CVE-2023-27855 Rockwell Automation ThinManager ThinServer Path Traversal Upload

Critical 9.8 Published 21 Mar 2023 Updated 25 Feb 2025

Unauthenticated attackers can upload arbitrary files via path traversal to overwrite executables, potentially achieving remote code execution on ThinServer.

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-2023-27855?

CVE-2023-27855 is a critical path traversal vulnerability in Rockwell Automation ThinManager ThinServer, published on 21 Mar 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In affected versions, a path traversal exists when processing a message in Rockwell Automation's ThinManager ThinServer. An unauthenticated remote attacker could potentially exploit this vulnerability to upload arbitrary files to any directory on the disk drive where ThinServer.exe is installed. The attacker could overwrite existing executable files with attacker-controlled, malicious contents, potentially causing remote code execution.

Weakness: CWE-22

Which versions are affected by CVE-2023-27855?

It affects 1 product.

Products include Rockwellautomation Thinmanager.

How do I fix CVE-2023-27855?

No fix has been published for CVE-2023-27855 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-2023-27855 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-27855 exists.

Public exploit code: 1 Metasploit module.

Sources

Also known as GHSA-pp6m-q8hc-23jj.