CVE-2021-43939 Elcomplus SmartPtt Improper Authorization

High 8.8 Published 28 Apr 2022 Updated 16 Apr 2025

Low-privileged users can access administrative functions by directly calling protected endpoints, leading to privilege escalation in SmartPTT.

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

What is CVE-2021-43939?

CVE-2021-43939 is a high-severity missing authorization vulnerability in Elcomplus SmartPTT, published on 28 Apr 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Elcomplus SmartPTT is vulnerable when a low-authenticated user can access higher level administration authorization by issuing requests directly to the desired endpoints.

Weakness: CWE-285

Which versions are affected by CVE-2021-43939?

It affects 1 product.

Products include Smartptt Smartptt Scada.

How do I fix CVE-2021-43939?

No fix has been published for CVE-2021-43939 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-2021-43939 being exploited?

There is no known exploitation of CVE-2021-43939 in the wild and no public exploit code.

Sources

Also known as GHSA-6vm3-p7q5-88mf.