CVE-2021-22681KEV · OVERDUECWE-522

Rockwell Multiple Products Insufficient Protected Credentials Vulnerability

Critical · published March 3, 2021

Patch now

Confirmed exploited, and the score agrees

CVSS calls it critical at 9.8. It is confirmed in active exploitation. It sits in the 99.2th percentile for exploit probability.

213
days past CISA
deadline
CVSS v3.1
9.8
EPSS
64%
Percentile
99.2
In the wild
Confirmed
What it is

🚨 An unauthenticated attacker can bypass key verification in Rockwell Automation Studio 5000, making it alarmingly simple to gain control over critical industrial systems. 🔥 Think of this vulnerability like a bouncer at an exclusive club who has forgotten how to check IDs—anyone can walk in and claim to be a VIP, no questions asked! This breach could allow a malicious actor to manipulate settings or execute commands on a wide range of Rockwell Automation controllers. The consequences are absolutely devastating, potentially leading to production downtime, safety hazards, or even unauthorized data access.

Put simply

Think of this vulnerability like a bouncer at an exclusive club who has forgotten how to check IDs—anyone can walk in and claim to be a VIP, no questions asked! CVE-2021-22681 exposes Rockwell Automation Studio 5000 Logix Designer and RSLogix 5000 due to inadequate ID verification for Logix controllers, enabling unauthenticated access to sensitive systems.

What to do

This breach could allow a malicious actor to manipulate settings or execute commands on a wide range of Rockwell Automation controllers. The consequences are absolutely devastating, potentially leading to production downtime, safety hazards, or even unauthorized data access. Immediately update to the latest versions of Studio 5000 Logix Designer and RSLogix 5000 that address this vulnerability. Ensure that all communication with controllers is secured and monitor for any unauthorized access attempts. You've got this! Follow these steps, and you'll have those systems locked down in no time. 🛡️

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.63630 · 99.2th percentile
Weakness
CWE-522 · Insufficiently Protected Credentials
Published
2021-03-03T17:59Z
KEV added
2026-03-05 · due 2026-03-26
EPSS history
Timeline
  • 05 MAR 00:00Z
    Added to CISA KEV — remediate by Mar 26
    kev
  • 03 MAR 17:59Z
    Rockwell Automation Studio 5000 Logix Designer Versions 21 and later, and RSLogix 5000 Versions 16 through 20 use a key to verify Logix controllers are…
    cvelistv5