CVE-2021-20597

—

CVSS 3.1

9.1 critical

EPSS

2%p82

Published

Aug 6, 2021 (Aug 6, 2021)

Modified

Jun 17, 2026

Description

Insufficiently Protected Credentials vulnerability in Mitsubishi Electric MELSEC iQ-R series Safety CPU modules R08/16/32/120SFCPU firmware versions "26" and prior and Mitsubishi Electric MELSEC iQ-R series SIL2 Process CPU modules R08/16/32/120PSFCPU firmware versions "11" and prior allows a remote unauthenticated attacker to login to the target unauthorizedly by sniffing network traffic and obtaining credentials when registering user information in the target or changing a password.

Vendors: mitsubishielectric
Products: r08sfcpu firmware, r16sfcpu firmware, r32sfcpu firmware, r120sfcpu firmware, r08psfcpu firmware, r16psfcpu firmware, r32psfcpu firmware, r120psfcpu firmware
Weakness: CWE-522
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

NVD CVE.org GitHub PoCs EPSS (2.2%)

In the news1 stories

Unpatched Security Flaws Expose Mitsubishi Safety PLCs to Remote Attacks

The Hacker NewsAug 6, 10:25 UTC · Aug 6, 2021Vulnerability CVE-2021-20594 CVE-2021-20598 CVE-2021-20597