CVE-2021-20613 Denial of service in MELSEC-F series FX3U-ENET; MELSEC-F series FX3U-ENET-L; MELSEC-F series FX3U-ENET-P502
Remote unauthenticated attackers can cause a denial-of-service condition in Mitsubishi MELSEC-F series communication modules by sending specially crafted packets.
- 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-2021-20613?
CVE-2021-20613 is a high-severity denial of service vulnerability in MELSEC-F series FX3U-ENET; MELSEC-F series FX3U-ENET-L; MELSEC-F series FX3U-ENET-P502, published on 14 Jan 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Improper initialization vulnerability in MELSEC-F series FX3U-ENET Firmware version 1.16 and prior, FX3U-ENET-L Firmware version 1.16 and prior and FX3U-ENET-P502 Firmware version 1.16 and prior allows a remote unauthenticated attacker to cause a denial-of-service (DoS) condition in communication function of the product by sending specially crafted packets. Control by MELSEC-F series PLC is not affected by this vulnerability, but system reset is required for recovery.
Weakness: CWE-665
Which versions are affected by CVE-2021-20613?
It affects 3 products.
Products include Mitsubishielectric Fx3u-Enet-L Firmware, Mitsubishielectric Fx3u-Enet-P502 Firmware, Mitsubishielectric Fx3u-Enet Firmware.
How do I fix CVE-2021-20613?
No fix has been published for CVE-2021-20613 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-2021-20613 being exploited?
There is no known exploitation of CVE-2021-20613 in the wild and no public exploit code.
Other vulnerabilities in MELSEC-F series FX3U-ENET; MELSEC-F series FX3U-ENET-L; MELSEC-F series FX3U-ENET-P502
Sources
Also known as GHSA-4mv5-vjxv-hh3h.