cPanel – EasyApache & UPCP Denial of Service (R911-0167)

Type: Denial of Service
Location: Local
Impact: High
Product: cPanel
Vulnerable Version: All versions prior to the fixed builds below.
Fixed Version:,, &
CVE: -
R911: 0167
Date: 2014-07-28
By: RACK911

Product Description:

cPanel is an easy-to-use control panel that gives web hosts and the website owners they serve, the ability to quickly and easily manage their servers and websites. Web Host Manager (WHM) is a part of the cPanel software, often used by resellers and system administrators.

Vulnerability Description:

It is possible for a malicious user to prevent EasyApache & UPCP (cPanel Update) from running, should they execute a carefully crafted process.


We have deemed this vulnerability to be rated as HIGH due to the fact that a user can interfere with updates which could prevent a server from obtaining the necessary security patches.

Vulnerable Version:

This vulnerability was tested against cPanel and is believed to exist in all versions prior to the fixed builds below.

Fixed Version:

This vulnerability was patched in cPanel,, &

Vendor Contact Timeline:

2014-04-09: Vendor contacted via email.
2014-04-14: Vendor confirms vulnerability.
2014-07-21: Vendor issues updates to all builds.
2014-07-28: RACK911 issues security advisory.