Is CVE-2009-0804 being actively exploited?

CVE-2009-0804 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2009-0804?

CVE-2009-0804 has a CVSS 2.0 base score of 5.4 (MEDIUM).

CVE-2009-0804

MEDIUM · CVSS 5.4EPSS 2.4%EU EUVD

Ziproxy 2.6.0, when transparent interception mode is enabled, uses the HTTP Host header to determine the remote endpoint, which allows remote attackers to bypass access controls for Flash, Java, Silverlight, and probably other technologies, and possibly communicate with restricted intranet sites, via a crafted web page that causes a client to send HTTP requests with a modified Host header.

Key facts

CVSS score: 5.4 (v2.0)
Severity: MEDIUM
CVSS vector: AV:N/AC:H/Au:N/C:C/I:N/A:N
Weakness (CWE): CWE-264
EPSS score: 2.4% (84th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2009-0802)
Published: March 4, 2009
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2009-0802 in the EU Vulnerability Database. Last updated in EUVD on September 16, 2024.

View on the EU Vulnerability Database

Affected products

ziproxy / ziproxy

References

http://www.kb.cert.org/vuls/id/435052(Third Party Advisory, US Government Resource)
http://www.kb.cert.org/vuls/id/MAPG-7N9GN8(Vendor Advisory)
http://www.securityfocus.com/bid/33858

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

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