CVE-2023-26597 Controller DOS on sending error response

High 7.5 Published 13 Jul 2023 Updated 5 Mar 2025

A buffer overflow in the Honeywell C300 controller allows attackers to cause a denial of service via specially crafted messages.

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-2023-26597?

CVE-2023-26597 is a high-severity denial of service vulnerability in Honeywell C300, published on 13 Jul 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Controller DoS due to buffer overflow in the handling of a specially crafted message received by the controller. See Honeywell Security Notification for recommendations on upgrading and versioning. See Honeywell Security Notification for recommendations on upgrading and versioning.

Weakness: CWE-787, CWE-400

Which versions are affected by CVE-2023-26597?

It affects 1 product.

Products include Honeywell C300 Firmware.

How do I fix CVE-2023-26597?

No fix has been published for CVE-2023-26597 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-2023-26597 being exploited?

There is no known exploitation of CVE-2023-26597 in the wild and no public exploit code.

Sources

Also known as GHSA-mxwr-w7j9-6428.