CVE-2021-20611 Denial of service in MELIPC Series MI5122-VW
Remote unauthenticated attackers can cause a denial-of-service condition on Mitsubishi PLCs by sending specially crafted packets, requiring a system reset to recover.
- 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-2021-20611?
CVE-2021-20611 is a high-severity denial of service vulnerability in Mitsubishi Electric Corporation MELIPC Series MI5122-VW, published on 1 Dec 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Improper Input Validation vulnerability in Mitsubishi Electric MELSEC iQ-R Series R00/01/02CPU, MELSEC iQ-R Series R04/08/16/32/120(EN)CPU, MELSEC iQ-R Series R08/16/32/120SFCPU, MELSEC iQ-R Series R08/16/32/120PCPU, MELSEC iQ-R Series R08/16/32/120PSFCPU, MELSEC iQ-R Series R16/32/64MTCPU, MELSEC iQ-R Series R12CCPU-V, MELSEC Q Series Q03UDECPU, MELSEC Q Series Q04/06/10/13/20/26/50/100UDEHCPU, MELSEC Q Series Q03/04/06/13/26UDVCPU, MELSEC Q Series Q04/06/13/26UDPVCPU, MELSEC Q Series Q12DCCPU-V, MELSEC Q Series Q24DHCCPU-V(G), MELSEC Q Series Q24/26DHCCPU-LS, MELSEC Q Series MR-MQ100, MELSEC Q Series Q172/173DCPU-S1, MELSEC Q Series Q172/173DSCPU, MELSEC Q Series Q170MCPU, MELSEC Q Series Q170MSCPU(-S1), MELSEC L Series L02/06/26CPU(-P), MELSEC L Series L26CPU-(P)BT and MELIPC Series MI5122-VW allows a remote unauthenticated attacker to cause a denial-of-service (DoS) condition by sending specially crafted packets. System reset is required for recovery.
Weakness: CWE-20
Which versions are affected by CVE-2021-20611?
It affects 55 products.
Products include Mitsubishi Melipc Mi5122-Vw Firmware, Mitsubishi Melsec Iq-R R00 Cpu Firmware, Mitsubishi Melsec Iq-R R01 Cpu Firmware, Mitsubishi Melsec Iq-R R02 Cpu Firmware, Mitsubishi Melsec Iq-R R04 Cpu Firmware, Mitsubishi Melsec Iq-R R04 Pcpu Firmware and 49 more.
How do I fix CVE-2021-20611?
No fix has been published for CVE-2021-20611 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-2021-20611 being exploited?
There is no known exploitation of CVE-2021-20611 in the wild and no public exploit code.
Other vulnerabilities in Mitsubishi Electric Corporation MELIPC Series MI5122-VW
Sources
Also known as GHSA-pmj6-jq7v-c2r6.