CVE-2020-5527 Denial of service in MELSOFT transmission port (UDP/IP) of multiple Mitsubishi Electric MELSEC series
Attackers can cause denial of service in Mitsubishi Electric MELSEC PLCs by sending massive data to the MELSOFT transmission port, disrupting industrial operations.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-5527?
CVE-2020-5527 is a high-severity denial of service vulnerability in MELSOFT transmission port (UDP/IP) of multiple Mitsubishi Electric MELSEC series, published on 30 Mar 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
When MELSOFT transmission port (UDP/IP) of Mitsubishi Electric MELSEC iQ-R series (all versions), MELSEC iQ-F series (all versions), MELSEC Q series (all versions), MELSEC L series (all versions), and MELSEC F series (all versions) receives massive amount of data via unspecified vectors, resource consumption occurs and the port does not process the data properly. As a result, it may fall into a denial-of-service (DoS) condition. The vendor states this vulnerability only affects Ethernet communication functions.
Weakness: CWE-400
Which versions are affected by CVE-2020-5527?
It affects 46 products.
Products include Mitsubishielectric Cr800-Q Firmware, Mitsubishielectric Fx3g Firmware, Mitsubishielectric Fx3gc Firmware, Mitsubishielectric Fx3s Firmware, Mitsubishielectric Fx3u Firmware, Mitsubishielectric Fx3uc Firmware and 40 more.
How do I fix CVE-2020-5527?
No fix has been published for CVE-2020-5527 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2020-5527 being exploited?
There is no known exploitation of CVE-2020-5527 in the wild and no public exploit code.
Sources
Also known as GHSA-5jq2-477f-97vj.