CVE-2020-6998: Rockwell Automation CompactLogix 5370 and ControlLogix 5570 Controllers Improper Input Validation
Noroxi assessment
Priority: Monitor (action score 35/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 3.1% (FIRST EPSS); higher than 88.1% of all records.
- 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.
- According to CISA the attack is automatable: targets can be found by mass scanning.
- According to the record, no fixed version is available yet.
- Severity is disputed: the assigning authority (CNA) scores it 5.8, NVD 8.6.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Update when a fix is released; follow the vendor's advisory.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
The connection establishment algorithm found in Rockwell Automation CompactLogix 5370 and ControlLogix 5570 versions 33 and prior does not sufficiently manage its control flow during execution, creating an infinite loop. This may allow an attacker to send specially crafted CIP packet requests to a controller, which may cause denial-of-service conditions in communications with other products.
- Published
- Jul 27, 2022
- Updated
- Jun 16, 2026
- EPSS
- 3.1% · 88th percentile
- CWE
- CWE-20
Report tools
Action score
35
Low priority for now.
- CVSS
- 34 / 40 · 8.6 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 3.1%
CISA SSVC decision
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 8.6
- CNA · icscert
- 5.8
- 2.8 point gap
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- No fixed version yet
If any of these changes, we'll tell you in the daily email digest.
Is your version affected? Check itNoroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| rockwellautomation | armor compact guardlogix 5370 firmware | cpe:2.3:o:rockwellautomation:armor_compact_guardlogix_5370_firmware |
| rockwellautomation | armor compact guardlogix 5370 | cpe:2.3:h:rockwellautomation:armor_compact_guardlogix_5370 |
| rockwellautomation | compact guardlogix 5370 firmware | cpe:2.3:o:rockwellautomation:compact_guardlogix_5370_firmware |
| rockwellautomation | compact guardlogix 5370 | cpe:2.3:h:rockwellautomation:compact_guardlogix_5370 |
| rockwellautomation | compactlogix 5370 l1 firmware | cpe:2.3:o:rockwellautomation:compactlogix_5370_l1_firmware |
| rockwellautomation | compactlogix 5370 l1 | cpe:2.3:h:rockwellautomation:compactlogix_5370_l1 |
| rockwellautomation | compactlogix 5370 l2 firmware | cpe:2.3:o:rockwellautomation:compactlogix_5370_l2_firmware |
| rockwellautomation | compactlogix 5370 l2 | cpe:2.3:h:rockwellautomation:compactlogix_5370_l2 |
| rockwellautomation | compactlogix 5370 l3 firmware | cpe:2.3:o:rockwellautomation:compactlogix_5370_l3_firmware |
| rockwellautomation | compactlogix 5370 l3 | cpe:2.3:h:rockwellautomation:compactlogix_5370_l3 |
| rockwellautomation | controllogix 5570 firmware | cpe:2.3:o:rockwellautomation:controllogix_5570_firmware |
| rockwellautomation | controllogix 5570 | cpe:2.3:h:rockwellautomation:controllogix_5570 |
and 6 more
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.
Rockwell Automation Armor Compact GuardLogix 5370 controllers
- unspecified and later · up to and including versions 33 and prioraffected
Rockwell Automation Armor GuardLogix Safety Controllers
- unspecified and later · up to and including versions 33 and prioraffected
Rockwell Automation Compact GuardLogix 5370 controllers
- unspecified and later · up to and including versions 33 and prioraffected
Rockwell Automation CompactLogix 5370 L1 controllers
- unspecified and later · up to and including versions 33 and prioraffected
Rockwell Automation CompactLogix 5370 L2 controllers
- unspecified and later · up to and including versions 33 and prioraffected
Rockwell Automation CompactLogix 5370 L3 controllers
- unspecified and later · up to and including versions 33 and prioraffected
Rockwell Automation ControlLogix 5570 controllers
- unspecified and later · up to and including versions 33 and prioraffected
Affected versions · NVD (9)
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- rockwellautomation armor compact guardlogix 5370 firmwareup to 33 inclusive
- rockwellautomation compact guardlogix 5370 firmwareup to 33 inclusive
- rockwellautomation compactlogix 5370 l1 firmwareup to 33 inclusive
- rockwellautomation compactlogix 5370 l2 firmwareup to 33 inclusive
- rockwellautomation compactlogix 5370 l3 firmwareup to 33 inclusive
- rockwellautomation controllogix 5570 firmwareup to 33 inclusive
- rockwellautomation guardlogix 5560 firmwareup to 33 inclusive
- rockwellautomation guardlogix 5570 firmwareup to 33 inclusive
- rockwellautomation guardlogix 5580 firmwareup to 33 inclusive
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
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
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.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-21-0189 · Mar 3, 2021(Rockwell Automation Güvenlik Bildirimi)
Not on record for this CVE: patch commit or PR link · variant or chain candidate · public bounty program.
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
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
Impact can extend beyond the vulnerable component (scope changes).
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-20 · Improper Input ValidationCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/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.
Attack patterns (CAPEC)
- Buffer Overflow via Environment VariablesCAPEC-10likelihood: High · High
- Server Side Include (SSI) InjectionCAPEC-101likelihood: High · High
- Cross Zone ScriptingCAPEC-104likelihood: Medium · High
- Command Line Execution through SQL InjectionCAPEC-108likelihood: Low · Very High
- Object Relational Mapping InjectionCAPEC-109likelihood: Low · High
- SQL Injection through SOAP Parameter TamperingCAPEC-110likelihood: High · Very High
- Double EncodingCAPEC-120likelihood: Low · Medium
- Subverting Environment Variable ValuesCAPEC-13likelihood: High · Very High
ATT&CK techniques
- Obfuscated Files or InformationT1027
- Masquerading: Invalid Code SignatureT1036.001
- Steal Web Session CookieT1539
- Subvert Trust Controls: Code SigningT1553.002
- Impair Defenses:Impair Command History LoggingT1562.003
- Hijack Execution Flow:Dynamic Linker HijackingT1574.006
- Hijack Execution Flow:Path Interception by PATH Environment VariableT1574.007
Change log (0)
No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.
References
Show all references (1 more)Show less
Vendor advisories and official records. Exploit/PoC links are deliberately left out.