CVE-2026-84235 Rockwell Automation 1756-ENBT Denial of Service Vulnerability
A crafted CIP packet can crash the Rockwell Automation 1756-ENBT module, requiring a restart to recover service.
- 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-2026-84235?
CVE-2026-84235 is a high-severity denial of service vulnerability in Rockwell Automation 1756-ENBT Module, 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 product. The security issue stems from a crafted CIP packet being sent crashing the module. The device requires a restart to recover.
Weakness: CWE-400
Which versions are affected by CVE-2026-84235?
How do I fix CVE-2026-84235?
No fix has been published for CVE-2026-84235 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-2026-84235 being exploited?
There is no known exploitation of CVE-2026-84235 in the wild and no public exploit code.
Sources
Also known as GHSA-vgg9-hj2v-mg26.