{"schema_version":"1.8.0","id":"CVE-2021-40438","published":"2021-09-16T15:15:07.633Z","modified":"2026-08-07T03:30:17.209832720Z","aliases":["BIT-apache-2021-40438"],"related":["ALBA-2021:4604","ALSA-2021:3816","ALSA-2021:4537","SUSE-SU-2021:3299-1","SUSE-SU-2021:3335-1","SUSE-SU-2021:3522-1","openSUSE-SU-2021:1438-1","openSUSE-SU-2021:3522-1","openSUSE-SU-2025:14708-1"],"details":"A crafted request uri-path can cause mod_proxy to forward the request to an origin server choosen by the remote user. This issue affects Apache HTTP Server 2.4.48 and earlier.","affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/apache/httpd","events":[{"introduced":"0"},{"last_affected":"c37a3162d1c0aeb6f3b80e831243daf61596ac87"}],"database_specific":{"cpe":"cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"last_affected":"2.4.48"}],"source":"CPE_RANGE"}}],"versions":["2.4.48"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-40438.json"}}],"references":[{"type":"WEB","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-40438"},{"type":"ADVISORY","url":"https://cert-portal.siemens.com/productcert/pdf/ssa-685781.pdf"},{"type":"ADVISORY","url":"https://httpd.apache.org/security/vulnerabilities_24.html"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2021/10/msg00001.html"},{"type":"ADVISORY","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPBR6WUYBJNACHKE65SPL7TJOHX7RHWD/"},{"type":"ADVISORY","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNCYSR3BXT36FFF4XTCPL3HDQK4VP45R/"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/202208-20"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20211008-0004/"},{"type":"ADVISORY","url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQ"},{"type":"ADVISORY","url":"https://www.debian.org/security/2021/dsa-4982"},{"type":"ADVISORY","url":"https://www.tenable.com/security/tns-2021-17"},{"type":"FIX","url":"https://www.oracle.com/security-alerts/cpuapr2022.html"},{"type":"FIX","url":"https://www.oracle.com/security-alerts/cpujan2022.html"},{"type":"ARTICLE","url":"https://lists.apache.org/thread.html/r210807d0bb55f4aa6fbe1512be6bcc4dacd64e84940429fba329967a%40%3Cusers.httpd.apache.org%3E"},{"type":"ARTICLE","url":"https://lists.apache.org/thread.html/r2eb200ac1340f69aa22af61ab34780c531d110437910cb9c0ece3b37%40%3Cbugs.httpd.apache.org%3E"},{"type":"ARTICLE","url":"https://lists.apache.org/thread.html/r3925e167d5eb1c75def3750c155d753064e1d34a143028bb32910432%40%3Cusers.httpd.apache.org%3E"},{"type":"ARTICLE","url":"https://lists.apache.org/thread.html/r61fdbfc26ab170f4e6492ef3bd5197c20b862ce156e9d5a54d4b899c%40%3Cusers.httpd.apache.org%3E"},{"type":"ARTICLE","url":"https://lists.apache.org/thread.html/r82838efc5fa6fc4c73986399c9b71573589f78b31846aff5bd9b1697%40%3Cusers.httpd.apache.org%3E"},{"type":"ARTICLE","url":"https://lists.apache.org/thread.html/r82c077663f9759c7df5a6656f925b3ee4f55fcd33c889ba7cd687029%40%3Cusers.httpd.apache.org%3E"},{"type":"ARTICLE","url":"https://lists.apache.org/thread.html/rf6954e60b1c8e480678ce3d02f61b8a788997785652e9557a3265c00%40%3Cusers.httpd.apache.org%3E"}],"database_specific":{"unresolved_ranges":[{"cpes":["cpe:2.3:o:f5:f5os:*:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"1.1.0"},{"last_affected":"1.1.4"},{"introduced":"1.2.0"},{"last_affected":"1.2.1"}],"source":"CPE_RANGE","vendor_product":"f5:f5os"},{"cpes":["cpe:2.3:a:siemens:sinec_nms:*:*:*:*:*:*:*:*"],"extracted_events":[{"fixed":"1.0.3"}],"source":"CPE_RANGE","vendor_product":"siemens:sinec_nms"},{"cpes":["cpe:2.3:a:siemens:sinema_remote_connect_server:*:*:*:*:*:*:*:*"],"extracted_events":[{"fixed":"3.1"}],"source":"CPE_RANGE","vendor_product":"siemens:sinema_remote_connect_server"},{"cpes":["cpe:2.3:a:tenable:tenable.sc:*:*:*:*:*:*:*:*"],"extracted_events":[{"last_affected":"5.19.1"}],"source":"CPE_RANGE","vendor_product":"tenable:tenable.sc"},{"cpes":["cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*","cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*","cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"9.0"},{"last_affected":"9.0"},{"introduced":"10.0"},{"last_affected":"10.0"},{"introduced":"11.0"},{"last_affected":"11.0"}],"source":"CPE_STRING","vendor_product":"debian:debian_linux"},{"cpes":["cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*","cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"34"},{"last_affected":"34"},{"introduced":"35"},{"last_affected":"35"}],"source":"CPE_STRING","vendor_product":"fedoraproject:fedora"},{"cpes":["cpe:2.3:a:oracle:enterprise_manager_ops_center:12.4.0.0:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"12.4.0.0"},{"last_affected":"12.4.0.0"}],"source":"CPE_STRING","vendor_product":"oracle:enterprise_manager_ops_center"},{"cpes":["cpe:2.3:a:oracle:http_server:12.2.1.3.0:*:*:*:*:*:*:*","cpe:2.3:a:oracle:http_server:12.2.1.4.0:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"12.2.1.3.0"},{"last_affected":"12.2.1.3.0"},{"introduced":"12.2.1.4.0"},{"last_affected":"12.2.1.4.0"}],"source":"CPE_STRING","vendor_product":"oracle:http_server"},{"cpes":["cpe:2.3:a:oracle:instantis_enterprisetrack:17.1:*:*:*:*:*:*:*","cpe:2.3:a:oracle:instantis_enterprisetrack:17.2:*:*:*:*:*:*:*","cpe:2.3:a:ora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