CVE-2021-27478 EIPStackGroup OpENer Ethernet/IP Incorrect Conversion between Numeric Types

High 8.2 Published 12 May 2022 Updated 16 Apr 2025

A crafted packet can cause a denial-of-service condition in EIPStackGroup OpENer EtherNet/IP due to incorrect numeric type conversion.

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-2021-27478?

CVE-2021-27478 is a high-severity vulnerability in EIPStackGroup OpENer EtherNet/IP, published on 12 May 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A specifically crafted packet sent by an attacker to EIPStackGroup OpENer EtherNet/IP commits and versions prior to Feb 10, 2021 may cause a denial-of-service condition.

Weakness: CWE-681

Which versions are affected by CVE-2021-27478?

It affects 1 product.

Products include Opener Project Opener.

How do I fix CVE-2021-27478?

No fix has been published for CVE-2021-27478 yet. Limit exposure of the affected software until one is available.

Is CVE-2021-27478 being exploited?

There is no known exploitation of CVE-2021-27478 in the wild and no public exploit code.

Sources

Also known as GHSA-3c24-g4gm-98v9.