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.
5.4	$0-$5k	0.00

A vulnerability was found in RealVNC up to 4.0. It has been rated as critical. Affected by this issue is an unknown function of the component TCP Connection Handler. The manipulation as part of a 100 TCP Connections leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability. CVE summarizes:

RealVNC 4.0 and earlier allows remote attackers to cause a denial of service (crash) via a large number of connections to port 5900.

The bug was discovered 08/25/2004. The weakness was published 11/09/2004 by Allan Zhang (Dr_insane) (Website). The advisory is shared for download at secunia.com. This vulnerability is handled as CVE-2004-1750 since 02/26/2005. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are unknown but a public exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

A public exploit has been developed in ANSI C and been published immediately after the advisory. The exploit is available at securityfocus.com. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 76 days. During that time the estimated underground price was around $0-$5k.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at realvnc.com.Addressing this vulnerability is possible by firewalling . The best possible mitigation is suggested to be applying a restrictive firewalling.

The vulnerability is also documented in the vulnerability database at X-Force (17123).

Productinfo

Name

• RealVNC

Version

• 4.0

CPE 2.3info

• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.4

VulDB Base Score: 5.9
VulDB Temp Score: 5.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
ATT&CK: T1499

Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Programming Language: 🔍
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Firewall
Status: 🔍

0-Day Time: 🔍
Exploit Delay Time: 🔍

Patch: realvnc.com

Timelineinfo

08/25/2004 🔍
08/25/2004 +0 days 🔍
11/09/2004 +76 days 🔍
11/09/2004 +0 days 🔍
11/09/2004 +0 days 🔍
11/09/2004 +0 days 🔍
11/10/2004 +0 days 🔍
12/31/2004 +51 days 🔍
02/26/2005 +57 days 🔍
06/30/2019 +5237 days 🔍

Sourcesinfo

Advisory: secunia.com⛔
Researcher: Allan Zhang (Dr_insane)
Status: Not defined

CVE: CVE-2004-1750 (🔍)
X-Force: 17123 - RealVNC multiple connections allow denial of service, Medium Risk
SecurityFocus: 11048 - RealVNC Server Remote Denial of Service Vulnerability
Secunia: 13143 - RealVNC Multiple Connections Denial of Service Vulnerability, Less Critical
OSVDB: 11574 - RealVNC Multiple Port Connection Saturation DoS

scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 11/10/2004 10:52
Updated: 06/30/2019 09:39
Changes: 11/10/2004 10:52 (76), 06/30/2019 09:39 (3)
Complete: 🔍

Discussion

Want to stay up to date on a daily basis?

Enable the mail alert feature now!