CVE-2007-6203
MediumPublic exploitApache 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…
Published Dec 3, 2007 · Updated Aug 4, 2026 · Also known as DEBIAN-CVE-2007-6203
Key Facts
Patch immediately- CVE-2007-6203 is a medium-severity vulnerability (CVSS 4.3 v2) affecting HTTP Server (Apache), apache2 (debian), rootio-apache2.
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 81% probability of exploitation in the next 30 days.
- Fixed versions are available, including apache2 2.2.6-3, rootio-apache2 2.2.6-3.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v2
4.3
AV:N/AC:M/Au:N/C:N/I:P/A:N
EPSS (30-day exploit likelihood)
81%
Higher than 99.6% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
Available
Proof-of-concept or weaponized module
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Description
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.
Affected Products
38 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| HTTP ServerApache | 2.0.46, 2.0.47, 2.0.48, 2.0.49, 2.0.50, 2.0.51, 2.0.52, 2.0.53 | n/a |
| apache2debian | See advisory | 2.2.6-3 |
| rootio-apache2rootio | See advisory | 2.2.6-3 |
Patched Releases
apache2
2.2.6-3
rootio-apache2
2.2.6-3
Timeline
Publicly disclosed
Dec 3, 2007
Last updated
Aug 4, 2026
Weakness Type
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
References
FAQ
Common Questions.
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…
Affected: HTTP Server (Apache) versions 2.0.46, 2.0.47, 2.0.48, 2.0.49, 2.0.50, 2.0.51, 2.0.52, 2.0.53; apache2 (debian); rootio-apache2. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including apache2 2.2.6-3, rootio-apache2 2.2.6-3.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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