CVE-2021-27565 Denial of service in n/a

High 7.5 Published 19 Aug 2021 Updated 3 Aug 2024

Remote attackers can cause a denial of service in the NicheStack web server by sending specific HTTP requests that trigger an infinite loop.

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-2021-27565?

CVE-2021-27565 is a high-severity denial of service vulnerability in n/a, published on 19 Aug 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

The web server in InterNiche NicheStack through 4.0.1 allows remote attackers to cause a denial of service (infinite loop and networking outage) via an unexpected valid HTTP request such as OPTIONS. This occurs because the HTTP request handler enters a miscoded wbs_loop() debugger hook.

Weakness: CWE-835

Which versions are affected by CVE-2021-27565?

It affects 1 product.

Products include Hcc-Embedded Nichestack.

How do I fix CVE-2021-27565?

No fix has been published for CVE-2021-27565 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-2021-27565 being exploited?

There is no known exploitation of CVE-2021-27565 in the wild and no public exploit code.

Sources

Also known as GHSA-r4v2-qg7m-3xrh.