Apache HTTP Server up to 2.0.53 mod_setenvif apr_pcalloc input validation

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.

A vulnerability was found in Apache HTTP Server up to 2.0.53 (Web Server). It has been rated as problematic. Affected by this issue is the function apr_pcalloc of the component mod_setenvif. The manipulation with an unknown input leads to a privilege escalation vulnerability. Using CWE to declare the problem leads to CWE-20. Impacted is availability.

The weakness was published 11/08/2011 by halfdog (Website). The advisory is available at halfdog.net. This vulnerability is handled as CVE-2011-4415 since 11/08/2011. The exploitation is known to be difficult. Local access is required to approach this attack. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 11/26/2021).

The vulnerability scanner Nessus provides a plugin with the ID 59851 (HP System Management Homepage < 7.1.1 Multiple Vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Web Servers. The commercial vulnerability scanner Qualys is able to test this issue with plugin 87122 (HP System Management Homepage Multiple Vulnerabilities (HPSBMU02786)).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at X-Force (71181), Vulnerability Center (SBV-40304) and Tenable (59851). Similar entries are available at 4577, 61162, 61161 and 61160.





CPE 2.3infoedit

CPE 2.2infoedit


VulDB Meta Base Score: 2.9
VulDB Meta Temp Score: 2.9

VulDB Base Score: 2.9
VulDB Temp Score: 2.9
VulDB Vector: 🔍
VulDB Reliability: 🔍



VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍


Class: Privilege escalation
ATT&CK: Unknown

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔍


Nessus ID: 59851
Nessus Name: HP System Management Homepage < 7.1.1 Multiple Vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 103333
OpenVAS Name: Apache HTTP Server ap_pregsub() Function Local Denial of Service Vulnerability
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfoedit

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍


Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍


11/02/2011 🔍
11/08/2011 +6 days 🔍
11/08/2011 +0 days 🔍
11/08/2011 +0 days 🔍
11/10/2011 +2 days 🔍
07/03/2013 +601 days 🔍
03/23/2015 +628 days 🔍
11/26/2021 +2440 days 🔍


Vendor: https://www.apache.org/

Advisory: halfdog.net
Researcher: halfdog
Status: Not defined
Confirmation: 🔍

CVE: CVE-2011-4415 (🔍)
X-Force: 71181
Vulnerability Center: 40304 - Apache Software Foundation Apache Server and HP System Management Homepage Local Denial of Service With Non Default Settings, Low
SecurityFocus: 50639 - Apache HTTP Server 'ap_pregsub()' Function Local Denial of Service Vulnerability

See also: 🔍


Created: 03/23/2015 04:50 PM
Updated: 11/26/2021 07:47 AM
Changes: (3) vulnerability_cvss2_nvd_basescore exploit_price_0day source_nessus_risk
Complete: 🔍


No comments yet. Languages: en.

Please log in to comment.

Interested in the pricing of exploits?

See the underground prices here!