CVE ID:	CVE-2021-31618
Description:	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.
Test IDs:	1.3.6.1.4.1.25623.1.1.4.2021.2006.1   1.3.6.1.4.1.25623.1.1.4.2021.2127.1   1.3.6.1.4.1.25623.1.0.853882   1.3.6.1.4.1.25623.1.0.112904   1.3.6.1.4.1.25623.1.0.879766   1.3.6.1.4.1.25623.1.0.853930   1.3.6.1.4.1.25623.1.0.879764   1.3.6.1.4.1.25623.1.0.112905
Cross References:	Common Vulnerability Exposure (CVE) ID: CVE-2021-31618 https://security.netapp.com/advisory/ntap-20210727-0008/ Debian Security Information: DSA-4937 (Google Search) https://www.debian.org/security/2021/dsa-4937 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2NKJ3ZA3FTSZ2QBBPKS6BYGAWYRABNQQ/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/A73QJ4HPUMU26I6EULG6SCK67TUEXZYR/ https://security.gentoo.org/glsa/202107-38 http://httpd.apache.org/security/vulnerabilities_24.html http://httpd.apache.org/security/vulnerabilities_24.html https://seclists.org/oss-sec/2021/q2/206 https://seclists.org/oss-sec/2021/q2/206 https://www.oracle.com/security-alerts/cpuoct2021.html https://www.oracle.com/security-alerts/cpuoct2021.html https://lists.debian.org/debian-lts-announce/2021/07/msg00006.html https://lists.apache.org/thread.html/r783b6558abf3305b17ea462bed4bd66d82866438999bf38cef6d11d1@%3Ccvs.httpd.apache.org%3E https://lists.apache.org/thread.html/r14b66ef0f4f569fd515a3f96cd4eb58bd9a8ff525cc326bb0359664f@%3Ccvs.httpd.apache.org%3E http://www.openwall.com/lists/oss-security/2021/06/10/9 http://www.openwall.com/lists/oss-security/2024/03/13/2