LibVNCServer up to 0.9.9 rfbProcessClientNormalMessage data processing

CVSS Meta Temp Score
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CTI Interest Score
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A vulnerability was found in LibVNCServer up to 0.9.9. It has been declared as problematic. Affected by this vulnerability is the function rfbProcessClientNormalMessage. The manipulation with an unknown input leads to a data processing vulnerability. The CWE definition for the vulnerability is CWE-19. As an impact it is known to affect availability. The summary by CVE is:

The rfbProcessClientNormalMessage function in libvncserver/rfbserver.c in LibVNCServer 0.9.9 and earlier does not properly handle attempts to send a large amount of ClientCutText data, which allows remote attackers to cause a denial of service (memory consumption or daemon crash) via a crafted message that is processed by using a single unchecked malloc.

The weakness was released 12/15/2014 by Nicolas Ruff as confirmed advisory ( It is possible to read the advisory at This vulnerability is known as CVE-2014-6053 since 09/01/2014. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 79203 (RHEL 7 : kdenetwork (RHSA-2014:1827)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Red Hat Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 168339 (SUSE Enterprise Linux Security update for LibVNCServer (SUSE-SU-2015:2088-2)).

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 (96190) and Tenable (79203).





CPE 2.3info

CPE 2.2info


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VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.3
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Class: Data processing

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

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Nessus ID: 79203
Nessus Name: RHEL 7 : kdenetwork (RHSA-2014:1827)
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OpenVAS ID: 703081
OpenVAS Name: Debian Security Advisory DSA 3081-1 (libvncserver - security update)
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Threat Intelligenceinfo

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Recommended: no mitigation known
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09/01/2014 🔍
09/23/2014 +22 days 🔍
09/24/2014 +1 days 🔍
10/01/2014 +7 days 🔍
11/12/2014 +42 days 🔍
11/18/2014 +6 days 🔍
12/15/2014 +27 days 🔍
12/15/2014 +0 days 🔍
03/27/2015 +102 days 🔍
04/07/2022 +2568 days 🔍


Advisory: RHSA-2014:1827
Researcher: Nicolas Ruff
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2014-6053 (🔍)

X-Force: 96190
Vulnerability Center: 47118 - LibVNCServer 0.9.9 Remote DoS Vulnerability via a ClientCutText Message, Medium
SecurityFocus: 70092 - LibVNCServer CVE-2014-6053 Remote Denial of Service Vulnerability
Secunia: 61506 - LibVNCServer Multiple Vulnerabilities, Moderately Critical


Created: 03/27/2015 02:56 PM
Updated: 04/07/2022 08:44 PM
Changes: 03/27/2015 02:56 PM (70), 06/12/2017 08:23 AM (7), 04/07/2022 08:29 PM (4), 04/07/2022 08:37 PM (1), 04/07/2022 08:44 PM (2)
Complete: 🔍
Cache ID: 100:AEB:40


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