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CVE-2021-22681· NVD / CVE Program· CNA icscert

Rockwell Automation Studio 5000 Logix Designer Versions 21 and later, and RSLogix 5000 Versions 16 through 20 use a key to verify Logix cont

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.

CriticalCVSS 9.8 · v3.1KEVWeaponized No fix recorded
Published
Mar 3, 2021
Updated
Jun 16, 2026
EPSS
63.6% · 99th percentile
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Report tools

JSON

Action score

88

Now

Patch today or shut off access.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
30 / 30 · Listed
EPSS
19 / 30 · 63.6%

CISA SSVC decision

Exploitation
active
Automatable
yes
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Mar 5, 2026. That signals real attacks, not theory.

Remediation deadline for government agencies: Mar 26, 2026.

Affected systems

VendorProduct
rockwellautomationfactorytalk services platform
rockwellautomationrslogix 5000
rockwellautomationstudio 5000 logix designer
rockwellautomationcompact guardlogix 5370
rockwellautomationcompact guardlogix 5380
rockwellautomationcompactlogix 1768
rockwellautomationcompactlogix 1769
rockwellautomationcompactlogix 5370
rockwellautomationcompactlogix 5380
rockwellautomationcompactlogix 5480
rockwellautomationcontrollogix 5550
rockwellautomationcontrollogix 5560

and 8 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • rockwellautomation factorytalk services platform2.10 and later
  • rockwellautomation rslogix 500016 and later · up to 20 inclusive
  • rockwellautomation studio 5000 logix designer21.0 and later

Versions reported by the vendor

Affected version ranges reported by the assigning authority (icscert). Independent of NVD's CPE analysis and usually ahead of it.

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

    • 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 5800affected

Same product

rockwellautomation: all records

Other highest-scoring records for the same primary product.

  • CVE-2020-14516In Rockwell Automation FactoryTalk Services Platform Versions 6.10.00 and 6.11.00, there is an issue with the implementation of the SHA-256
    41Plan
  • CVE-2020-6967In Rockwell Automation all versions of FactoryTalk Diagnostics software, a subsystem of the FactoryTalk Services Platform, FactoryTalk Diagn
    41Plan
  • CVE-2024-21917Rockwell Automation FactoryTalk® Service Platform Service Token Vulnerability
    36Monitor
  • CVE-2021-32960Rockwell Automation FactoryTalk Services Platform Protection Mechanism Failure
    36Monitor
  • CVE-2024-21915Rockwell Automation FactoryTalk® Service Platform Elevated Privileges Vulnerability Through Web Service Functionality
    35Monitor
  • CVE-2020-12033In Rockwell Automation FactoryTalk Services Platform, all versions, the redundancy host service (RdcyHost.exe) does not validate supplied id
    35Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:02026-07-31

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. CISA KEV+1827 d
  3. First PoC+1975 d
  4. TodaySep 29, 2026+2036 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-522 · Insufficiently Protected Credentials

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records