CVE-2019-6535

Mitsubishi Electric MELSEC-Q Series PLCs Resource Exhaustion

Description

Mitsubishi Electric Q03/04/06/13/26UDVCPU: serial number 20081 and prior, Q04/06/13/26UDPVCPU: serial number 20081 and prior, and Q03UDECPU, Q04/06/10/13/20/26/50/100UDEHCPU: serial number 20101 and prior. A remote attacker can send specific bytes over Port 5007 that will result in an Ethernet stack crash and disruption to USB communication.

Remediation

Solution:

  • Mitsubishi Electric has produced a new version of the firmware. Additional information about this vulnerability or Mitsubishi Electric's compensating control is available by contacting a local Mitsubishi Electric representative, which can be found at the following location: https://us.mitsubishielectric.com/fa/en/about-us/distributors Mitsubishi Electric strongly recommends users should operate the affected device behind a firewall.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 1.28% Top 25%
Third-Party Advisory securityfocus.com Third-Party Advisory us-cert.gov
Affected: Mitsubishi Electric Q03/04/06/13/26UDVCPU
Affected: Mitsubishi Electric Q04/06/13/26UDPVCPU
Affected: Mitsubishi Electric Q03UDECPU, Q04/06/10/13/20/26/50/100UDEHCPU
Published at:
Updated at:

References

Link Tags
http://www.securityfocus.com/bid/106771 vdb entry third party advisory
https://www.cisa.gov/news-events/ics-advisories/icsa-19-029-02
https://ics-cert.us-cert.gov/advisories/ICSA-19-029-02 third party advisory us government resource

Frequently Asked Questions

What is the severity of CVE-2019-6535?
CVE-2019-6535 has been scored as a high severity vulnerability.
How to fix CVE-2019-6535?
To fix CVE-2019-6535: Mitsubishi Electric has produced a new version of the firmware. Additional information about this vulnerability or Mitsubishi Electric's compensating control is available by contacting a local Mitsubishi Electric representative, which can be found at the following location: https://us.mitsubishielectric.com/fa/en/about-us/distributors Mitsubishi Electric strongly recommends users should operate the affected device behind a firewall.
Is CVE-2019-6535 being actively exploited in the wild?
It is possible that CVE-2019-6535 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2019-6535?
CVE-2019-6535 affects Mitsubishi Electric Q03/04/06/13/26UDVCPU, Mitsubishi Electric Q04/06/13/26UDPVCPU, Mitsubishi Electric Q03UDECPU, Q04/06/10/13/20/26/50/100UDEHCPU.
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