PT-2022-9192 · Mitsubishi · Melsec-F Series Fx3U-Enet-P502+1

Published 2022-01-14 · Updated 2023-08-08 · CVE-2021-20612

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions MELSEC-F series FX3U-ENET Firmware versions 1.14 and prior MELSEC-F series FX3U-ENET-L Firmware versions 1.14 and prior MELSEC-F series FX3U-ENET-P502 Firmware versions 1.14 and prior

Description The issue is related to a lack of administrator control over security vulnerability, allowing a remote unauthenticated attacker to cause a denial-of-service (DoS) condition in the communication function of the product or other unspecified effects by sending specially crafted packets to an unnecessary opening of a TCP port. Control by MELSEC-F series PLC is not affected by this issue, but a system reset is required for recovery.

Recommendations For MELSEC-F series FX3U-ENET Firmware versions 1.14 and prior, update to a version later than 1.14 to resolve the issue. For MELSEC-F series FX3U-ENET-L Firmware versions 1.14 and prior, update to a version later than 1.14 to resolve the issue. For MELSEC-F series FX3U-ENET-P502 Firmware versions 1.14 and prior, update to a version later than 1.14 to resolve the issue. As a temporary workaround, consider restricting access to the unnecessary opening of the TCP port until a patch is available.

Fix

Related Identifiers

CVE-2021-20612

Affected Products

Melsec-F Series Fx3U-Enet

Melsec-F Series Fx3U-Enet-P502

References · 6

• https://osv.dev/vulnerability/CVE-2021-20612 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-20612 · Security Note
• https://mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-023_en.pdf · Vendor Advisory
• https://cisa.gov/uscert/ics/advisories/icsa-22-013-01 · Note
• https://t.me/cibsecurity/35617 · Telegram Post
• https://jvn.jp/vu/JVNVU93268332/index.html · Note