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Squid < 2.7.STABLE6 / 3.0.STABLE13 / HTTP Version Numbers DoS



The remote proxy server is susceptible to a denial of service attack.


The version of the Squid proxy caching server installed on the remote host may abort when parsing requests with an invalid HTTP version. A remote attacker may be able to leverage this issue to crash the application, thereby denying service to legitimate users.

Note that successful exploitation of this issue requires that Squid was not built with the 'NODEBUG' define.


Either apply the appropriate patches referenced in the project's advisory above or upgrade to version 2.7.STABLE6 / 3.0.STABLE13 / or higher.