CVE-2023-49140: Denial-of-service (DoS) vulnerability exists in commplex-link service of HMI GC-A2 series

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HIGH 7.5REMOTEMITIGATEMITIGATEMITIGATE

CVE-2023-49140 is a high-severity flaw (CVSS 7.5) affecting gc-a22w-cw firmware, gc-a24w-c\(w\) firmware, gc-a26w-c\(w\) firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Denial-of-service (DoS) vulnerability exists in commplex-link service of HMI GC-A2 series. If a remote unauthenticated attacker sends a specially crafted packets to specific ports, a denial-of-service (DoS) condition may occur.

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 38%)
CISA exploited list	No
Weakness	CWE-400
Published	2023-12-12
Last modified	2026-06-17

Publisher (CNA): JPCERT/CC · Vendor: jtekt

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-12-12 10:15 UTCPublished CVE record published
2026-06-17 06:35 UTCUpdated Record last modified

jtekt gc-a22w-cw firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

jtekt gc-a24w-c\(w\) firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

jtekt gc-a26w-c\(w\) firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

jtekt gc-a24 firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

jtekt gc-a24-m firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

jtekt gc-a25 firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-49140?

gc-a22w-cw firmware: mitigate or apply the listed mitigation; gc-a24w-c\(w\) firmware: mitigate or apply the listed mitigation; gc-a26w-c\(w\) firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-49140 being exploited?

CVE-2023-49140 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-49140 affect?

CVE-2023-49140 affects gc-a22w-cw firmware, gc-a24w-c\(w\) firmware, gc-a26w-c\(w\) firmware. Severity is high (CVSS 7.5). Denial-of-service (DoS) vulnerability exists in commplex-link service of HMI GC-A2 series. If a remote unauthenticated attacker sends a specially crafted packets to specific ports, a denial-of-service (DoS) condition may occur.

How urgent is CVE-2023-49140?

Priority 47/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-49713 HIGH 7.5 MITIGATE MITIGATE Denial-of-service (DoS) vulnerability exists in NetBIOS service of HMI GC-A2 series
CVE-2023-49143 HIGH 7.5 MITIGATE MITIGATE Denial-of-service (DoS) vulnerability exists in rfe service of HMI GC-A2 series
CVE-2023-41963 HIGH 7.5 MITIGATE MITIGATE Denial-of-service (DoS) vulnerability exists in FTP service of HMI GC-A2 series

References

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