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Age in Days
CVSS Score
Patch within next
Risk Level



30 Days



This vulnerability is 7 years 4 months and 27 days old there are exploits publicly available for it. The vulnerability itself is over a year old, and with there being exploits publicly available it is highly advisable that this vulnerability is patched immediately.



The web server running on the remote host is affected by a denial of service vulnerability.


Vulnerability Description

The version of Apache HTTP Server running on the remote host is affected by a denial of service vulnerability. Making a series of HTTP requests with overlapping ranges in the Range or Request-Range request headers can result in memory and CPU exhaustion. A remote, unauthenticated attacker could exploit this to make the system unresponsive.

Exploit code is publicly available and attacks have reportedly been observed in the wild.



Upgrade to Apache httpd 2.2.21 or later. Alternatively, apply one of the workarounds in Apache's advisories for CVE-2011-3192. Version 2.2.20 fixed the issue, but it also introduced a regression.

If the host is running a web server based on Apache httpd, contact the vendor for a fix.


Further Information


CVE References

CVE-2011-3192 NIST | MITRE | CVEDetails


Get in touch

Should you have any questions regarding this or any security matter, please do not hesitate to get in touch by emailing the Hedgehog Cyber Operations Team.

Whilst every effort is made to ensure the accuracy and robustness of any information presented, it is not possible for Hedgehog Cyber to test every possible scenario an organisation may face, and Hedgehog Cyber cannot be held liable for any loss or damage which may arise from taking action on any of the contents provided. Hedgehog Cyber strongly advises that all recommendations, solutions and detection methods detailed, are thoroughly reviewed and tested in non-production environments before being considered suitable for production release, in-line with any existing internal change control procedures.