{"id":"ALPINE-CVE-2021-31618","details":"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.","modified":"2025-12-03T22:48:36.574383Z","published":"2021-06-15T09:15:07.960Z","upstream":["CVE-2021-31618"],"references":[{"type":"ADVISORY","url":"https://security.alpinelinux.org/vuln/CVE-2021-31618"}],"affected":[{"package":{"name":"apache2","ecosystem":"Alpine:v3.10","purl":"pkg:apk/alpine/apache2?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.48-r0"}]}],"versions":["2.2.16-r0","2.2.16-r1","2.2.16-r2","2.2.16-r3","2.2.17-r0","2.2.17-r1","2.2.17-r2","2.2.17-r3","2.2.17-r4","2.2.17-r5","2.2.20-r0","2.2.21-r0","2.2.21-r1","2.2.21-r2","2.2.21-r3","2.2.22-r0","2.2.22-r1","2.4.10-r0","2.4.12-r0","2.4.12-r1","2.4.12-r2","2.4.12-r3","2.4.12-r4","2.4.16-r0","2.4.17-r0","2.4.17-r1","2.4.17-r2","2.4.17-r3","2.4.17-r4","2.4.17-r5","2.4.17-r6","2.4.17-r7","2.4.18-r0","2.4.18-r1","2.4.18-r2","2.4.20-r0","2.4.20-r1","2.4.20-r2","2.4.23-r0","2.4.23-r1","2.4.23-r10","2.4.23-r2","2.4.23-r3","2.4.23-r4","2.4.23-r5","2.4.23-r6","2.4.23-r7","2.4.23-r8","2.4.23-r9","2.4.25-r0","2.4.25-r1","2.4.26-r0","2.4.27-r0","2.4.27-r1","2.4.27-r2","2.4.28-r0","2.4.29-r0","2.4.29-r1","2.4.3-r0","2.4.3-r1","2.4.3-r2","2.4.33-r0","2.4.33-r1","2.4.34-r0","2.4.35-r0","2.4.37-r0","2.4.37-r1","2.4.38-r0","2.4.38-r1","2.4.38-r2","2.4.39-r0","2.4.4-r0","2.4.4-r1","2.4.41-r0","2.4.43-r0","2.4.46-r0","2.4.6-r0","2.4.6-r1","2.4.6-r2","2.4.6-r3","2.4.6-r4","2.4.7-r0","2.4.9-r0","2.4.9-r1"],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-31618.json"}},{"package":{"name":"apache2","ecosystem":"Alpine:v3.11","purl":"pkg:apk/alpine/apache2?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.48-r0"}]}],"versions":["2.2.16-r0","2.2.16-r1","2.2.16-r2","2.2.16-r3","2.2.17-r0","2.2.17-r1","2.2.17-r2","2.2.17-r3","2.2.17-r4","2.2.17-r5","2.2.20-r0","2.2.21-r0","2.2.21-r1","2.2.21-r2","2.2.21-r3","2.2.22-r0","2.2.22-r1","2.4.10-r0","2.4.12-r0","2.4.12-r1","2.4.12-r2","2.4.12-r3","2.4.12-r4","2.4.16-r0","2.4.17-r0","2.4.17-r1","2.4.17-r2","2.4.17-r3","2.4.17-r4","2.4.17-r5","2.4.17-r6","2.4.17-r7","2.4.18-r0","2.4.18-r1","2.4.18-r2","2.4.20-r0","2.4.20-r1","2.4.20-r2","2.4.23-r0","2.4.23-r1","2.4.23-r10","2.4.23-r2","2.4.23-r3","2.4.23-r4","2.4.23-r5","2.4.23-r6","2.4.23-r7","2.4.23-r8","2.4.23-r9","2.4.25-r0","2.4.25-r1","2.4.26-r0","2.4.27-r0","2.4.27-r1","2.4.27-r2","2.4.28-r0","2.4.29-r0","2.4.29-r1","2.4.3-r0","2.4.3-r1","2.4.3-r2","2.4.33-r0","2.4.33-r1","2.4.34-r0","2.4.35-r0","2.4.37-r0","2.4.37-r1","2.4.38-r0","2.4.38-r1","2.4.38-r2","2.4.39-r0","2.4.4-r0","2.4.4-r1","2.4.41-r0","2.4.43-r0","2.4.46-r0","2.4.6-r0","2.4.6-r1","2.4.6-r2","2.4.6-r3","2.4.6-r4","2.4.7-r0","2.4.9-r0","2.4.9-r1"],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-31618.json"}},{"package":{"name":"apache2","ecosystem":"Alpine:v3.12","purl":"pkg:apk/alpine/apache2?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.48-r0"}]}],"versions":["2.2.16-r0","2.2.16-r1","2.2.16-r2","2.2.16-r3","2.2.17-r0","2.2.17-r1","2.2.17-r2","2.2.17-r3","2.2.17-r4","2.2.17-r5","2.2.20-r0","2.2.21-r0","2.2.21-r1","2.2.21-r2","2.2.21-r3","2.2.22-r0","2.2.22-r1","2.4.10-r0","2.4.12-r0","2.4.12-r1","2.4.12-r2","2.4.12-r3","2.4.12-r4","2.4.16-r0","2.4.17-r0","2.4.17-r1","2.4.17-r2","2.4.17-r3","2.4.17-r4","2.4.17-r5","2.4.17-r6","2.4.17-r7","2.4.18-r0","2.4.18-r1","2.4.18-r2","2.4.20-r0","2.4.20-r1","2.4.20-r2","2.4.23-r0","2.4.23-r1","2.4.23-r10","2.4.23-r2","2.4.23-r3","2.4.23-r4","2.4.23-r5","2.4.23-r6","2.4.23-r7","2.4.23-r8","2.4.23-r9","2.4.25-r0","2.4.25-r1","2.4.26-r0","2.4.27-r0","2.4.27-r1","2.4.27-r2","2.4.28-r0","2.4.29-r0","2.4.29-r1","2.4.3-r0","2.4.3-r1","2.4.3-r2","2.4.33-r0","2.4.33-r1","2.4.34-r0","2.4.35-r0","2.4.37-r0","2.4.37-r1","2.4.38-r0","2.4.38-r1","2.4.38-r2","2.4.39-r0","2.4.4-r0","2.4.4-r1","2.4.41-r0","2.4.43-r0","2.4.46-r0","2.4.46-r1","2.4.6-r0","2.4.6-r1","2.4.6-r2","2.4.6-r3","2.4.6-r4","2.4.7-r0","2.4.9-r0","2.4.9-r1"],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-31618.json"}},{"package":{"name":"apache2","ecosystem":"Alpine:v3.13","purl":"pkg:apk/alpine/apache2?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.48-r0"}]}],"versions":["2.2.16-r0","2.2.16-r1","2.2.16-r2","2.2.16-r3","2.2.17-r0","2.2.17-r1","2.2.17-r2","2.2.17-r3","2.2.17-r4","2.2.17-r5","2.2.20-r0","2.2.21-r0","2.2.21-r1","2.2.21-r2","2.2.21-r3","2.2.22-r0","2.2.22-r1","2.4.10-r0","2.4.12-r0","2.4.12-r1","2.4.12-r2","2.4.12-r3","2.4.12-r4","2.4.16-r0","2.4.17-r0","2.4.17-r1","2.4.17-r2","2.4.17-r3","2.4.17-r4","2.4.17-r5","2.4.17-r6","2.4.17-r7","2.4.18-r0","2.4.18-r1","2.4.18-r2","2.4.20-r0","2.4.20-r1","2.4.20-r2","2.4.23-r0","2.4.23-r1","2.4.23-r10","2.4.23-r2","2.4.23-r3","2.4.23-r4","2.4.23-r5","2.4.23-r6","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