{"document":{"aggregate_severity":{"namespace":"https://www.suse.com/support/security/rating/","text":"important"},"category":"csaf_vex","csaf_version":"2.0","distribution":{"text":"Copyright 2024 SUSE LLC. All rights reserved.","tlp":{"label":"WHITE","url":"https://www.first.org/tlp/"}},"lang":"en","notes":[{"category":"summary","text":"SUSE CVE-2021-32778","title":"Title"},{"category":"description","text":"Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. In affected versions envoy's procedure for resetting a HTTP/2 stream has O(N^2) complexity, leading to high CPU utilization when a large number of streams are reset. Deployments are susceptible to Denial of Service when Envoy is configured with high limit on H/2 concurrent streams. An attacker wishing to exploit this vulnerability would require a client opening and closing a large number of H/2 streams. Envoy versions 1.19.1, 1.18.4, 1.17.4, 1.16.5 contain fixes to reduce time complexity of resetting HTTP/2 streams. As a workaround users may limit the number of simultaneous HTTP/2 dreams for upstream and downstream peers to a low number, i.e. 100.","title":"Description of the CVE"},{"category":"legal_disclaimer","text":"CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).","title":"Terms of use"}],"publisher":{"category":"vendor","contact_details":"https://www.suse.com/support/security/contact/","name":"SUSE Product Security Team","namespace":"https://www.suse.com/"},"references":[{"category":"external","summary":"CVE-2021-32778","url":"https://www.suse.com/security/cve/CVE-2021-32778"},{"category":"external","summary":"SUSE Security Ratings","url":"https://www.suse.com/support/security/rating/"},{"category":"external","summary":"SUSE Bug 1189801 for CVE-2021-32778","url":"https://bugzilla.suse.com/1189801"}],"title":"SUSE CVE CVE-2021-32778","tracking":{"current_release_date":"2025-12-19T02:01:22Z","generator":{"date":"2024-06-04T12:57:27Z","engine":{"name":"cve-database.git:bin/generate-csaf-vex.pl","version":"1"}},"id":"CVE-2021-32778","initial_release_date":"2024-06-04T12:57:27Z","revision_history":[{"date":"2024-06-04T12:57:27Z","number":"2","summary":"Current version"},{"date":"2025-01-01T04:25:51Z","number":"3","summary":"Current version"},{"date":"2025-02-15T05:00:28Z","number":"4","summary":"Current version"},{"date":"2025-02-17T05:23:04Z","number":"5","summary":"Current version"},{"date":"2025-12-17T01:50:41Z","number":"6","summary":"description changed"},{"date":"2025-12-19T02:01:22Z","number":"7","summary":"description changed"}],"status":"interim","version":"7"}}}