CVE-2002-0823

Windows Help - Remote Code Execution via HTML Help ActiveX Control Item Parameter

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2002-0823. PoCs published by Next Generation Security.

AI-analyzed exploit summary This exploit leverages a buffer overflow in the HTML Help ActiveX control (Hhctrl.ocx) via the WinHlp command's Item parameter. The malicious OBJECT tag and embedded script trigger arbitrary code execution when rendered in Internet Explorer.

Description

Buffer overflow in Winhlp32.exe allows remote attackers to execute arbitrary code via an HTML document that calls the HTML Help ActiveX control (HHCtrl.ocx) with a long pathname in the Item parameter.

Exploits (1)

exploitdb WORKING POC VERIFIED
by Next Generation Security · textremotewindows
https://www.exploit-db.com/exploits/21485

This exploit leverages a buffer overflow in the HTML Help ActiveX control (Hhctrl.ocx) via the WinHlp command's Item parameter. The malicious OBJECT tag and embedded script trigger arbitrary code execution when rendered in Internet Explorer.

Classification
Working Poc 90%
Attack Type
Rce
Complexity
Trivial
Reliability
Reliable
Target: Microsoft HTML Help (Winhlp32.exe), Internet Explorer
No auth needed
Prerequisites: Victim must visit a malicious webpage or open a malicious HTML email
mistral-large-3 · analyzed Feb 16, 2026 Full analysis →

References (5)

Core 5
Core References
Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/4857
Third Party Advisory, VDB Entry vdb-entry x_refsource_osvdb
http://www.osvdb.org/2991
Third Party Advisory vdb-entry x_refsource_xf
http://www.iss.net/security_center/static/9746.php
Vendor Advisory vendor-advisory x_refsource_mskb
http://support.microsoft.com/default.aspx?scid=kb%3Ben-us%3Bq293338
Mailing List mailing-list x_refsource_bugtraq
http://marc.info/?l=bugtraq&m=102822806329440&w=2

Scores

EPSS 0.2617
EPSS Percentile 97.8%

Details

Status published
Products (2)
microsoft/windows_2000 (2 CPE variants)
microsoft/windows_help
Published Aug 12, 2002
Tracked Since Feb 18, 2026