Vulnerability Report

CVE-2009-4171

Title: Yahoo Messenger Memory Corruption

Memory Corruption

Proof Of Concept

PoC Available for CVE-2009-4171

CWE Category CWE-119

Published Date Dec 02, 2009

Modified Date Jun 16, 2026

Exploit Status Available

Score 4.3 CVSS v2.0

Exploit Probability (EPSS)

5.09%

Vulnerability Summary

CVE-2009-4171: 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.

Impacted Vendors

yahoo 1

relatedcode 1

Reference Links

http://www.securityfocus.com/archive/1/507818/100/0/threaded http://www.securityfocus.com/bid/37007 https://exchange.xforce.ibmcloud.com/vulnerabilities/54263 http://www.securityfocus.com/archive/1/507818/100/0/threaded http://www.securityfocus.com/bid/37007 https://exchange.xforce.ibmcloud.com/vulnerabilities/54263

CVSS v2.0

Source Entity [email protected]

Severity MEDIUM

4.3

Access Vector

N/A

Authentication

N/A

RAW VECTOR AV:N/AC:M/Au:N/C:N/I:N/A:P

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2009-4171 Exploits & PoCs (Proof Of Concept)

Exploit-DB https://www.exploit-db.com/exploits/33350

View Code

Exploit-DB https://www.exploit-db.com/exploits/10092

View Code

June 16, 2026 MODIFIED

Vulnerability data updated via NVD.

April 09, 2025 MODIFIED

Vulnerability data or affected products updated.

December 02, 2009 PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector N/A

Complexity N/A

Privileges N/A

Interaction NONE

CVSS Vector String


                                    AV:N/AC:M/Au:N/C:N/I:N/A:P

Affected Stack

No specific products linked.