Rockwell Automation PLC Flaws Put Industrial Control Systems at Risk in 2025
Executive Summary
In December 2025, Rockwell Automation disclosed multiple vulnerabilities affecting its Micro820, Micro850, and Micro870 programmable logic controllers (PLCs). The most critical issues (CVE-2025-13823, CVE-2025-13824) were found in the IPv6 stack and improper handling of malformed CIP packets, potentially allowing unauthenticated attackers to cause denial-of-service conditions. Successful exploitation could lead to systems becoming unresponsive and requiring physical intervention to restore operation. Affected product versions are widely deployed across critical manufacturing sectors worldwide, increasing the risk of operational disruptions.
This incident highlights the growing exposure of operational technology (OT) devices to network-borne threats and the importance of promptly securing ICS environments. The prevalence of fuzzing-based vulnerability discovery and dependency on third-party components heighten the urgency to apply vendor-recommended mitigations and adopt defense-in-depth strategies.
Why This Matters Now
These vulnerabilities demonstrate the continued risk facing industrial control environments as threat actors and researchers target OT flaws that can cause operational outages. With critical infrastructure increasingly network-connected, promptly addressing such ICS exposures is vital to safeguarding manufacturing and production systems from potential attacks or accidental disruptions.
Attack Path Analysis
An attacker discovers and exploits the unpatched vulnerability in exposed Rockwell Automation controllers using malformed network packets, causing a device fault. With initial access, they may attempt to escalate privileges by seeking weak protocol implementations or default credentials, then pivot laterally by probing other adjacent devices using similar vulnerabilities. Attackers establish command and control via persistent connections or crafted network traffic to maintain foothold. Data exfiltration is less likely but possible through outbound CIP/IP traffic, and finally, the attack results in a denial-of-service impact, disrupting controller operations and critical manufacturing processes.
Kill Chain Progression
Initial Compromise
Description
The attacker sends specifically crafted malformed CIP or IPv6 packets to an internet-exposed or poorly segmented controller, exploiting the CVE to trigger a fault.
Related CVEs
CVE-2025-13823
CVSS 6.5A vulnerability in the IPv6 stack of Rockwell Automation Micro850 and Micro870 controllers allows remote attackers to cause a recoverable fault by sending multiple malformed packets.
Affected Products:
Rockwell Automation Micro850 – <= V12.012
Rockwell Automation Micro870 – <= V12.012
Exploit Status:
no public exploitCVE-2025-13824
CVSS 7.5Improper handling of malformed CIP packets in Rockwell Automation Micro850 and Micro870 controllers can lead to a hard fault, rendering the device unresponsive until a power cycle and fault clearance.
Affected Products:
Rockwell Automation Micro850 – <= V12.012
Rockwell Automation Micro870 – <= V12.012
Exploit Status:
no public exploitCVE-2024-7567
CVSS 5.3A denial-of-service vulnerability in Rockwell Automation Micro850/870 controllers via the CIP/Modbus port can disrupt communication for a short duration.
Affected Products:
Rockwell Automation Micro850 – < V22.011
Rockwell Automation Micro870 – < V22.011
Exploit Status:
no public exploit
MITRE ATT&CK® Techniques
Endpoint Denial of Service
Network Denial of Service
Exploitation for Denial
Device Restart/Shutdown
Exploit Public-Facing Application
Valid Accounts
Modify Controller Tasking
Monitor Process State
Potential Compliance Exposure
Mapping incident impact across multiple compliance frameworks.
NIST SP 800-53 Rev. 5 – Flaw Remediation
Control ID: SI-2
PCI DSS v4.0 – Address Vulnerabilities and Patch Management
Control ID: 6.2.3
NYDFS 23 NYCRR 500 – Cybersecurity Policy
Control ID: 500.03
CISA Zero Trust Maturity Model 2.0 – Comprehensive Asset Management
Control ID: Asset Management
NIS2 Directive – Risk Management Measures and Reporting
Control ID: Art. 21(2) a, c, d
DORA (Digital Operational Resilience Act) – ICT Risk Management Requirements
Control ID: Art. 8
Sector Implications
Industry-specific impact of the vulnerabilities, including operational, regulatory, and cloud security risks.
Industrial Automation
Critical vulnerability in Rockwell Micro820/850/870 controllers enables denial-of-service attacks through malformed IPv6 and CIP packets, disrupting manufacturing operations and requiring immediate patching.
Automotive
Manufacturing systems using affected Rockwell controllers face production line disruptions from network-based DoS attacks, potentially halting vehicle assembly and quality control processes.
Food Production
Processing facilities with vulnerable Rockwell PLCs risk operational shutdowns from remote attacks targeting IPv6 stack, compromising food safety systems and production schedules.
Oil/Energy/Solar/Greentech
Energy infrastructure using Micro820/850/870 controllers vulnerable to network-based attacks causing equipment faults, potentially disrupting power generation and distribution critical infrastructure operations.
Sources
- Rockwell Automation Micro820, Micro850, Micro870https://www.cisa.gov/news-events/ics-advisories/icsa-25-352-07Verified
- Rockwell Automation Security Advisory SD1766https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1766.htmlVerified
- CISA ICS Advisory ICSA-24-226-07https://www.cisa.gov/news-events/ics-advisories/icsa-24-226-07Verified
- NVD Entry for CVE-2025-13823https://nvd.nist.gov/vuln/detail/CVE-2025-13823Verified
Frequently Asked Questions
Cloud Native Security Fabric Mitigations and ControlsCNSF
Zero Trust network segmentation, east-west traffic controls, inline threat prevention, encrypted transport, and real-time anomaly detection would have severely limited the attacker’s ability to access, exploit, and laterally propagate within the OT environment. CNSF-aligned capabilities enforce strict workload isolation and intercept malicious traffic, drastically reducing the exploitability window and business impact.
Control: Zero Trust Segmentation
Mitigation: Blocks network access to controllers from unauthorized or untrusted sources.
Control: Multicloud Visibility & Control
Mitigation: Detects and flags anomalous privilege or configuration changes.
Control: East-West Traffic Security
Mitigation: Prevents unauthorized internal lateral movement between devices.
Control: Inline IPS (Suricata)
Mitigation: Detects and blocks known malicious C2 or exploit signatures.
Control: Egress Security & Policy Enforcement
Mitigation: Stops unauthorized outbound data transfers from critical devices.
Rapidly detects device fault behavior and initiates incident response.
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 cause operational disruptions.
Recommended Actions
Key Takeaways & Next Steps
- • Enforce zero trust segmentation and strict workload isolation for all OT controllers to minimize attack surfaces.
- • Deploy east-west traffic security policies and real-time inline IPS to detect and block protocol-based exploit attempts within the environment.
- • Ensure encrypted traffic flows (e.g., MACsec/IPsec) are mandated for controller communications, preventing external packet interception and manipulation.
- • Apply centralized, multicloud visibility and continuous anomaly detection for rapid detection of unauthorized access, privilege changes, or device outages.
- • Regularly audit controller exposure and egress policies, and restrict outbound communication from OT devices except as strictly required.
