CVE-2021-22681
highKEV · exploitedEPSS 0.636 · 99 %ileEURUUSadded 2026-03-05remediate by 2026-03-26
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.
EPSS · scored 2026-10-16
Rockwell Multiple Products Insufficient Protected Credentials Vulnerability
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.5–10
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (33)
Products and version ranges known to be affected.
- n/a Rockwell Automation Studio 5000 Logix Designer, RSLogix 5000, Logix Controllers≤ CompactLogix 1768, 1769, 5370, 5380, 5480enisa_euvdEU
- n/a Rockwell Automation Studio 5000 Logix Designer, RSLogix 5000, Logix Controllers≤ RSLogix 5000 Versions 16 through 20enisa_euvdEU
- n/a Rockwell Automation Studio 5000 Logix Designer, RSLogix 5000, Logix Controllers≤ Compact GuardLogix 5370, 5380enisa_euvdEU
- n/a Rockwell Automation Studio 5000 Logix Designer, RSLogix 5000, Logix Controllers≤ ControlLogix 5550, 5560, 5570, 5580enisa_euvdEU
- n/a Rockwell Automation Studio 5000 Logix Designer, RSLogix 5000, Logix Controllers≤ Studio 5000 Logix Designer: Versions 21 and laterenisa_euvdEU
- n/a Rockwell Automation Studio 5000 Logix Designer, RSLogix 5000, Logix Controllers≤ DriveLogix 5560, 5730, 1794-L34enisa_euvdEU
advisories (1)
Vendor and ecosystem advisories describing this.
- ICSA-21-056-03Rockwell Automation Logix Controllers (Update A)2021-02-25icsa · cisa_csaf_otUS
Successful exploitation of this vulnerability could allow a remote unauthenticated attacker to bypass the verification mechanism and connect with Logix controllers. Additionally, this vulnerability could enable an unauthorized third-party tool to alter the controller 's configuration and/or application code.
also known as (4)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (7)
External citations — patches, advisories, analysis.
- https://nvd.nist.gov/vuln/detail/CVE-2021-22681cnnvd
- https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1130301Patchcnnvd
- https://us-cert.cisa.gov/ics/advisories/icsa-21-056-03cnnvd
- https://www.auscert.org.au/bulletins/ESB-2021.0712cnnvd
- https://us-cert.cisa.gov/ics/advisories/icsa-21-056-03enisa_euvd
- https://us-cert.cisa.gov/ics/advisories/icsa-21-056-03Third Party AdvisoryUS Government Resourcenvd
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22681US Government Resourcenvd
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