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

criticalknown exploitedCVE-2021-22681
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Multiple Rockwell products contain an insufficient protected credentials vulnerability. Studio 5000 Logix Designer software may allow a key to be discovered. This key is used to verify Logix controllers are communicating with Rockwell Automation design software. If successfully exploited, this vulnerability could allow an unauthorized application to connect with Logix controllers. To leverage this vulnerability, an unauthorized user would require network access to the controller.

CSIRTS triage

vendor: RockwellOther
What
The vulnerability allows an unauthorized application to connect with Logix controllers due to insufficiently protected credentials.
Who is affected
Users with network access to Rockwell products are affected by this vulnerability.
Urgency
Remediation is critical as the vulnerability is actively exploited and poses significant risks.
Action
Implement security measures and update Rockwell products to the latest versions.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2026-03-05
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-22681

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-22681coverage & exploitation statusNVD · CVE.org

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