High

Denial of Service in IPv6 Stack of Rockwell Automation Micro850 and Micro870 Controllers

IdentifiersCVE-2025-13823CWE-1395

CVE-2025-13823 is a denial-of-service vulnerability in the IPv6 stack of Rockwell Automation Micro850 and Micro870 controllers. The issue is triggered when the controllers receive multiple malformed IPv6 packets, as identified during fuzzing. Successful triggering causes the controller to enter a recoverable fault state with fault code 0xFE60. The condition affects device availability rather than confidentiality or integrity, and recovery requires clearing the fault on the controller.

For your environment

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation can cause the affected Micro850 or Micro870 controller to enter a recoverable fault state and become unavailable for normal control operations until the fault is cleared. In industrial environments, this can disrupt automation processes and reduce controller availability, creating a denial-of-service condition.

Mitigation

If you can’t patch tonight, do this now.

If IPv6 is not required in the environment, disable IPv6 functionality as a product-specific mitigation for CVE-2025-13823. If immediate upgrading is not possible, reduce exposure by segmenting control networks, limiting controller access from untrusted networks, and applying standard ICS defensive measures such as firewalls and controlled remote access.

Remediation

Patch, then assume compromise.

Apply Rockwell Automation's corrected firmware. The provided advisory indicates upgrading affected Micro850/870 controllers to fixed firmware, specifically L50E/L70E to V23.012 or later, and migrating LC50/LC70 variants to L50E/L70E V23.012. More generally, the supporting content also references Micro850/870 updates to V12.013 or later; operators should follow the vendor's current product-specific upgrade guidance for their exact hardware and firmware branch.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

Rockwell AutomationMicro850hardware

Rockwell AutomationMicro870hardware

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

5 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.

5 SOURCESView more in app

No news coverage yet. Advisories and community discussion only.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity2