Published: 12/04/2017 Updated: 20/04/2017
CVSS v2 Base Score: 7.5 | Impact Score: 6.4 | Exploitability Score: 10
CVSS v3 Base Score: 9.8 | Impact Score: 5.9 | Exploitability Score: 3.9

Vulnerability Summary

Buffer overflow in Apache Tomcat Connectors (mod_jk) before 1.2.42.

A vulnerability in Apache Tomcat JK Connector could allow an unauthenticated, remote attacker to execute arbitrary code or cause a denial of service (DoS) condition.

The vulnerability is due to insufficient bounds checking by the affected software. An attacker could exploit this vulnerability by sending a crafted URI to a targeted virtual host. An exploit could trigger a buffer overflow condition that the attacker could leverage to execute arbitrary code or cause a DoS condition.

Apache has confirmed the vulnerability and released software updates.

Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P
Access Complexity: LOW
Authentication: NONE
Access Vector: NETWORK
Confidentiality Impact: PARTIAL
Integrity Impact: PARTIAL
Availability Impact: PARTIAL

Affected Products

Vendor Product Versions
ApacheTomcat Jk Web Server Connector1.2.41


Administrators are advised to apply the appropriate updates.

Administrators are advised to allow only trusted users to have network access.

Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.

Administrators are advised to monitor affected systems.


To exploit this vulnerability, an attacker may need access to trusted, internal networks in which the targeted system may reside to send a crafted URI to the system. This access requirement may reduce the likelihood of a successful exploit.