CVE-2021-26264 Emerson DeltaV Missing Authentication for Critical Function

Medium 6.1 Published 28 Jan 2022 Updated 17 Apr 2025

Attackers can send crafted scripts to restart DeltaV DCS controllers, causing denial of service due to missing authentication.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-26264?

CVE-2021-26264 is a medium-severity missing authorization vulnerability in n/a, published on 28 Jan 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A specially crafted script could cause the DeltaV Distributed Control System Controllers (All Versions) to restart and cause a denial-of-service condition.

Weakness: CWE-306

Which versions are affected by CVE-2021-26264?

It affects 2 products.

Products include Emerson Deltav Distributed Control System, Emerson Deltav Workstation.

How do I fix CVE-2021-26264?

No fix has been published for CVE-2021-26264 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2021-26264 being exploited?

There is no known exploitation of CVE-2021-26264 in the wild and no public exploit code.

Sources

Also known as GHSA-x46h-6fmr-m5fr.