CVE-2002-0155

Buffer overflow in Microsoft MSN Chat ActiveX Control, as used in MSN Messenger 4.5 and 4.6, and Exchange Instant Messenger 4.5 and 4.6, allows remote attackers to execute arbitrary code via a long ResDLL parameter in the MSNChat OCX.

Published: 2002-05-29 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2002-0155 is rated High Risk (69.1/100): CVSS High severity, with high exploitation likelihood (EPSS 24.10%, 98th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +4.97% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2002-0155

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 19.14% 24.10% +4.97%
2 2025-03-30 15.78% 19.14% +3.36%
3 2025-03-29 — 15.78% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2002-0155

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2002-0155

Affected software / configurations for CVE-2002-0155

Vendor Product Version Raw CPE
microsoft msn_chat_control — cpe:2.3:a:microsoft:msn_chat_control:*:*:*:*:*:*:*:*
microsoft msn_messenger 4.5 cpe:2.3:a:microsoft:msn_messenger:4.5:*:*:*:*:*:*:*
microsoft msn_messenger 4.6 cpe:2.3:a:microsoft:msn_messenger:4.6:*:*:*:*:*:*:*
microsoft msn_messenger_service_for_exchange 4.5 cpe:2.3:a:microsoft:msn_messenger_service_for_exchange:4.5:*:*:*:*:*:*:*
microsoft msn_messenger_service_for_exchange 4.6 cpe:2.3:a:microsoft:msn_messenger_service_for_exchange:4.6:*:*:*:*:*:*:*

References for CVE-2002-0155

cvelogic Threat Intelligence