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Date: Fri, 07 Aug 2020 06:31:38 -0500
From: Daniel Ruggeri <>
Subject: CVE-2020-11993: Apache httpd: Push Diary Crash on Specifically Crafted HTTP/2 Header

CVE-2020-11993: Push Diary Crash on Specifically Crafted HTTP/2 Header

Severity: moderate

Vendor: Apache Software Foundation

Versions Affected:
Apache HTTP Server 2.4.20 to 2.4.43

Apache HTTP Server versions 2.4.20 to 2.4.43
When trace/debug was enabled for the HTTP/2 module and on
certain traffic edge patterns, logging statements were made on
the wrong connection, causing concurrent use of memory pools.

Configuring the LogLevel of mod_http2 above "info" will mitigate this vulnerability for unpatched servers.


Felix Wilhelm of Google Project Zero


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