Information Disclosure in CompactLogix Controller Diagnostics Web Server Leading to DoS
CVE-2026-9307 is a sensitive information disclosure issue affecting CompactLogix controllers. The controller's embedded web server exposes CIP Connection IDs on its diagnostics webpage, and those values are accessible to any unauthenticated user with network access to the device. Because CIP Connection IDs are operationally sensitive, an attacker can use the disclosed identifiers to construct malicious packets targeting active communications, which can then be used to disrupt controller operation and trigger a denial-of-service condition.
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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.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
3 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.