CVE-2023-40216 Denial of service in n/a

Medium 5.5 Published 10 Aug 2023 Updated 9 Oct 2024

A missing bounds check in OpenBSD's console terminal emulation allows attackers to cause a kernel crash via crafted escape sequences.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2023-40216?

CVE-2023-40216 is a medium-severity denial of service vulnerability in Openbsd Openbsd, published on 10 Aug 2023. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

OpenBSD 7.3 before errata 014 is missing an argument-count bounds check in console terminal emulation. This could cause incorrect memory access and a kernel crash after receiving crafted DCS or CSI terminal escape sequences.

Weakness: CWE-862

Which versions are affected by CVE-2023-40216?

It affects 1 product.

Products include Openbsd Openbsd.

How do I fix CVE-2023-40216?

No fix has been published for CVE-2023-40216 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-2023-40216 being exploited?

There is no known exploitation of CVE-2023-40216 in the wild and no public exploit code.

All Openbsd Openbsd vulnerabilities

Sources

Also known as GHSA-9735-hqm8-4h6p.