{"cve":{"cve_id":"CVE-2021-43557","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.14589,"epss_percentile":0.96203,"epss_as_of":"2026-06-23","description":"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.","published_at":"2021-11-22T08:25:09Z","last_modified_at":null,"cvss_v3_score":null,"cvss_v3_vector":null,"cvss_v3_severity":null,"cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":null,"nvd_references":["https://lists.apache.org/thread/18jyd458ptocr31rnkjs71w4h366mv7h","http://www.openwall.com/lists/oss-security/2021/11/22/1","http://www.openwall.com/lists/oss-security/2021/11/22/2","http://www.openwall.com/lists/oss-security/2021/11/23/1"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-06-28T23:16:21.280568Z"},"effective_severity":null,"badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":null,"metrics":[]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"apache-software-foundation","vendor_name":"Apache Software Foundation","product_slug":"apache-apisix","product_name":"Apache APISIX","version_start":"1.5","version_start_inclusive":true,"version_end":"Apache APISIX 1.5*","version_end_inclusive":false,"cpe23_uri":"cve5:apache-software-foundation:apache-apisix:1.5:Apache APISIX 1.5*"}],"exploit_refs":[],"news":[],"references":[{"url":"https://lists.apache.org/thread/18jyd458ptocr31rnkjs71w4h366mv7h","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"http://www.openwall.com/lists/oss-security/2021/11/22/1","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"http://www.openwall.com/lists/oss-security/2021/11/22/2","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"http://www.openwall.com/lists/oss-security/2021/11/23/1","source_type":"MAILING_LIST","tags":["mailing-list"]}],"timeline":[{"type":"published","at":"2021-11-22T08:25:09Z","label":"CVE published","source":null}]}