CVE-2025-2838 Silicon Labs Gecko OS DNS Response Processing Infinite Loop Denial-of-Service Vulnerability

Medium 6.5 Published 26 Mar 2025 Updated 27 Mar 2025

Network-adjacent attackers can cause a denial-of-service condition in Silicon Labs Gecko OS via an infinite loop in DNS response processing.

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

What is CVE-2025-2838?

CVE-2025-2838 is a medium-severity denial of service vulnerability in Silicon Labs Gecko OS, published on 26 Mar 2025. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Silicon Labs Gecko OS DNS Response Processing Infinite Loop Denial-of-Service Vulnerability. This vulnerability allows network-adjacent attackers to create a denial-of-service condition on affected installations of Silicon Labs Gecko OS. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the processing of DNS responses. The issue results from a logic error that can lead to an infinite loop. An attacker can leverage this vulnerability to create a denial-of-service condition on the system. Was ZDI-CAN-23392.

Weakness: CWE-835

Which versions are affected by CVE-2025-2838?

It affects 1 product.

Products include Silabs Gecko Os.

How do I fix CVE-2025-2838?

No fix has been published for CVE-2025-2838 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-2025-2838 being exploited?

There is no known exploitation of CVE-2025-2838 in the wild and no public exploit code.

Sources

Also known as GHSA-2h59-fjvh-cg52.