{"id":"CVE-2021-44224","state":"PUBLISHED","title":"Possible NULL dereference or SSRF in forward proxy configurations in Apache HTTP Server 2.4.51 and earlier","description":"A crafted URI sent to httpd configured as a forward proxy (ProxyRequests on) can cause a crash (NULL pointer dereference) or, for configurations mixing forward and reverse proxy declarations, can allow for requests to be directed to a declared Unix Domain Socket endpoint (Server Side Request Forgery). This issue affects Apache HTTP Server 2.4.7 up to 2.4.51 (included).","publishedAt":"2021-12-20T11:20:13.000Z","updatedAt":"2024-08-04T04:17:24.919Z","severity":null,"assigner":"apache","products":["Apache Software Foundation Apache HTTP Server"],"affected":[{"vendor":"Apache Software Foundation","product":"Apache HTTP Server","versions":[{"version":"2.4.7","status":"affected","lessThan":"Apache HTTP Server 2.4*","versionType":"custom"}]}],"references":["http://httpd.apache.org/security/vulnerabilities_24.html","http://www.openwall.com/lists/oss-security/2021/12/20/3","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BFSWOH4X77CV7AH7C4RMHUBDWKQDL4YH/","https://www.debian.org/security/2022/dsa-5035","https://www.oracle.com/security-alerts/cpujan2022.html","https://security.netapp.com/advisory/ntap-20211224-0001/","https://www.tenable.com/security/tns-2022-01","https://www.tenable.com/security/tns-2022-03","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGWILBORT67SHMSLYSQZG2NMXGCMPUZO/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z7H26WJ6TPKNWV3QKY4BHKUKQVUTZJTD/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X73C35MMMZGBVPQQCH7LQZUMYZNQA5FO/","https://www.oracle.com/security-alerts/cpuapr2022.html","https://support.apple.com/kb/HT213257","https://support.apple.com/kb/HT213256","https://support.apple.com/kb/HT213255","http://seclists.org/fulldisclosure/2022/May/33","http://seclists.org/fulldisclosure/2022/May/35","http://seclists.org/fulldisclosure/2022/May/38","https://security.gentoo.org/glsa/202208-20"],"weaknesses":["CWE-476"],"ingestedAt":"2026-10-29T19:49:10.699Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/44xxx/CVE-2021-44224.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-44224","state":"PUBLISHED","datePublished":"2021-12-20T11:20:13.000Z","dateUpdated":"2024-08-04T04:17:24.919Z","assignerShortName":"apache","assignerOrgId":"f0158376-9dc2-43b6-827c-5f631a4d8d09","dateReserved":"2021-11-25T00:00:00.000Z"},"containers":{"cna":{"title":"Possible NULL dereference or SSRF in forward proxy configurations in Apache HTTP Server 2.4.51 and earlier","descriptions":[{"lang":"en","value":"A crafted URI sent to httpd configured as a forward proxy (ProxyRequests on) can cause a crash (NULL pointer dereference) or, for configurations mixing forward and reverse proxy declarations, can allow for requests to be directed to a declared Unix Domain Socket endpoint (Server Side Request Forgery). This issue affects Apache HTTP Server 2.4.7 up to 2.4.51 (included)."}],"affected":[{"vendor":"Apache Software Foundation","product":"Apache HTTP Server","versions":[{"version":"2.4.7","status":"affected","lessThan":"Apache HTTP Server 2.4*","versionType":"custom"}]}],"references":[{"url":"http://httpd.apache.org/security/vulnerabilities_24.html","tags":["x_refsource_MISC"]},{"url":"http://www.openwall.com/lists/oss-security/2021/12/20/3","name":"[oss-security] 20211220 CVE-2021-44224: Apache HTTP Server: Possible NULL dereference or SSRF in forward proxy configurations in Apache HTTP Server 2.4.51 and earlier","tags":["mailing-list","x_refsource_MLIST"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BFSWOH4X77CV7AH7C4RMHUBDWKQDL4YH/","name":"FEDORA-2021-29a536c2ae","tags":["vendor-advisory","x_refsource_FEDORA"]},{"url":"https://www.debian.org/security/2022/dsa-5035","name":"DSA-5035","tags":["vendor-advisory","x_refsource_DEBIAN"]},{"url":"https://www.oracle.com/security-alerts/cpujan2022.html","tags":["x_refsource_MISC"]},{"url":"https://security.netapp.com/advisory/ntap-20211224-0001/","tags":["x_refsource_CONFIRM"]},{"url":"https://www.tenable.com/security/tns-2022-01","tags":["x_refsource_CONFIRM"]},{"url":"https://www.tenable.com/security/tns-2022-03","tags":["x_refsource_CONFIRM"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGWILBORT67SHMSLYSQZG2NMXGCMPUZO/","name":"FEDORA-2022-b4103753e9","tags":["vendor-advisory","x_refsource_FEDORA"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z7H26WJ6TPKNWV3QKY4BHKUKQVUTZJTD/","name":"FEDORA-2022-21264ec6db","tags":["vendor-advisory","x_refsource_FEDORA"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X73C35MMMZGBVPQQCH7LQZUMYZNQA5FO/","name":"FEDORA-2022-78e3211c55","tags":["vendor-advisory","x_refsource_FEDORA"]},{"url":"https://www.oracle.com/security-alerts/cpuapr2022.html","tags":["x_refsource_MISC"]},{"url":"https://support.apple.com/kb/HT213257","tags":["x_refsource_CONFIRM"]},{"url":"https://support.apple.com/kb/HT213256","tags":["x_refsource_CONFIRM"]},{"url":"https://support.apple.com/kb/HT213255","tags":["x_refsource_CONFIRM"]},{"url":"http://seclists.org/fulldisclosure/2022/May/33","name":"20220516 APPLE-SA-2022-05-16-4 Security Update 2022-004 Catalina","tags":["mailing-list","x_refsource_FULLDISC"]},{"url":"http://seclists.org/fulldisclosure/2022/May/35","name":"20220516 APPLE-SA-2022-05-16-3 macOS Big Sur 11.6.6","tags":["mailing-list","x_refsource_FULLDISC"]},{"url":"http://seclists.org/fulldisclosure/2022/May/38","name":"20220516 APPLE-SA-2022-05-16-2 macOS Monterey 12.4","tags":["mailing-list","x_refsource_FULLDISC"]},{"url":"https://security.gentoo.org/glsa/202208-20","name":"GLSA-202208-20","tags":["vendor-advisory","x_refsource_GENTOO"]}],"metrics":[{"other":{"content":{"other":"moderate"},"type":"unknown"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-476","description":"CWE-476 NULL Pointer Dereference","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"apache","dateUpdated":"2022-08-14T01:08:09.000Z","orgId":"f0158376-9dc2-43b6-827c-5f631a4d8d09"},"credits":[{"lang":"en","value":"漂亮鼠"},{"lang":"en","value":"TengMA(@Te3t123)"}],"source":{"discovery":"UNKNOWN"},"timeline":[{"lang":"en","time":"2021-11-18T00:00:00.000Z","value":"Reported to security team"},{"lang":"en","time":"2021-12-14T00:00:00.000Z","value":"fixed by r1895955+r1896044 in 2.4.x"}],"x_generator":{"engine":"Vulnogram 0.0.9"},"x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"security@apache.org","ID":"CVE-2021-44224","STATE":"PUBLIC","TITLE":"Possible NULL dereference or SSRF in forward proxy configurations in Apache HTTP Server 2.4.51 and earlier"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"Apache HTTP Server","version":{"version_data":[{"version_affected":">=","version_name":"Apache HTTP Server 2.4","version_value":"2.4.7"},{"version_affected":"<=","version_name":"Apache HTTP Server 2.4","version_value":"2.4.51 +1"}]}}]},"vendor_name":"Apache Software Foundation"}]}},"credit":[{"lang":"eng","value":"漂亮鼠"},{"lang":"eng","value":"TengMA(@Te3t123)"}],"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"A crafted URI sent to httpd configured as a forward proxy (ProxyRequests on) can cause a crash (NULL pointer dereference) or, for configurations mixing forward and reverse proxy declarations, can allow for requests to be directed to a declared Unix Domain Socket endpoint (Server Side Request Forgery). This issue affects Apache HTTP Server 2.4.7 up to 2.4.51 (included)."}]},"generator":{"engine":"Vulnogram 0.0.9"},"impact":[{"other":"moderate"}],"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-476 NULL Pointer Dereference"}]}]},"references":{"reference_data":[{"name":"http://httpd.apache.org/security/vulnerabilities_24.html","refsource":"MISC","url":"http://httpd.apache.org/security/vulnerabilities_24.html"},{"name":"[oss-security] 20211220 CVE-2021-44224: Apache HTTP Server: Possible NULL dereference or SSRF in forward proxy configurations in Apache HTTP Server 2.4.51 and earlier","refsource":"MLIST","url":"http://www.openwall.com/lists/oss-security/2021/12/20/3"},{"name":"FEDORA-2021-29a536c2ae","refsource":"FEDORA","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BFSWOH4X77CV7AH7C4RMHUBDWKQDL4YH/"},{"name":"DSA-5035","refsource":"DEBIAN","url":"https://www.debian.org/security/2022/dsa-5035"},{"name":"https://www.oracle.com/security-alerts/cpujan2022.html","refsource":"MISC","url":"https://www.oracle.com/security-alerts/cpujan2022.html"},{"name":"https://security.netapp.com/advisory/ntap-20211224-0001/","refsource":"CONFIRM","url":"https://security.netapp.com/advisory/ntap-20211224-0001/"},{"name":"https://www.tenable.com/security/tns-2022-01","refsource":"CONFIRM","url":"https://www.tenable.com/security/tns-2022-01"},{"name":"https://www.tenable.com/security/tns-2022-03","refsource":"CONFIRM","url":"https://www.tenable.com/security/tns-2022-03"},{"name":"FEDORA-2022-b4103753e9","refsource":"FEDORA","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RGWILBORT67SHMSLYSQZG2NMXGCMPUZO/"},{"name":"FEDORA-2022-21264ec6db","refsource":"FEDORA","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/Z7H26WJ6TPKNWV3QKY4BHKUKQVUTZJTD/"},{"name":"FEDORA-2022-78e3211c55","refsource":"FEDORA","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X73C35MMMZGBVPQQCH7LQZUMYZNQA5FO/"},{"name":"https://www.oracle.com/security-alerts/cpuapr2022.html","refsource":"MISC","url":"https://www.oracle.com/security-alerts/cpuapr2022.html"},{"name":"https://support.apple.com/kb/HT213257","refsource":"CONFIRM","url":"https://support.apple.com/kb/HT213257"},{"name":"https://support.apple.com/kb/HT213256","refsource":"CONFIRM","url":"https://support.apple.com/kb/HT213256"},{"name":"https://support.apple.com/kb/HT213255","refsource":"CONFIRM","url":"https://support.apple.com/kb/HT213255"},{"name":"20220516 APPLE-SA-2022-05-16-4 Security Update 2022-004 Catalina","refsource":"FULLDISC","url":"http://seclists.org/fulldisclosure/2022/May/33"},{"name":"20220516 APPLE-SA-2022-05-16-3 macOS Big Sur 11.6.6","refsource":"FULLDISC","url":"http://seclists.org/fulldisclosure/2022/May/35"},{"name":"20220516 APPLE-SA-2022-05-16-2 macOS Monterey 12.4","refsource":"FULLDISC","url":"http://seclists.org/fulldisclosure/2022/May/38"},{"name":"GLSA-202208-20","refsource":"GENTOO","url":"https://security.gentoo.org/glsa/202208-20"}]},"source":{"discovery":"UNKNOWN"},"timeline":[{"lang":"en","time":"2021-11-18T00:00:00.000Z","value":"Reported to security team"},{"lang":"en","time":"2021-12-14T00:00:00.000Z","value":"fixed by r1895955+r1896044 in 2.4.x"}]}},"adp":[{"title":"CVE Program Container","references":[{"url":"http://httpd.apache.org/security/vulnerabilities_24.html","tags":["x_refsource_MISC","x_transferred"]},{"url":"http://www.openwall.com/lists/oss-security/2021/12/20/3","name":"[oss-security] 20211220 CVE-2021-44224: Apache HTTP Server: Possible NULL dereference or SSRF in forward proxy configurations in Apache HTTP Server 2.4.51 and earlier","tags":["mailing-list","x_refsource_MLIST","x_transferred"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BFSWOH4X77CV7AH7C4RMHUBDWKQDL4YH/","name":"FEDORA-2021-29a536c2ae","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred"]},{"url":"https://www.debian.org/security/2022/dsa-5035","name":"DSA-5035","tags":["vendor-advisory","x_refsource_DEBIAN","x_transferred"]},{"url":"https://www.oracle.com/security-alerts/cpujan2022.html","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://security.netapp.com/advisory/ntap-20211224-0001/","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"https://www.tenable.com/security/tns-2022-01","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"https://www.tenable.com/security/tns-2022-03","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGWILBORT67SHMSLYSQZG2NMXGCMPUZO/","name":"FEDORA-2022-b4103753e9","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z7H26WJ6TPKNWV3QKY4BHKUKQVUTZJTD/","name":"FEDORA-2022-21264ec6db","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X73C35MMMZGBVPQQCH7LQZUMYZNQA5FO/","name":"FEDORA-2022-78e3211c55","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred"]},{"url":"https://www.oracle.com/security-alerts/cpuapr2022.html","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://support.apple.com/kb/HT213257","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"https://support.apple.com/kb/HT213256","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"https://support.apple.com/kb/HT213255","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"http://seclists.org/fulldisclosure/2022/May/33","name":"20220516 APPLE-SA-2022-05-16-4 Security Update 2022-004 Catalina","tags":["mailing-list","x_refsource_FULLDISC","x_transferred"]},{"url":"http://seclists.org/fulldisclosure/2022/May/35","name":"20220516 APPLE-SA-2022-05-16-3 macOS Big Sur 11.6.6","tags":["mailing-list","x_refsource_FULLDISC","x_transferred"]},{"url":"http://seclists.org/fulldisclosure/2022/May/38","name":"20220516 APPLE-SA-2022-05-16-2 macOS Monterey 12.4","tags":["mailing-list","x_refsource_FULLDISC","x_transferred"]},{"url":"https://security.gentoo.org/glsa/202208-20","name":"GLSA-202208-20","tags":["vendor-advisory","x_refsource_GENTOO","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-04T04:17:24.919Z"}}]}}}