Apache Tomcat JK ISAPI Connector up to 1.2.41 jk_uri_worker_map.c memory corruption

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 Tomcat JK ISAPI Connector up to 1.2.41 (Application Server Software). It has been declared as very critical. Affected by this vulnerability is an unknown code of the file jk_uri_worker_map.c. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The software performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was shared 10/06/2016 as confirmed advisory (Website). The advisory is shared at tomcat.apache.org. This vulnerability is known as CVE-2016-6808 since 08/12/2016. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/22/2022). The advisory points out:

The IIS/ISAPI specific code implements special handling when a virtual host is present. The virtual host name and the URI are concatenated to create a virtual host mapping rule. The length checks prior to writing to the target buffer for this rule did not take account of the length of the virtual host name, creating the potential for a buffer overflow.
The report does not confirm code execution.

The vulnerability scanner Nessus provides a plugin with the ID 96824 (RHEL 6 : JBoss Core Services (RHSA-2017:0193)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Red Hat Local Security Checks and running in the context local.

Applying the patch Revision 1762057 is able to eliminate this problem. The bugfix is ready for download at svn.apache.org. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at SecurityTracker (ID 1036969) and Tenable (96824). Additional details are provided at svn.apache.org. The entry 36981 is related to this item.





CPE 2.3info

CPE 2.2info


VulDB Meta Base Score: 9.8
VulDB Meta Temp Score: 9.6

VulDB Base Score: 9.8
VulDB Temp Score: 9.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍



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

NVD Base Score: 🔍


Class: Memory corruption
CWE: CWE-119
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍


Nessus ID: 96824
Nessus Name: RHEL 6 : JBoss Core Services (RHSA-2017:0193)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 802665
OpenVAS Name: Apache Tomcat JK Connector Buffer Overflow Vulnerability (Linux)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Threat Intelligenceinfo

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


Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Patch: Revision 1762057


08/12/2016 🔍
10/06/2016 +55 days 🔍
10/06/2016 +0 days 🔍
10/06/2016 +0 days 🔍
10/06/2016 +0 days 🔍
10/08/2016 +2 days 🔍
01/27/2017 +111 days 🔍
04/12/2017 +75 days 🔍
09/22/2022 +1989 days 🔍


Vendor: apache.org

Advisory: RHSA-2017:0193
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-6808 (🔍)
SecurityTracker: 1036969
SecurityFocus: 93429 - Apache Tomcat JK Connector CVE-2016-6808 Remote Buffer Overflow Vulnerability

Misc.: 🔍
See also: 🔍


Created: 10/08/2016 07:09 PM
Updated: 09/22/2022 05:17 PM
Changes: (1) advisory_identifier
Complete: 🔍


No comments yet. Languages: en.

Please log in to comment.

Might our Artificial Intelligence support you?

Check our Alexa App!