CVE-2026-12659 Rockwell Automation Flex 5000® Adapter - Denial of Service
Attackers can cause a denial of service in Rockwell FLEX 5000 adapters by sending crafted CIP packets, 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-2026-12659?
CVE-2026-12659 is a high-severity denial of service vulnerability in Rockwell Automation The FLEX 5000® EtherNet/IP Adapter, published on 14 Jul 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 products. The security issue stems from improper handling of exceptional conditions when processing crafted CIP packets sent to the adapter. A power cycle is required to recover the module and associated I/O.
Weakness: CWE-415
Which versions are affected by CVE-2026-12659?
How do I fix CVE-2026-12659?
No fix has been published for CVE-2026-12659 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-2026-12659 being exploited?
There is no known exploitation of CVE-2026-12659 in the wild and no public exploit code.
Sources
Also known as GHSA-vxg7-9hgq-fphj.