrusted segments. The provided bundle does not establish internet exposure or affected successor product lines.

Exploitation context

The source bundle does not show CISA KEV listing or any cited evidence of active exploitation. The vulnerability is still serious because it is remote, unauthenticated, and affects industrial HMI firmware where loss of network functions can disrupt operations.

Researcher notes

The provided evidence identifies affected models, firmware threshold, attacker position, and impact, but omits CVSS, CWE, proof-of-concept status, exploit prevalence, and exact fixed version. Avoid broad product assumptions; validate only the named GT14 GOT1000 models and firmware versions.

Mitigation direction

  • Review Mitsubishi Electric PSIRT advisory 2020-014 for official update or workaround guidance.
  • Identify and prioritize affected GT14 devices running CoreOS 05.65.00.BD or earlier.
  • Remove affected device interfaces from untrusted or unnecessary network reachability.
  • Restrict access to required OT hosts and approved maintenance paths only.
  • Monitor for unexpected loss of GOT network functions or abnormal restarts.

Validation and detection

  • Inventory GOT1000 GT14 model numbers across OT sites and maintenance spares.
  • Record CoreOS versions for GT1455-QTBDE, GT1450-QMBDE, GT1450-QLBDE, GT1455HS-QTBDE, and GT1450HS-QMBDE.
  • Map which networks can reach the affected device TCP/IP services.
  • Confirm remediation status against Mitsubishi Electric PSIRT advisory 2020-014.
  • Check incident logs for unexplained HMI network-function failures.
Prepared
Confidence
medium
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
5Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Mitsubishi Electric CorporationGT14 Model of GOT 1000 series(GT1455-QTBDE CoreOS version ’05.65.00.BD’ and earlier, GT1450-QMBDE CoreOS version ’05.65.00.BD’ and earlier, GT1450-QLBDE CoreOS version ’05.65.00.BD’ and earlier, GT1455HS-QTBDE CoreOS version ’05.65.00.BD’ and earlier, and GT1450HS-QMBDE CoreOS version ’05.65.00.BD’ and earlier)Listed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.