Risk Letters

Exploited vulnerability

CVE-2021-22681

TLP:CLEAR

Rockwell Multiple Products Insufficient Protected Credentials Vulnerability

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.

Facts

  • Vendor: Rockwell
  • Product: Multiple Products
  • CVSS: 9.8
  • EPSS (probability of exploitation within 30 days): 63.6 %
  • On CISA's Known Exploited Vulnerabilities list since: 5 March 2026
  • First known exploitation: 5 March 2026
  • CISA's deadline for US federal agencies: 26 March 2026
  • Weakness: CWE-522
  • First seen by Risk Letters: 5 March 2026

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD