search menu icon-carat-right cmu-wordmark

CERT Coordination Center

OpenSSL Server Name extension Denial of Service

Vulnerability Note VU#661475

Original Release Date: 2008-05-30 | Last Revised: 2008-05-30


A vulnerability exists in OpenSSL that may allow a remote attacker to cause a denial of service.


OpenSSL contains a vulnerability in the way server name extension data is handled that may result in a denial of service. According to OpenSSL Security Advisory [28-Mar-2008]:

If OpenSSL has been compiled using the non-default TLS server name extensions, a remote attacker could send a carefully crafted packet to a server application using OpenSSL and cause it to crash.

Note that this issue may affect OpenSSL versions prior to 0.9.8h.


A remote, unauthorized attacker may be able to cause a denial of service.


Upgrade or Apply Patch
OpenSSL has issued an upgrade and a patch to address this issue. See OpenSSL Security Advisory [28-Mar-2008] for more information. OpenSSL is included in various Linux and UNIX distributions. Please consult the relevant documentation of your distribution to obtain the appropriate updates..

Vendor Information

Affected   Unknown   Unaffected


Updated:  May 30, 2008



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.


Refer to OpenSSL Security Advisory [28-Mar-2008] for more information.

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 issue was reported in OpenSSL Security Advisory [28-Mar-2008]. OpenSSL credits Codenomicon for reporting these issues.

This document was written by Chris Taschner.

Other Information

CVE IDs: CVE-2008-0891
Severity Metric: 14.88
Date Public: 2008-05-28
Date First Published: 2008-05-30
Date Last Updated: 2008-05-30 15:35 UTC
Document Revision: 7

Sponsored by CISA.