CVE-2021-22766 Denial of service in PowerLogic EGX100 (Versions 3.0.0 and newer) and PowerLogic EGX300 (All Versions)

High 7.5 Published 11 Jun 2021 Updated 29 May 2026

A specially crafted HTTP packet can cause a denial of service in Schneider Electric PowerLogic EGX100 and EGX300 energy gateways.

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-2021-22766?

CVE-2021-22766 is a high-severity denial of service vulnerability in PowerLogic EGX100 (Versions 3.0.0 and newer) and PowerLogic EGX300 (All Versions), published on 11 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A CWE-20: Improper Input Validation vulnerability exists in PowerLogic EGX100 (Versions 3.0.0 and newer) and PowerLogic EGX300 (All Versions) that could cause denial of service via a specially crafted HTTP packet

Weakness: CWE-20

Which versions are affected by CVE-2021-22766?

It affects 2 products.

Products include Schneider-Electric Powerlogic Egx100 Firmware, Schneider-Electric Powerlogic Egx300 Firmware.

How do I fix CVE-2021-22766?

No fix has been published for CVE-2021-22766 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-2021-22766 being exploited?

There is no known exploitation of CVE-2021-22766 in the wild and no public exploit code.

Sources

Also known as GHSA-473q-p3cq-866g.