CVE-2026-35225 Improper timeout handling in CODESYS EtherNetIP
An unauthenticated remote attacker can exhaust TCP connections in CODESYS EtherNet/IP, causing denial of service for legitimate clients.
- 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-2026-35225?
CVE-2026-35225 is a high-severity denial of service vulnerability in CODESYS EtherNetIP, published on 23 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An unauthenticated remote attacker is able to exhaust all available TCP connections in the CODESYS EtherNet/IP adapter stack, preventing legitimate clients from establishing new connections.
Weakness: CWE-754
Which versions are affected by CVE-2026-35225?
How do I fix CVE-2026-35225?
No fix has been published for CVE-2026-35225 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-2026-35225 being exploited?
There is no known exploitation of CVE-2026-35225 in the wild and no public exploit code.
Sources
Also known as GHSA-c7pv-j8xr-mmhj.