Is CVE-2009-3943 being actively exploited?

CVE-2009-3943 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2009-3943?

CVE-2009-3943 has a CVSS 2.0 base score of 5.0 (MEDIUM).

CVE-2009-3943

MEDIUM · CVSS 5.0EPSS 13.0%EU EUVD

Microsoft Internet Explorer 6 through 6.0.2900.2180 and 7 through 7.0.6000.16711 allows remote attackers to cause a denial of service (application hang) via a JavaScript loop that configures the home page by using the setHomePage method and a DHTML behavior property.

Key facts

CVSS score: 5.0 (v2.0)
Severity: MEDIUM
CVSS vector: AV:N/AC:L/Au:N/C:N/I:N/A:P
EPSS score: 13.0% (96th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2009-3914)
Published: November 16, 2009
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2009-3914 in the EU Vulnerability Database. Last updated in EUVD on August 7, 2024.

View on the EU Vulnerability Database

Affected products

microsoft / internet explorer

References

http://websecurity.com.ua/3658/(Exploit, Third Party Advisory)
http://www.securityfocus.com/archive/1/507731/100/0/threaded(Broken Link, Third Party Advisory, VDB Entry)
http://www.securityfocus.com/archive/1/507760/100/0/threaded(Broken Link, Third Party Advisory, VDB Entry)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

Query CVEs from your AI assistant

The CVE/NVD Explorer brain answers CVE questions directly inside Claude, ChatGPT, or any MCP assistant — always up to date, no setup. Add it once and stop pasting advisories into chat.

Add the CVE brain