Critical DoS Vulnerability in Rockwell Compact GuardLogix 5370 Exposes Manufacturing Operations
Executive Summary
In October 2025, Rockwell Automation disclosed a critical remotely exploitable vulnerability (CVE-2025-9124) affecting Compact GuardLogix 5370 industrial controllers, stemming from an uncaught exception flaw. Attackers could trigger a denial-of-service by sending crafted CIP unconnected explicit messages, resulting in a major, non-recoverable device fault. The vulnerability, reported by Rockwell itself, exposes impacted controllers to significant operational disruptions, particularly concerning for organizations within critical manufacturing sectors worldwide. Immediate device upgrades and network segmentation were recommended to mitigate risk.
This vulnerability highlights persistent gaps in OT security as attackers increase their focus on industrial control systems. The incident underscores the urgency surrounding real-time vulnerability management and emphasizes the rising threat surface presented by remotely accessible critical infrastructure.
Why This Matters Now
Industrial control systems remain an attractive target for threat actors, and remotely exploitable vulnerabilities such as this can disrupt critical operations and supply chains. With ongoing digital transformation and increased connectivity, prompt patching and network isolation are essential to prevent potentially severe denial-of-service or sabotage scenarios in core manufacturing environments.
Attack Path Analysis
The attacker remotely exploited an unhandled exception vulnerability in Rockwell Compact GuardLogix 5370 PLC by sending crafted CIP messages, leading to device compromise without authentication. No privilege escalation was needed as the vulnerability could be triggered without additional rights. Once initial access was gained, the attacker might attempt lateral movement to other ICS devices within the same network. The attacker could establish command and control by issuing further malicious commands or payloads. Data exfiltration is not a primary goal here, as the attack is aimed at disruption, but an attacker could attempt to exfiltrate configuration or process data if possible. Ultimately, the attacker induces a denial-of-service condition, causing operational disruption to critical manufacturing processes.
Kill Chain Progression
Initial Compromise
Description
The attacker exploited a remotely accessible vulnerability (uncaught exception in CIP message handling) to trigger a fault on the target PLC without requiring credentials.
Related CVEs
CVE-2025-9124
CVSS 7.5An uncaught exception vulnerability in Rockwell Automation's Compact GuardLogix 5370 controllers allows remote attackers to cause a major non-recoverable fault, leading to a denial-of-service condition.
Affected Products:
Rockwell Automation Compact GuardLogix 5370 – 30.012 and prior
Exploit Status:
no public exploitCVE-2020-6998
CVSS 5.8Improper input validation in Rockwell Automation's CompactLogix 5370 and ControlLogix 5570 controllers allows remote attackers to cause infinite wait times, resulting in denial-of-service conditions.
Affected Products:
Rockwell Automation CompactLogix 5370 – All versions
Rockwell Automation Compact GuardLogix 5370 – All versions
Rockwell Automation ControlLogix 5570 – All versions
Rockwell Automation ControlLogix 5570 redundancy – All versions
Rockwell Automation GuardLogix 5570 – All versions
Exploit Status:
no public exploitCVE-2022-3157
CVSS 8.6A vulnerability in Rockwell Automation controllers allows malformed CIP requests to cause a major non-recoverable fault, leading to a denial-of-service condition.
Affected Products:
Rockwell Automation CompactLogix 5370 – 20.011 and later
Rockwell Automation Compact GuardLogix 5370 – 28.011 and later
Rockwell Automation ControlLogix 5570 – 20.011 and later
Rockwell Automation ControlLogix 5570 redundancy – 20.054 and later
Rockwell Automation GuardLogix 5570 – 20.011 and later
Exploit Status:
no public exploit
MITRE ATT&CK® Techniques
Endpoint Denial of Service
Denial of Service
Exploitation for Denial
Network Denial of Service
Exploitation for Client Execution
Remote Services
Exploitation of Remote Services
Potential Compliance Exposure
Mapping incident impact across multiple compliance frameworks.
NIS2 Directive – Supply Chain Security and System Resilience
Control ID: Article 21(2)(d)
CISA Zero Trust Maturity Model 2.0 – Network and Asset Segmentation
Control ID: Resilience: Asset Segmentation and Isolation
PCI DSS 4.0 – Network Segmentation Controls
Control ID: Requirement 1.4.1
NYDFS 23 NYCRR 500 – Cybersecurity Policy & Access Privileges
Control ID: Section 500.03 & 500.07
DORA (Digital Operational Resilience Act) – ICT Risk Management for Operational Continuity
Control ID: Article 8(1)(c)
Sector Implications
Industry-specific impact of the vulnerabilities, including operational, regulatory, and cloud security risks.
Industrial Automation
Critical Manufacturing systems using Rockwell Automation Compact GuardLogix 5370 controllers face denial-of-service vulnerabilities requiring immediate firmware upgrades and network segmentation.
Automotive
Manufacturing operations relying on GuardLogix safety controllers vulnerable to crafted CIP messages causing major non-recoverable faults, disrupting production lines and safety systems.
Oil/Energy/Solar/Greentech
Energy infrastructure using affected Rockwell controllers exposed to remote exploitation causing system denial-of-service, requiring upgraded firmware and enhanced network isolation protocols.
Utilities
Critical utility operations dependent on GuardLogix control systems face high-severity CVSS 8.7 vulnerabilities enabling remote attackers to cause operational disruptions through crafted messages.
Sources
- Rockwell Automation Compact GuardLogix 5370https://www.cisa.gov/news-events/ics-advisories/icsa-25-294-02Verified
- SD1755 | Security Advisory | Rockwell Automationhttps://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1755.htmlVerified
- PN1554 | Security Advisory | Rockwell Automationhttps://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.PN1554.htmlVerified
- PN1613 | Security Advisory | Rockwell Automationhttps://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.PN1613.htmlVerified
Frequently Asked Questions
Cloud Native Security Fabric Mitigations and ControlsCNSF
Implementing CNSF-aligned controls such as Zero Trust Segmentation, east-west traffic security, and cloud-native inline enforcement would restrict untrusted communications, detect anomalous activity, and limit the blast radius from a successful exploit of the PLC vulnerability. Denial-of-service and lateral movement attempts could be prevented or rapidly detected, reducing operational impact.
Control: Zero Trust Segmentation
Mitigation: Unauthorized communication to the PLC is blocked at the network fabric.
Control: Multicloud Visibility & Control
Mitigation: Attempts to access or enumerate further resources are detected and logged.
Control: East-West Traffic Security
Mitigation: Lateral movement within network segments is blocked or tightly controlled.
Control: Threat Detection & Anomaly Response
Mitigation: Unusual command patterns or ongoing malicious activity generate alerts for security teams.
Control: Egress Security & Policy Enforcement
Mitigation: Unauthorized outbound data transfers are blocked or flagged.
Device faults and outages are rapidly detected, supporting timely containment.
Impact at a Glance
Affected Business Functions
- Manufacturing Operations
- Process Control
Estimated downtime: 2 days
Estimated loss: $50,000
No data exposure reported; vulnerabilities primarily lead to denial-of-service conditions affecting operational continuity.
Recommended Actions
Key Takeaways & Next Steps
- • Enforce Zero Trust Segmentation and strict access controls to isolate PLCs and OT assets from untrusted networks.
- • Implement east-west traffic security and microsegmentation to block unauthorized lateral movement across cloud and data center environments.
- • Deploy continuous anomaly detection for real-time identification of suspicious activity, including unexpected command or message patterns to industrial devices.
- • Apply robust egress security policies to monitor and prevent unauthorized data exfiltration or external command activity from sensitive segments.
- • Centralize visibility and incident response workflows to rapidly detect, contain, and recover from denial-of-service or disruption events impacting critical infrastructure.
