CVE-2018-7809 Auth bypass in Embedded Web Servers in all Modicon M340, Premium, Quantum PLCs and BMXNOR0200

Critical 9.8 Published 30 Nov 2018 Updated 5 Aug 2024

Unauthenticated remote attackers can delete passwords on Schneider Electric PLC web servers, leading to unauthorized access and privilege escalation.

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-2018-7809?

CVE-2018-7809 is a critical authentication bypass vulnerability in Schneider Electric SE Embedded Web Servers in all Modicon M340, Premium, Quantum PLCs and BMXNOR0200, published on 30 Nov 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An Unverified Password Change vulnerability exists in the embedded web servers in all Modicon M340, Premium, Quantum PLCs and BMXNOR0200 which could allow an unauthenticated remote user to access the password delete function of the web server.

Weakness: CWE-640

Which versions are affected by CVE-2018-7809?

It affects 4 products.

Products include Schneider-Electric Modicom Bmxnor0200h Firmware, Schneider-Electric Modicom M340 Firmware, Schneider-Electric Modicom Premium Firmware, Schneider-Electric Modicom Quantum Firmware.

How do I fix CVE-2018-7809?

No fix has been published for CVE-2018-7809 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2018-7809 being exploited?

There is no known exploitation of CVE-2018-7809 in the wild and no public exploit code.

Sources

Also known as GHSA-r8f4-qrcc-h436.