CVE-2018-14821 Denial of service in RSLinx Classic

High 7.5 Published 20 Sep 2018 Updated 17 Sep 2024

Remote unauthenticated attackers can crash RSLinx Classic by sending malformed CIP packets, requiring manual restart to restore 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-2018-14821?

CVE-2018-14821 is a high-severity denial of service vulnerability in Rockwell Automation RSLinx Classic, published on 20 Sep 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Rockwell Automation RSLinx Classic Versions 4.00.01 and prior. This vulnerability may allow a remote, unauthenticated threat actor to intentionally send a malformed CIP packet to Port 44818, causing the RSLinx Classic application to terminate. The user will need to manually restart the software to regain functionality.

Weakness: CWE-119, CWE-122

Which versions are affected by CVE-2018-14821?

It affects 1 product.

Products include Rockwellautomation Rslinx.

How do I fix CVE-2018-14821?

No fix has been published for CVE-2018-14821 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-2018-14821 being exploited?

There is no known exploitation of CVE-2018-14821 in the wild and no public exploit code.

Sources

Also known as GHSA-g2xj-449r-g2rx.