CVE-2020-7504 Denial of service in Easergy T300 (Firmware version 1.5.2 and older)

Medium 5.3 Published 16 Jun 2020 Updated 4 Aug 2024

An attacker can disable the webserver service on Easergy T300 devices by sending specially crafted network packets, causing a denial of service.

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-2020-7504?

CVE-2020-7504 is a medium-severity denial of service vulnerability in Easergy T300 (Firmware version 1.5.2 and older), published on 16 Jun 2020. 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 Easergy T300 (Firmware version 1.5.2 and older) which could allow an attacker to disable the webserver service on the device when specially crafted network packets are sent.

Weakness: CWE-20

Which versions are affected by CVE-2020-7504?

It affects 1 product.

Products include Schneider-Electric Easergy T300 Firmware.

How do I fix CVE-2020-7504?

No fix has been published for CVE-2020-7504 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-2020-7504 being exploited?

There is no known exploitation of CVE-2020-7504 in the wild and no public exploit code.

Sources

Also known as GHSA-8393-8q55-5f3r.