Answer in brief
CVE-2021-22681 records a High severity vulnerability in CVE Program Container. The current sources mark it as known exploited. The current feed maps n/a/Rockwell Automation Studio 5000 Logix Designer, RSLogix 5000, Logix Controllers (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. Known-exploitation status makes exposure review time-sensitive. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps n/a/Rockwell Automation Studio 5000 Logix Designer, RSLogix 5000, Logix Controllers (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| n/a/Rockwell Automation Studio 5000 Logix Designer, RSLogix 5000, Logix Controllersgeneric | RSLogix 5000 Versions 16 through 20 || Studio 5000 Logix Designer: Versions 21 and later || 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 | Not reported |
Published upstream
Mar 3, 2021
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Mar 26, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
May 24, 2026
Added to CISA KEV
Mar 5, 2026
Evidence: source:kev:kev:kev:recordRockwell 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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2021-22681 records a High severity vulnerability in CVE Program Container. The current sources mark it as known exploited. The current feed maps n/a/Rockwell Automation Studio 5000 Logix Designer, RSLogix 5000, Logix Controllers (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. Known-exploitation status makes exposure review time-sensitive. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps n/a/Rockwell Automation Studio 5000 Logix Designer, RSLogix 5000, Logix Controllers (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| n/a/Rockwell Automation Studio 5000 Logix Designer, RSLogix 5000, Logix Controllersgeneric | RSLogix 5000 Versions 16 through 20 || Studio 5000 Logix Designer: Versions 21 and later || 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 | Not reported |
Published upstream
Mar 3, 2021
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Mar 26, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
May 24, 2026
Added to CISA KEV
Mar 5, 2026
Evidence: source:kev:kev:kev:recordRockwell 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.
Quoted source text, attributed separately from HOL analysis.