{"cve":{"cve_id":"CVE-2020-13943","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":0.54966,"epss_percentile":0.99017,"epss_as_of":"2026-10-15","description":"If an HTTP/2 client connecting to Apache Tomcat 10.0.0-M1 to 10.0.0-M7, 9.0.0.M1 to 9.0.37 or 8.5.0 to 8.5.57 exceeded the agreed maximum number of concurrent streams for a connection (in violation of the HTTP/2 protocol), it was possible that a subsequent request made on that connection could contain HTTP headers - including HTTP/2 pseudo headers - from a previous request rather than the intended headers. This could lead to users seeing responses for unexpected resources.","published_at":"2020-10-12T13:46:47Z","last_modified_at":"2026-10-08T22:16:56.900000Z","cvss_v3_score":4.3,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","cvss_v3_severity":"MEDIUM","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.html/r4a390027eb27e4550142fac6c8317cc684b157ae314d31514747f307%40%3Cannounce.tomcat.apache.org%3E","https://lists.debian.org/debian-lts-announce/2020/10/msg00019.html","http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00002.html","http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00021.html","https://www.debian.org/security/2021/dsa-4835","https://www.oracle.com/security-alerts/cpuApr2021.html","https://security.netapp.com/advisory/ntap-20201016-0007/"],"vuln_status":"Modified","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":"2026-10-10T21:36:59.224259Z"},"effective_severity":"MEDIUM","badges":["epss"],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack 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Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"L","value_label":"Low"},{"metric":"I","name":"Integrity","value":"N","value_label":"None"},{"metric":"A","name":"Availability","value":"N","value_label":"None"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"apache","vendor_name":"apache","product_slug":"tomcat","product_name":"Tomcat","version_start":"8.5.0","version_start_inclusive":true,"version_end":"8.5.0","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:apache:tomcat:8.5.0:*:*:*:*:*:*:*"},{"vendor_slug":"apache","vendor_name":"apache","product_slug":"tomcat","product_name":"Tomcat","version_start":"8.5.1","version_start_inclusive":true,"version_end":"8.5.1","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:apache:tomcat:8.5.1:*:*:*:*:*:*:*"},{"vendor_slug":"apache","vendor_name":"apache","product_slug":"tomcat","product_name":"Tomcat","version_start":"8.5.2","version_start_inclusive":true,"version_end":"8.5.2","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:apache:tomcat:8.5.2:*:*:*:*:*:*:*"},{"vendor_slug":"apache","vendor_name":"apache","product_slug":"tomcat","product_name":"Tomcat","version_start":"8.5.3","version_start_inclusive":true,"version_end":"8.5.3","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:apache:tomcat:8.5.3:*:*:*:*:*:*:*"},{"vendor_slug":"apache","vendor_name":"apache","product_slug":"tomcat","product_name":"Tomcat","version_start":"8.5.4","version_start_inclusive":true,"version_end":"8.5.4","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:apache:tomcat:8.5.4:*:*:*:*:*:*:*"},{"vendor_slug":"apache","vendor_name":"apache","product_slug":"tomcat","product_name":"Tomcat","version_start":"8.5.5","version_start_inclusive":true,"version_end":"8.5.5","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:apache:tomcat:8.5.5:*:*:*:*:*:*:*"},{"vendor_slug":"apache","vendor_name":"apache","product_slug":"tomcat","product_name":"Tomcat","version_start":"8.5.6","version_start_inclusive":true,"version_end":"8.5.6","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:apache:tomcat:8.5.6:*:*:*:*:*:*:*"},{"vendor_slug":"apache","vendor_name":"apache","product_slug":"tomcat","product_name":"Tomcat","version_start":"8.5.7","version_start_inclusive":true,"version_end":"8.5.7","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:apache:tomcat:8.5.7:*:*:*:*:*:*:*"},{"vendor_slug":"apache","vendor_name":"apache","product_slug":"tomcat","product_name":"Tomcat","version_start":"8.5.8","version_start_inclusive":true,"version_end":"8.5.8","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:apache:tomcat:8.5.8:*:*:*:*:*:*:*"},{"vendor_slug":"apache","vendor_name":"apache","product_slug":"tomcat","product_name":"Tomcat","version_start":"8.5.9","version_start_inclusive":true,"version_end":"8.5.9","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:apache:tomcat:8.5.9:*:*:*:*:*:*:*"},{"vendor_slug":"apache","vendor_name":"apache","product_slug":"tomcat","product_name":"Tomcat","version_start":"8.5.10","version_start_inclusive":true,"version_end":"8.5.10","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:apache:tomcat:8.5.10:*:*:*:*:*:*:*"},{"vendor_slug":"apache","vendor_name":"apache","product_slug":"tomcat","product_name":"Tomcat","version_start":"8.5.11","version_start_inclusive":true,"version_end":"8.5.11","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:apache:tomcat:8.5.11:*:*:*:*:*:*:*"},{"vendor_slug":"apache","vendor_name":"apache","product_slug":"tomcat","product_name":"Tomcat","version_start":"8.5.12","version_start_inclusive":true,"version_end":"8.5.12","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:apache:tomcat:8.5.12:*:*:*:*:*:*:*"},{"vendor_slug":"apache","vendor_name":"apache","product_slug":"tomcat","product_name":"Tomcat","version_start":"8.5.13","version_start_inclusive":true,"version_end":"8.5.13","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:apache:tomcat:8.5.13:*:*:*:*:*:*:*"},{"vendor_slug":"apache","vendor_name":"apache","product_slug":"tomcat","product_name":"Tomcat","version_start":"8.5.14","version_start_inclusive":true,"version_end":"8.5.14","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:apache:tomcat:8.5.14:*:*:*:*:*:*:*"},{"vendor_slug":"apache","vendor_name":"apache","product_slug":"tomcat","product_name":"Tomcat","version_start":"8.5.15","version_start_inclusive":true,"version_end":"8.5.15","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:apache:tomcat:8.5.15:*:*:*:*:*:*:*"},{"vendor_slug":"apache","vendor_name":"apache","product_slug":"tomcat","product_name":"Tomcat","version_start":"8.5.16","version_start_inclusive":true,"version_end":"8.5.16","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:apache:tomcat:8.5.16:*:*:*:*:*:*:*"},{"vendor_slug":"apache","vendor_name":"apache","product_slug":"tomcat","product_name":"Tomcat","version_start":"8.5.17","version_start_inclusive":true,"version_end":"8.5.17"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