CVE-2021-22736 Path traversal in homeLYnk (Wiser For KNX) and spaceLYnk V2.60 and prior

High 7.5 Published 26 May 2021 Updated 3 Aug 2024

An attacker can cause a denial of service by uploading unauthorized files due to a path traversal vulnerability in Schneider Electric homeLYnk and spaceLYnk devices.

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-2021-22736?

CVE-2021-22736 is a high-severity path traversal vulnerability in homeLYnk (Wiser For KNX) and spaceLYnk V2.60 and prior, published on 26 May 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability exists in homeLYnk (Wiser For KNX) and spaceLYnk V2.60 and prior which could cause a denial of service when an unauthorized file is uploaded.

Weakness: CWE-22

Which versions are affected by CVE-2021-22736?

It affects 2 products.

Products include Schneider-Electric Homelynk Firmware, Schneider-Electric Spacelynk Firmware.

How do I fix CVE-2021-22736?

No fix has been published for CVE-2021-22736 yet. Limit exposure of the affected software until one is available.

Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.

Is CVE-2021-22736 being exploited?

There is no known exploitation of CVE-2021-22736 in the wild and no public exploit code.

Sources

Also known as GHSA-xf6c-g664-4qp4.