CVE-2026-9637 CompactLogix® 5380 / ControlLogix® 5580 - Multiple Vulnerabilities
Attackers can cause a major nonrecoverable fault in Rockwell Logix controllers by sending malformed CIP messages, requiring a power cycle to recover.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-9637?
CVE-2026-9637 is a high-severity denial of service vulnerability in Rockwell Automation CompactLogix® 5380 / ControlLogix® 5580, published on 1 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A denial-of-service security issue exists in the affected Logix platforms listed in the table above. The security issue stems from improper validation of input length during CIP message processing. This can result in a major nonrecoverable fault (MNRF), requiring a power cycle to recover
Weakness: CWE-119
Which versions are affected by CVE-2026-9637?
How do I fix CVE-2026-9637?
No fix has been published for CVE-2026-9637 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-9637 being exploited?
There is no known exploitation of CVE-2026-9637 in the wild and no public exploit code.
Sources
Also known as GHSA-q93h-wjgg-gqf8.