CVE-1999-1577

critical

Description

Buffer overflow in HHOpen ActiveX control (hhopen.ocx) 1.0.0.1 for Internet Explorer 4.01 and 5 allows remote attackers to execute arbitrary commands via long arguments to the OpenHelp method.

References

https://exchange.xforce.ibmcloud.com/vulnerabilities/3314

http://www.securityfocus.com/bid/669

http://www.securityfocus.com/archive/1/28719

http://www.kb.cert.org/vuls/id/29795

Details

Source: Mitre, NVD

Published: 1999-10-31

Updated: 2026-06-16

Risk Information

CVSS v2

Base Score: 5.1

Vector: CVSS2#AV:N/AC:H/Au:N/C:P/I:P/A:P

Severity: Medium

CVSS v3

Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

EPSS

EPSS: 0.19487

Detections

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