Vulnerability · Published Jul 22, 2021 · Assigned by Mitsubishi
CVE-2021-20596
High 7.5
In plain English
A high-severity security flaw in MELSEC-F Series FX3U-ENET; FX3U-ENET-L; FX3U-ENET-P502. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.2% (higher than 82% of all known vulnerabilities).
Severity (CVSS NVD)7.5High
Exploit odds (30 days)2.2%top 17.6% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| n/a | MELSEC-F Series FX3U-ENET; FX3U-ENET-L; FX3U-ENET-P502 | Firmware version 1.14 and prior |
References
- https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-006_en.pdf x_refsource_MISC
- https://jvn.jp/vu/JVNVU94348759/index.html x_refsource_MISC
- https://us-cert.cisa.gov/ics/advisories/icsa-21-201-01 x_refsource_MISC