CVE-2019-10977 — In Mitsubishi Electric MELSEC-Q series Ethernet module QJ71E71-100 serial number

In Mitsubishi Electric MELSEC-Q series Ethernet module QJ71E71-100 serial number 20121 and prior, an attacker could send crafted TCP packets against the FTP service, forcing the target devices to enter an error mode and cause a denial-of-service condition.

01What is this vulnerability?

In Mitsubishi Electric MELSEC-Q series Ethernet module QJ71E71-100 serial number 20121 and prior, an attacker could send crafted TCP packets against the FTP service, forcing the target devices to enter an error mode and cause a denial-of-service condition.

02Affected products

Vendor	Product	Versions
Mitsubishi Electric	MELSEC	Q series Ethernet module — QJ71E71-100 serial number 20121 and prior

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2019-05-23T13:28:22.000Z
• Last modified: 2024-08-04T22:40:15.601Z

09References

• ics-cert.us-cert.gov — https://ics-cert.us-cert.gov/advisories/ICSA-19-141-02
• www.securityfocus.com — http://www.securityfocus.com/bid/108419