CVE-2021-22681

9.8

CVSS
Critical

PUBLISHED

Rockwell Automation Studio 5000 Logix Designer Versions 21 and later, and RSLogix 5000 Versions 16 through 20 use a key to verify Logix controllers...

1 day faster than CISA KEV

Exploited in the wild Remote Low complexity No user interaction

Vendor: Rockwell Automation
Product: Studio 5000 Logix Designer, RSLogix 5000
Published: Mar 03, 2021
EPSS: 18.2% · 95% pctl

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Description

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 communicating with Rockwell Automation CompactLogix 1768, 1769, 5370, 5380, 5480: ControlLogix 5550, 5560, 5570, 5580; DriveLogix 5560, 5730, 1794-L34; Compact GuardLogix 5370, 5380; GuardLogix 5570, 5580; SoftLogix 5800. Rockwell Automation Studio 5000 Logix Designer Versions 21 and later and RSLogix 5000: Versions 16 through 20 are vulnerable because an unauthenticated attacker could bypass this verification mechanism and authenticate with Rockwell Automation CompactLogix 1768, 1769, 5370, 5380, 5480: ControlLogix 5550, 5560, 5570, 5580; DriveLogix 5560, 5730, 1794-L34; Compact GuardLogix 5370, 5380; GuardLogix 5570, 5580; SoftLogix 5800.

cisa

Weaknesses (CWE)

CWE-522

Insufficiently Protected Credentials

CVSS scores

CVSS v3.1 9.8 Critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v2.0 7.5 High

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

Exploitation status

Exploited in the wild

Recorded 2026-06-01 11:38:00 UTC · CVE

References

https://us-cert.cisa.gov/ics/advisories/icsa-21-056-03

Known exploited vulnerability sources

Catalogues that list this CVE as a known exploited vulnerability.

Source	Added
CVE First	2026-06-01 11:38 UTC
CISA	2026-06-02 14:02 UTC

Vulnerability detail