What’s Vulnerable › Vulnerabilities

CVE-1999-1577

• Severity: medium (CVSS 5.1 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 19.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2005-04-21 · updated 2026-06-16

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.

Affected products

• Microsoft Internet Explorer 11: 4.0.1, 5.0

References

• http://www.kb.cert.org/vuls/id/29795
• http://www.securityfocus.com/archive/1/28719
• http://www.securityfocus.com/bid/669
• https://exchange.xforce.ibmcloud.com/vulnerabilities/3314
• http://www.kb.cert.org/vuls/id/29795
• http://www.securityfocus.com/archive/1/28719
• http://www.securityfocus.com/bid/669
• https://exchange.xforce.ibmcloud.com/vulnerabilities/3314

Get alerted when CVE-1999-1577 or the next vulnerability affects your stack