CVE-2023-6374: Authentication Bypass by Capture-replay vulnerability in Mitsubishi Electric Corporation MELSEC WS Series WS0-

Routine

MEDIUM 5.9REMOTEMITIGATE

CVE-2023-6374 is a medium-severity flaw (CVSS 5.9) affecting melsec ws0-geth00200 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Authentication Bypass by Capture-replay vulnerability in Mitsubishi Electric Corporation MELSEC WS Series WS0-GETH00200 all serial numbers allows a remote unauthenticated attacker to bypass authentication by capture-replay attack and illegally login to the affected module. As a result, the remote attacker who has logged in illegally may be able to disclose or tamper with the programs and parameters in the modules.

Why this priority

Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 45%)
CISA exploited list	No
Weakness	CWE-294
Published	2024-01-30
Last modified	2026-06-17

Publisher (CNA): Mitsubishi Electric Corporation · Vendor: mitsubishielectric

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

Am I affected?

Timeline

2024-01-30 09:15 UTCPublished CVE record published
2026-06-17 06:50 UTCUpdated Record last modified

mitsubishielectric melsec ws0-geth00200 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-2023-6374?

melsec ws0-geth00200 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-6374 being exploited?

CVE-2023-6374 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-2023-6374 affect?

CVE-2023-6374 affects melsec ws0-geth00200 firmware. Severity is medium (CVSS 5.9). Authentication Bypass by Capture-replay vulnerability in Mitsubishi Electric Corporation MELSEC WS Series WS0-GETH00200 all serial numbers allows a remote unauthenticated attacker to bypass authentication by capture-replay attack and illega

How urgent is CVE-2023-6374?

Priority 39/100. Remotely exploitable, no login, no user action

Software pages

Mitsubishi Electric vulnerabilities

Related CVEs

CVE-2023-1618 HIGH 7.5 MITIGATE Active Debug Code vulnerability in Mitsubishi Electric Corporation MELSEC WS Series WS0-GETH00200 Serial numbe

References

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