CVE-2021-31618CWE-476

CVE-2021-31618: vulnerability in Apache HTTP Server

NULL pointer dereference on specially crafted HTTP/2 request

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15Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackepss 52%
Apache HTTP Server protocol handler for the HTTP/2 protocol checks received request headers against the size limitations as configured for the server and used for the HTTP/1 protocol as well. On violation of these restrictions and HTTP response is sent to the client with a status code indicating why the request was rejected. This rejection response was not fully initialised in the HTTP/2 protocol handler if the offending header was the very first one received or appeared in a a footer. This led to a NULL pointer dereference on initialised memory, crashing reliably the child process. Since such a triggering HTTP/2 request is easy to craft and submit, this can be exploited to DoS the server. This issue affected mod_http2 1.15.17 and Apache HTTP Server version 2.4.47 only. Apache HTTP Server 2.4.47 was never released.
Affected products
Apache Software Foundation · Apache HTTP Server
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