{"id":"BIT-apisix-2021-43557","summary":"Path traversal in request_uri variable","details":"The uri-block plugin in Apache APISIX before 2.10.2 uses $request_uri without verification. The $request_uri is the full original request URI without normalization. This makes it possible to construct a URI to bypass the block list on some occasions. For instance, when the block list contains \"^/internal/\", a URI like `//internal/` can be used to bypass it. Some other plugins also have the same issue. And it may affect the developer's custom plugin.","aliases":["CVE-2021-43557"],"modified":"2026-09-08T08:45:32.645752803Z","published":"2024-03-06T10:51:17.884Z","database_specific":{"severity":"High","cpes":["cpe:2.3:a:apache:apisix:*:*:*:*:*:*:*:*"]},"references":[{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2021/11/22/1"},{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2021/11/22/2"},{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2021/11/23/1"},{"type":"ADVISORY","url":"https://lists.apache.org/thread/18jyd458ptocr31rnkjs71w4h366mv7h"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-43557"}],"affected":[{"package":{"name":"apisix","ecosystem":"Bitnami","purl":"pkg:bitnami/apisix"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.10.2"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/apisix/BIT-apisix-2021-43557.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"}]}],"schema_version":"1.9.0"}