search menu icon-carat-right cmu-wordmark

CERT Coordination Center

mod_ssl contains a format string vulnerability in the ssl_log() function

Vulnerability Note VU#303448

Original Release Date: 2004-07-19 | Last Revised: 2004-07-19


There is a format string vulnerability in the ssl_log() function of the mod_ssl module that could allow an attacker to potentially execute arbitrary code.


mod_ssl is an Apache module that provides Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocol support. There is a format string vulnerability in way the ssl_log() function of the mod_ssl module handles hostnames. By supplying a specially crafted hostname value in an HTTPS request, a remote, unauthenticated attacker could trigger this vulnerability. Please note, the hostname provided would have to exist in the zone.


A remote, unauthenticated attacker could potentially execute arbitrary code on an affected system.



Upgrade to version 2.8.19-1.3.31. Alternatively, apply the appropriate patch or upgrade as specified by your vendor.

Vendor Information

Affected   Unknown   Unaffected


Updated:  July 19, 2004



Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.


The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

CVSS Metrics

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A



This vulnerability was reported by Secunia.

This document was written by Damon Morda.

Other Information

CVE IDs: None
Severity Metric: 6.04
Date Public: 2004-07-16
Date First Published: 2004-07-19
Date Last Updated: 2004-07-19 16:57 UTC
Document Revision: 6

Sponsored by the Department of Homeland Security Office of Cybersecurity and Communications.