CVE-2021-34584 CODESYS V2 web server: crafted requests could trigger a buffer over-read (DoS)

Critical 9.1 Published 26 Oct 2021 Updated 16 Sep 2024

Crafted requests to the CODESYS V2 web server can cause a crash or leak memory, impacting industrial control systems.

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-2021-34584?

CVE-2021-34584 is a critical memory corruption 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

Crafted web server requests can be utilised to read partial stack or heap memory or may trigger a denial-of- service condition due to a crash in the CODESYS V2 web server prior to V1.1.9.22.

Weakness: CWE-126

Which versions are affected by CVE-2021-34584?

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-2021-34584?

No fix has been published for CVE-2021-34584 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2021-34584 being exploited?

There is no known exploitation of CVE-2021-34584 in the wild and no public exploit code.

Sources

Also known as GHSA-j5c2-6xq9-fj5m.