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Fencer Vulns
medium 4.3

CVE-2007-6203 json

Apache HTTP Server 2.0.x and 2.2.x does not sanitize the HTTP Method specifier header from an HTTP request when it is reflected back in a "…

published 2007-12-03 18 y ago modified 2026-06-16 4 mo ago also EUVD-2007-6171

cvss
4.3
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
80.7%
EPSS 80.7% chance of exploitation in 30 days, percentile 99.6%
public exploits
1
Exploit-DB

Summary

Apache HTTP Server 2.0.x and 2.2.x does not sanitize the HTTP Method specifier header from an HTTP request when it is reflected back in a "413 Request Entity Too Large" error message, which might allow cross-site scripting (XSS) style attacks using web client components that can send arbitrary headers in requests, as demonstrated via an HTTP request containing an invalid Content-length value, a similar issue to CVE-2006-3918.

Patch / fix

  • apache2 Debian 14, Debian 13, Debian 12 2.2.6-3

debian advisories DEBIAN-CVE-2007-6203

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2007-6203 updated

httpd: Garbage before http method name is not escaped in a reply in case of errorneous request

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. First public exploit (EDB-30835)
  2. Published

Exploit prediction

80.75% chance of exploitation in the next 30 days, higher than 99.6% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-30835 Apache 2.2.4 - 413 Error HTTP Request Method Cross-Site Scripting remote, 2007-11-30
  • securityfocus.com http://www.securityfocus.com/bid/26663 referenced PoC, tagged "exploit" by a source, unverified
  • procheckup.com http://procheckup.com/Vulnerability_PR07-37.php referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.