CVE-2021-34586 CODESYS V2 web server: crafted requests could trigger a null pointer dereference (DoS)

High 7.5 Published 26 Oct 2021 Updated 17 Sep 2024

Crafted requests to the CODESYS V2 web server can trigger a null pointer dereference, causing a denial-of-service condition.

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-2021-34586?

CVE-2021-34586 is a high-severity vulnerability in CODESYS V2, published on 26 Oct 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In the CODESYS V2 web server prior to V1.1.9.22 crafted web server requests may cause a Null pointer dereference in the CODESYS web server and may result in a denial-of-service condition.

Weakness: CWE-476

Which versions are affected by CVE-2021-34586?

It affects 28 products.

Products include Codesys Codesys, Wago 750-8202 Firmware, Wago 750-8203 Firmware, Wago 750-8204 Firmware, Wago 750-8206 Firmware, Wago 750-8207 Firmware and 22 more.

How do I fix CVE-2021-34586?

No fix has been published for CVE-2021-34586 yet. Limit exposure of the affected software until one is available.

Is CVE-2021-34586 being exploited?

There is no known exploitation of CVE-2021-34586 in the wild and no public exploit code.

Sources

Also known as GHSA-hmwx-8xfx-mg6m.