Yahoo! Messenger 9.0.0.2162 ActiveX Control YahooBridgeLib.dll memory corruption

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.
4.8	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Yahoo! Messenger 9.0.0.2162. The impacted element is an unknown function in the library YahooBridgeLib.dll of the component ActiveX Control. Performing a manipulation results in memory corruption. This vulnerability was named CVE-2009-4171. In addition, an exploit is available.

Detailsinfo

A vulnerability classified as problematic has been found in Yahoo! Messenger 9.0.0.2162 (Messaging Software). This affects an unknown functionality in the library YahooBridgeLib.dll of the component ActiveX Control. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on availability. The summary by CVE is:

An ActiveX control in YahooBridgeLib.dll for Yahoo! Messenger 9.0.0.2162, and possibly other 9.0 versions, allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) by calling the RegisterMe method with a long argument.

The weakness was presented 12/02/2009 (Website). It is possible to read the advisory at xforce.iss.net. This vulnerability is uniquely identified as CVE-2009-4171. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details and a public exploit are known.

The exploit is shared for download at securityfocus.com. It is declared as proof-of-concept. The commercial vulnerability scanner Qualys is able to test this issue with plugin 116701 (Yahoo! Messenger 'YahooBridgeLib.dll' ActiveX Control Remote Denial of Service Vulnerability).

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 (54263), Exploit-DB (33350), SecurityFocus (BID 37007†) and Vulnerability Center (SBV-25611†). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Messaging Software

Vendor

Yahoo!

Name

Messenger

Version

9.0.0.2162

License

free

Website

Vendor: https://www.yahoo.com/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 4.8

VulDB Base Score: 5.3
VulDB Temp Score: 4.8
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: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

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

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

OpenVAS ID: 801150
OpenVAS Name: Yahoo! Messenger YahooBridgeLib.dll ActiveX Control DOS Vulnerability
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

11/12/2009 🔍
11/12/2009 +0 days 🔍
12/02/2009 +19 days 🔍
12/02/2009 +0 days 🔍
12/02/2009 +0 days 🔍
05/05/2010 +154 days 🔍
03/18/2015 +1778 days 🔍
10/14/2025 +3863 days 🔍

Sourcesinfo

Vendor: yahoo.com

Advisory: xforce.iss.net
Status: Not defined

CVE: CVE-2009-4171 (🔍)
GCVE (CVE): GCVE-0-2009-4171
GCVE (VulDB): GCVE-100-51003
X-Force: 54263
SecurityFocus: 37007 - Yahoo! Messenger 'YahooBridgeLib.dll' ActiveX Control Remote Denial of Service Vulnerability
Vulnerability Center: 25611 - Yahoo! Messenger ActiveX Control Remote DoS Vulnerability via the RegisterMe Method, Medium

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

Entryinfo

Created: 03/18/2015 15:15
Updated: 10/14/2025 18:28
Changes: 03/18/2015 15:15 (52), 02/24/2017 09:41 (12), 08/28/2021 10:18 (3), 02/09/2025 00:13 (20), 10/14/2025 18:28 (2)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.