CVE-2021-20598

—

CVSS 3.1

5.3 medium

EPSS

2%p73

Published

Aug 6, 2021 (Aug 6, 2021)

Modified

Jun 17, 2026

Description

Overly Restrictive Account Lockout Mechanism vulnerability in Mitsubishi Electric MELSEC iQ-R series CPU modules (R08/16/32/120SFCPU all versions, R08/16/32/120PSFCPU all versions) allows a remote unauthenticated attacker to lockout a legitimate user by continuously trying login with incorrect password.

Vendors: mitsubishielectric
Products: r08sfcpu firmware, r16sfcpu firmware, r32sfcpu firmware, r120sfcpu firmware, r08psfcpu firmware, r16psfcpu firmware, r32psfcpu firmware, r120psfcpu firmware
Weakness: CWE-287
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

NVD CVE.org GitHub PoCs EPSS (1.5%)

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