# CVE-2021-22681: Rockwell Multiple Products Insufficient Protected Credentials Vulnerability

> CVE-2021-22681: Rockwell Multiple Products Insufficient Protected Credentials Vulnerability. CVSS 9.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2021-22681
Last updated: 2026-06-17T03:37:34Z

- Published: 2021-03-03 17:59 UTC · Updated: 2026-06-17 03:37 UTC · Assigner: icscert
- CVSS: 9.8 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS: 63.6%, 99th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2026-03-05, federal due date 2026-03-26, ransomware use: Unknown
- CWE: CWE-522

## 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 required action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

## Affected vendors and products

- n/a: Rockwell Automation Studio 5000 Logix Designer, RSLogix 5000, Logix Controllers

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2021-22681)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2021-22681)
- [https://us-cert.cisa.gov/ics/advisories/icsa-21-056-03](https://us-cert.cisa.gov/ics/advisories/icsa-21-056-03)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2021-22681 · Markdown: https://rewindex.com/cve/CVE-2021-22681.md · JSON: https://rewindex.com/api/v1/cves/CVE-2021-22681 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T04:04:42.379Z