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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.17%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 2.17% probability · 81th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Affected
- mitsubishielectric/fx3u-enet-l firmware · mitsubishielectric/fx3u-enet-p502 firmware · mitsubishielectric/fx3u-enet firmware
- Source
- Mitsubishielectric.Psirt@yd.MitsubishiElectric.co.jp
References
- https://jvn.jp/vu/JVNVU94348759/index.htmlPatch, Third Party Advisory
- https://us-cert.cisa.gov/ics/advisories/icsa-21-201-01Third Party Advisory
- https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-006_en.pdfPatch, Vendor Advisory
- https://jvn.jp/vu/JVNVU94348759/index.htmlPatch, Third Party Advisory
- https://us-cert.cisa.gov/ics/advisories/icsa-21-201-01Third Party Advisory
- https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-006_en.pdfPatch, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.