{
  "GSD": {
    "alias": "CVE-2021-32778",
    "description": "Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. In affected versions envoy\u2019s 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.",
    "id": "GSD-2021-32778",
    "references": [
      "https://www.suse.com/security/cve/CVE-2021-32778.html",
      "https://access.redhat.com/errata/RHEA-2021:4051",
      "https://security.archlinux.org/CVE-2021-32778",
      "https://linux.oracle.com/cve/CVE-2021-32778.html"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
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      "aliases": [
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      "details": "Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. In affected versions envoy\u2019s 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.",
      "id": "GSD-2021-32778",
      "modified": "2023-12-13T01:23:09.147824Z",
      "schema_version": "1.4.0"
    }
  },
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        "TITLE": "Excessive CPU utilization when closing HTTP/2 streams"
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      "lastModifiedDate": "2022-06-15T15:49Z",
      "publishedDate": "2021-08-24T21:15Z"
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