CVE-2020-5652 Denial of service in MELSEC iQ-R, Q and L series
Remote unauthenticated attackers can cause denial of service on Mitsubishi MELSEC PLCs by sending specially crafted packets to the Ethernet port.
- 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-2020-5652?
CVE-2020-5652 is a high-severity denial of service vulnerability in Mitsubishi Electric Corporation MELSEC iQ-R, Q and L series, published on 30 Oct 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Uncontrolled resource consumption vulnerability in Ethernet Port on MELSEC iQ-R, Q and L series CPU modules (R 00/01/02 CPU firmware versions '20' and earlier, R 04/08/16/32/120 (EN) CPU firmware versions '52' and earlier, R 08/16/32/120 SFCPU firmware versions '22' and earlier, R 08/16/32/120 PCPU all versions, R 08/16/32/120 PSFCPU all versions, R 16/32/64 MTCPU all versions, Q03 UDECPU, Q 04/06/10/13/20/26/50/100 UDEHCPU serial number '22081' and earlier , Q 03/04/06/13/26 UDVCPU serial number '22031' and earlier, Q 04/06/13/26 UDPVCPU serial number '22031' and earlier, Q 172/173 DCPU all versions, Q 172/173 DSCPU all versions, Q 170 MCPU all versions, Q 170 MSCPU all versions, L 02/06/26 CPU (-P) and L 26 CPU - (P) BT all versions) allows a remote unauthenticated attacker to stop the Ethernet communication functions of the products via a specially crafted packet, which may lead to a denial of service (DoS) condition .
Weakness: CWE-400
Which versions are affected by CVE-2020-5652?
It affects 51 products.
Products include Mitsubishielectric Melsec Iq-R00cpu Firmware, Mitsubishielectric Melsec Iq-R01cpu Firmware, Mitsubishielectric Melsec Iq-R02cpu Firmware, Mitsubishielectric Melsec Iq-R04encpu Firmware, Mitsubishielectric Melsec Iq-R08encpu Firmware, Mitsubishielectric Melsec Iq-R08pcpu Firmware and 45 more.
How do I fix CVE-2020-5652?
No fix has been published for CVE-2020-5652 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-2020-5652 being exploited?
There is no known exploitation of CVE-2020-5652 in the wild and no public exploit code.
Other vulnerabilities in Mitsubishi Electric Corporation MELSEC iQ-R, Q and L series
Sources
Also known as GHSA-cpv9-4hm5-jjhj.