CVE-2021-20596 Null dereference in MELSEC-F Series FX3U-ENET; FX3U-ENET-L; FX3U-ENET-P502
Remote unauthenticated attackers can cause a denial of service in Mitsubishi MELSEC-F series PLC 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-2021-20596?
CVE-2021-20596 is a high-severity vulnerability in MELSEC-F Series FX3U-ENET; FX3U-ENET-L; FX3U-ENET-P502, published on 22 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
NULL Pointer Dereference in MELSEC-F Series FX3U-ENET firmware version 1.14 and prior, FX3U-ENET-L firmware version 1.14 and prior and FX3U-ENET-P502 firmware version 1.14 and prior allows a remote unauthenticated attacker to cause a DoS condition in communication by sending specially crafted packets. Control by MELSEC-F series PLC is not affected and system reset is required for recovery.
Weakness: CWE-476
Which versions are affected by CVE-2021-20596?
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-2021-20596?
No fix has been published for CVE-2021-20596 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-20596 being exploited?
There is no known exploitation of CVE-2021-20596 in the wild and no public exploit code.
Other vulnerabilities in MELSEC-F Series FX3U-ENET; FX3U-ENET-L; FX3U-ENET-P502
Sources
Also known as GHSA-wrr3-chw5-r88x.