NULL pointer dereference in Mitsubishielectric Fx3u-Enet Firmware
CVE-2021-20596
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.022 (81.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 81.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.022 · newest: 0.022 · change: 0.000
Affected products
- Mitsubishielectric Fx3u-Enet Firmware
- Mitsubishielectric Fx3u-Enet-L Firmware
- Mitsubishielectric Fx3u-Enet-P502 Firmware
- Melsec-F Series Fx3u-Enet; Fx3u-Enet-L; Fx3u-Enet-P502 — versions Firmware version 1.14 and prior
Weakness classification (CWE)
References
- www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-006_en.pdf (Patch, Vendor Advisory)
- jvn.jp/vu/JVNVU94348759/index.html (Patch, Third Party Advisory)
- us-cert.cisa.gov/ics/advisories/icsa-21-201-01 (Third Party Advisory)
Frequently asked questions
- What is CVE-2021-20596?
- CVE-2021-20596 is a high-severity vulnerability in Mitsubishielectric Fx3u-Enet Firmware, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2021-07-22.
- How severe is CVE-2021-20596?
- High severity. CVSS v3 base score is 7.5 out of 10.