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Date: Wed, 14 Aug 2019 15:50:09 -0500
From: Daniel Ruggeri <>
Subject: CVE-2019-9517: mod_http2, DoS attack by exhausting h2 workers

CVE-2019-9517: mod_http2, DoS attack by exhausting h2 workers.

Severity: Moderate

Vendor: The Apache Software Foundation

Versions Affected:
httpd 2.4.20 to 2.4.39

A malicious client could perform a DoS attack by flooding
a connection with requests and basically never reading responses
on the TCP connection. Depending on h2 worker dimensioning, it was
possible to block those with relatively few connections.
All httpd users deploying mod_http2 should upgrade to 2.4.40 or later.
Unpatched servers can disable HTTP/2 protocol.

The issue was discovered by Jonathan Looney of Netflix.


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