{"id":"CVE-2020-13950","aliases":["ALPINE-CVE-2020-13950","AZL-6474","BELL-CVE-2020-13950","BIT-apache-2020-13950","DEBIAN-CVE-2020-13950","EUVD-2020-6133","GHSA-pqc6-p826-c5qw","MGASA-2021-0265","OESA-2021-1246","RHSA-2021:4614","RHSA-2022:5163","RLSA-2022:5163","SUSE-SU-2021:2127-1","UBUNTU-CVE-2020-13950","USN-4994-1","openSUSE-SU-2021:0908-1","openSUSE-SU-2021:2127-1"],"status":"published","title":"mod_proxy_http NULL pointer dereference","description":"Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer dereference) with specially crafted requests using both Content-Length and Transfer-Encoding headers, leading to a Denial of Service","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.50023,"percentile":0.98921,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-476"],"published":"2021-06-10T07:10:21Z","modified":"2026-10-26T12:02:25Z","fixes":[{"ecosystem":"Alpine:v3.10","package":"apache2","fixed_in":["2.4.48-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.11","package":"apache2","fixed_in":["2.4.48-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.12","package":"apache2","fixed_in":["2.4.48-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.13","package":"apache2","fixed_in":["2.4.48-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.14","package":"apache2","fixed_in":["2.4.48-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.15","package":"apache2","fixed_in":["2.4.48-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.16","package":"apache2","fixed_in":["2.4.48-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.17","package":"apache2","fixed_in":["2.4.48-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.18","package":"apache2","fixed_in":["2.4.48-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.19","package":"apache2","fixed_in":["2.4.48-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.20","package":"apache2","fixed_in":["2.4.48-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"apache2","fixed_in":["2.4.48-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"apache2","fixed_in":["2.4.48-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"apache2","fixed_in":["2.4.48-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"apache2","fixed_in":["2.4.48-r0"],"sources":["osv"]},{"ecosystem":"Azure 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versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer dereference) with specially crafted requests using both Content-Length and Transfer-Encoding headers, leading to a Denial of Service","status":"published","published":"2022-05-24T19:04:56Z","modified":"2023-01-29T05:06:59Z","cwes":["CWE-476"],"updated_at":"2026-11-02T14:46:07.768849Z"}],"nvd":[{"id":"CVE-2020-13950","description":"Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer dereference) with specially crafted requests using both Content-Length and Transfer-Encoding headers, leading to a Denial of Service","status":"published","published":"2021-06-10T07:15:07.44Z","modified":"2026-06-17T02:53:58.863Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:06:43.288951Z"}],"osv":[{"id":"ALPINE-CVE-2020-13950","description":"Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer dereference) with specially crafted requests using both Content-Length and Transfer-Encoding headers, leading to a Denial of Service","status":"published","published":"2021-06-10T07:15:07.44Z","modified":"2026-10-26T11:17:55.114303935Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:27:48.11886Z"},{"id":"AZL-6474","title":"CVE-2020-13950 affecting package httpd for versions less than 2.4.46-10","description":"Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer dereference) with specially crafted requests using both Content-Length and Transfer-Encoding headers, leading to a Denial of Service","status":"published","published":"2021-06-10T07:15:07Z","modified":"2026-04-21T04:32:31.956772Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:28:08.076947Z"},{"id":"BELL-CVE-2020-13950","title":"CVE-2020-13950 does not affect BellSoft software","status":"withdrawn","published":"2023-08-31T12:15:25.903501Z","modified":"2026-01-26T09:47:31.783673Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:28:15.340685Z"},{"id":"CVE-2020-13950","description":"Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer dereference) with specially crafted requests using both Content-Length and Transfer-Encoding headers, leading to a Denial of Service","status":"published","published":"2021-06-10T07:15:07.44Z","modified":"2026-10-24T10:30:53.239438348Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:14.418339Z"},{"id":"DEBIAN-CVE-2020-13950","description":"Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer dereference) with specially crafted requests using both Content-Length and Transfer-Encoding headers, leading to a Denial of Service","status":"published","published":"2021-06-10T07:15:07.44Z","modified":"2026-10-26T12:02:25.933658907Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:32.862554Z"},{"id":"OESA-2021-1246","title":"httpd security update","description":"Apache HTTP Server is a powerful and flexible HTTP/1.1 compliant web server.\r\n\r\nSecurity Fix(es):\r\n\r\nIn Apache HTTP Server versions 2.4.0 to 2.4.46 a specially crafted SessionHeader sent by an origin server could cause a heap overflow(CVE-2021-26691)\r\n\r\nApache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer dereference) with specially crafted requests using both Content-Length and Transfer-Encoding headers, leading to a Denial of Service(CVE-2020-13950)\r\n\r\nApache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Digest nonce can cause a stack overflow in mod_auth_digest. There is no report of this overflow being exploitable, nor the Apache HTTP Server team could create one, though some particular compiler and/or compilation option might make it possible, with limited consequences anyway due to the size (a single byte) and the value (zero byte) of the overflow(CVE-2020-35452)\n\nApache HTTP Server versions 2.4.39 to 2.4.46 Unexpected matching behavior with MergeSlashes OFF(CVE-2021-30641)","status":"published","published":"2021-06-26T11:04:29Z","modified":"2026-08-18T01:15:45.628373805Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:52:38.987987Z"},{"id":"RHSA-2021:4614","title":"Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.37 SP10 security update","status":"published","published":"2024-09-29T18:13:51Z","modified":"2026-10-09T10:02:55Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:09.077222Z"},{"id":"RHSA-2022:5163","title":"Red Hat Security Advisory: httpd:2.4 security update","status":"published","published":"2024-09-13T22:15:36Z","modified":"2026-09-21T10:03:49Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:09.62945Z"},{"id":"RLSA-2022:5163","title":"Low: httpd:2.4 security update","description":"The httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server.\n\nSecurity Fix(es):\n\n* httpd: mod_proxy NULL pointer dereference (CVE-2020-13950)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.","status":"published","published":"2022-06-22T09:23:56Z","modified":"2026-02-05T05:00:13.598706Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:24.322216Z"},{"id":"UBUNTU-CVE-2020-13950","description":"Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer dereference) with specially crafted requests using both Content-Length and Transfer-Encoding headers, leading to a Denial of Service","status":"published","published":"2021-06-10T07:15:00Z","modified":"2026-04-22T12:29:34.858485Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:54:22.804634Z"},{"id":"BIT-apache-2020-13950","title":"mod_proxy_http NULL pointer dereference","description":"Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer dereference) with specially crafted requests using both Content-Length and Transfer-Encoding headers, leading to a Denial of Service","status":"published","published":"2024-03-06T10:57:17.183Z","modified":"2026-09-08T08:45:27.48235626Z","updated_at":"2026-11-02T15:28:28.267217Z"},{"id":"MGASA-2021-0265","title":"Updated apache packages fix security vulnerabilities","description":"mod_proxy_wstunnel tunneling of non Upgraded connections: Apache HTTP Server \nversions 2.4.6 to 2.4.46 mod_proxy_wstunnel configured on an URL that is not \nnecessarily Upgraded by the origin server was tunneling the whole connection \nregardless, thus allowing for subsequent requests on the same connection to \npass through with no HTTP validation, authentication or authorization \npossibly configured. (CVE-2019-17567).\n   \nmod_proxy_http NULL pointer dereference: Apache HTTP Server versions 2.4.41 \nto 2.4.46 mod_proxy_http can be made to crash (NULL pointer dereference) with \nspecially crafted requests using both Content-Length and Transfer-Encoding \nheaders, leading to a Denial of Service (CVE-2020-13950).\n\nmod_auth_digest possible stack overflow by one nul byte: Apache HTTP Server \nversions 2.4.0 to 2.4.46 A specially crafted Digest nonce can cause a stack \noverflow in mod_auth_digest. There is no report of this overflow being \nexploitable, nor the Apache HTTP Server team could create one, though some \nparticular compiler and/or compilation option might make it possible, with \nlimited consequences anyway due to the size (a single byte) and the value \n(zero byte) of the overflow (CVE-2020-35452).\n\nmod_session NULL pointer dereference: Apache HTTP Server versions 2.4.0 to \n2.4.46 A specially crafted Cookie header handled by mod_session can cause a \nNULL pointer dereference and crash, leading to a possible Denial Of Service \n(CVE-2021-26690).\n\nmod_session response handling heap overflow: Apache HTTP Server versions \n2.4.0 to 2.4.46 A specially crafted SessionHeader sent by an origin server \ncould cause a heap overflow (CVE-2021-26691).\n\nUnexpected URL matching with 'MergeSlashes OFF': Apache HTTP Server versions \n2.4.39 to 2.4.46 Unexpected matching behavior with 'MergeSlashes \nOFF'(CVE-2021-30641).\n\nNULL pointer dereference on specially crafted HTTP/2 request: Apache HTTP \nServer protocol handler for the HTTP/2 protocol checks received request \nheaders against the size limitations as configured for the server and used \nfor the HTTP/1 protocol as well. On violation of these restrictions and HTTP \nresponse is sent to the client with a status code indicating why the request \nwas rejected. This rejection response was not fully initialised in the HTTP/2 \nprotocol handler if the offending header was the very first one received or \nappeared in a footer. This led to a NULL pointer dereference on initialised \nmemory, crashing reliably the child process. Since such a triggering HTTP/2 \nrequest is easy to craft and submit, this can be exploited to DoS the server. \nThis issue affected mod_http2 1.15.17 and Apache HTTP Server version 2.4.47 \nonly. Apache HTTP Server 2.4.47 was never released. (CVE-2021-31618).\n","status":"published","published":"2021-06-16T20:22:25Z","modified":"2026-04-16T04:44:03.928538971Z","updated_at":"2026-11-02T15:49:41.509337Z"},{"id":"openSUSE-SU-2021:0908-1","title":"Security update for apache2","description":"This update for apache2 fixes the following issues:\n\n- fixed CVE-2021-30641 [bsc#1187174]: MergeSlashes regression\n- fixed CVE-2021-31618 [bsc#1186924]: NULL pointer dereference on specially crafted HTTP/2 request\n- fixed CVE-2020-13950 [bsc#1187040]: mod_proxy NULL pointer dereference\n- fixed CVE-2020-35452 [bsc#1186922]: Single zero byte stack overflow in mod_auth_digest \n- fixed CVE-2021-26690 [bsc#1186923]: mod_session NULL pointer dereference in parser\n- fixed CVE-2021-26691 [bsc#1187017]: Heap overflow in mod_session\n","status":"published","published":"2021-06-24T09:52:47Z","modified":"2026-02-04T03:49:43.716266Z","updated_at":"2026-11-02T16:58:31.879684Z"},{"id":"openSUSE-SU-2021:2127-1","title":"Security update for apache2","description":"This update for apache2 fixes the following issues:\n\n- fixed CVE-2021-30641 [bsc#1187174]: MergeSlashes regression\n- fixed CVE-2021-31618 [bsc#1186924]: NULL pointer dereference on specially crafted HTTP/2 request\n- fixed CVE-2020-13950 [bsc#1187040]: mod_proxy NULL pointer dereference\n- fixed CVE-2020-35452 [bsc#1186922]: Single zero byte stack overflow in mod_auth_digest \n- fixed CVE-2021-26690 [bsc#1186923]: mod_session NULL pointer dereference in parser\n- fixed CVE-2021-26691 [bsc#1187017]: Heap overflow in mod_session\n","status":"published","published":"2021-07-10T13:52:30Z","modified":"2026-02-04T02:55:40.053532Z","updated_at":"2026-11-02T16:58:32.266854Z"},{"id":"SUSE-SU-2021:2127-1","title":"Security update for apache2","description":"This update for apache2 fixes the following issues:\n\n- fixed CVE-2021-30641 [bsc#1187174]: MergeSlashes regression\n- fixed CVE-2021-31618 [bsc#1186924]: NULL pointer dereference on specially crafted HTTP/2 request\n- fixed CVE-2020-13950 [bsc#1187040]: mod_proxy NULL pointer dereference\n- fixed CVE-2020-35452 [bsc#1186922]: Single zero byte stack overflow in mod_auth_digest \n- fixed CVE-2021-26690 [bsc#1186923]: mod_session NULL pointer dereference in parser\n- fixed CVE-2021-26691 [bsc#1187017]: Heap overflow in mod_session\n","status":"published","published":"2021-06-22T14:41:02Z","modified":"2026-02-04T03:13:18.563118Z","updated_at":"2026-11-02T15:53:49.138643Z"},{"id":"USN-4994-1","title":"apache2 vulnerabilities","description":"Marc Stern discovered that the Apache mod_proxy_http module incorrectly\nhandled certain requests. A remote attacker could possibly use this issue\nto cause Apache to crash, resulting in a denial of service. This issue only\naffected Ubuntu 20.04 LTS, Ubuntu 20.10, and Ubuntu 21.04. (CVE-2020-13950)\n\nAntonio Morales discovered that the Apache mod_auth_digest module\nincorrectly handled certain Digest nonces. A remote attacker could possibly\nuse this issue to cause Apache to crash, resulting in a denial of service.\n(CVE-2020-35452)\n\nAntonio Morales discovered that the Apache mod_session module incorrectly\nhandled certain Cookie headers. A remote attacker could possibly use this\nissue to cause Apache to crash, resulting in a denial of service.\n(CVE-2021-26690)\n\nChristophe Jaillet discovered that the Apache mod_session module\nincorrectly handled certain SessionHeader values. A remote attacker could\nuse this issue to cause Apache to crash, resulting in a denial of service,\nor possibly execute arbitrary code. (CVE-2021-26691)\n\nChristoph Anton Mitterer discovered that the new MergeSlashes configuration\noption resulted in unexpected behaviour in certain situations.\n(CVE-2021-30641)\n","status":"published","published":"2021-06-21T14:01:37Z","modified":"2026-04-22T10:15:05.675179Z","updated_at":"2026-11-02T16:58:15.683829Z"}]}}