{"id":"CVE-2021-39204","aliases":["BIT-envoy-2021-39204","EUVD-2021-1989","GHSA-5wjf-62hw-q78r"],"status":"published","title":"Excessive CPU usage in Pomerium","description":"Pomerium is an open source identity-aware access proxy. Envoy, which Pomerium is based on, incorrectly handles resetting of HTTP/2 streams with excessive complexity. This can lead to high CPU utilization when a large number of streams are reset. This can result in a DoS condition. Pomerium versions 0.14.8 and 0.15.1 contain an upgraded envoy binary with this vulnerability patched.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.01662,"percentile":0.77005,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-834"],"published":"2021-09-09T22:10:09Z","modified":"2026-10-20T10:54:53Z","fixes":[{"ecosystem":"Go","package":"github.com/pomerium/pomerium","fixed_in":["0.14.8","0.15.1"],"sources":["ghsa","osv"]},{"ecosystem":"Bitnami","package":"envoy","fixed_in":["1.16.5","1.17.4","1.18.4","1.19.1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"Go","package":"github.com/pomerium/pomerium","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.14.8"}]}]},{"source":"ghsa","ecosystem":"Go","package":"github.com/pomerium/pomerium","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.15.0"},{"last_affected":"0.15.0"},{"fixed":"0.15.1"}]}],"versions":["0.15.0"]},{"source":"osv","ecosystem":"Bitnami","package":"envoy","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.16.5"},{"introduced":"1.17.0"},{"fixed":"1.17.4"},{"introduced":"1.18.0"},{"fixed":"1.18.4"},{"introduced":"1.19.0"},{"fixed":"1.19.1"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/pomerium/pomerium","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.14.8"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/pomerium/pomerium","ranges":[{"type":"SEMVER","events":[{"introduced":"0.15.0"},{"fixed":"0.15.1"}]}],"versions":["0.15.0"]}],"products":[{"vendor":"envoyproxy","product":"envoy"},{"vendor":"pomerium","product":"pomerium"}],"references":[{"url":"https://groups.google.com/g/envoy-announce/c/5xBpsEZZDfE/m/wD05NZBbAgAJ","tags":["x_refsource_MISC","x_transferred","Not Applicable","web"]},{"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-3xh3-33v5-chcc","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://github.com/pomerium/pomerium/security/advisories/GHSA-5wjf-62hw-q78r","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-39204","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-5wjf-62hw-q78r"},{"url":"https://github.com/pomerium/pomerium","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2021-39204","title":"Excessive CPU usage in Pomerium","description":"Pomerium is an open source identity-aware access proxy. Envoy, which Pomerium is based on, incorrectly handles resetting of HTTP/2 streams with excessive complexity. This can lead to high CPU utilization when a large number of streams are reset. This can result in a DoS condition. Pomerium versions 0.14.8 and 0.15.1 contain an upgraded envoy binary with this vulnerability patched.","status":"published","published":"2021-09-09T22:10:09Z","modified":"2024-08-04T01:58:18.254Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-834"],"updated_at":"2026-11-02T14:33:09.864034Z"}],"euvd":[{"id":"EUVD-2021-1989","description":"Pomerium is an open source identity-aware access proxy. Envoy, which Pomerium is based on, incorrectly handles resetting of HTTP/2 streams with excessive complexity. This can lead to high CPU utilization when a large number of streams are reset. This can result in a DoS condition. Pomerium versions 0.14.8 and 0.15.1 contain an upgraded envoy binary with this vulnerability patched.","status":"published","published":"2021-09-09T22:10:09Z","modified":"2024-08-04T01:58:18Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-03T03:24:24.305495Z"}],"ghsa":[{"id":"GHSA-5wjf-62hw-q78r","title":"Excessive CPU usage","description":"Envoy, which Pomerium is based on, incorrectly handles resetting of HTTP/2 streams with excessive complexity.  This can lead to high CPU utilization when a large number of streams are reset.  \n\n### Impact\n\nThis can result in a DoS condition.\n\n### Patches\nPomerium versions 0.14.8 and 0.15.1 contain an upgraded envoy binary with this vulnerability patched.\n\n### Workarounds\nN/A\n\n### References\n[envoy GSA](https://github.com/envoyproxy/envoy/security/advisories/GHSA-3xh3-33v5-chcc)\n[envoy CVE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-32778)\n[envoy announcement](https://groups.google.com/g/envoy-announce/c/5xBpsEZZDfE/m/wD05NZBbAgAJ)\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [pomerium/pomerium](https://github.com/pomerium/pomerium/issues)\n* Email us at [security@pomerium.com](mailto:security@pomerium.com)\n","status":"published","published":"2021-09-10T17:54:13Z","modified":"2023-02-01T05:06:09Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-834"],"updated_at":"2026-11-02T14:36:37.441118Z"}],"nvd":[{"id":"CVE-2021-39204","description":"Pomerium is an open source identity-aware access proxy. Envoy, which Pomerium is based on, incorrectly handles resetting of HTTP/2 streams with excessive complexity. This can lead to high CPU utilization when a large number of streams are reset. This can result in a DoS condition. Pomerium versions 0.14.8 and 0.15.1 contain an upgraded envoy binary with this vulnerability patched.","status":"published","published":"2021-09-09T22:15:09.773Z","modified":"2026-06-17T04:03:18.433Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-834"],"updated_at":"2026-11-02T14:06:58.502206Z"}],"osv":[{"id":"CVE-2021-39204","description":"Pomerium is an open source identity-aware access proxy. Envoy, which Pomerium is based on, incorrectly handles resetting of HTTP/2 streams with excessive complexity. This can lead to high CPU utilization when a large number of streams are reset. This can result in a DoS condition. Pomerium versions 0.14.8 and 0.15.1 contain an upgraded envoy binary with this vulnerability patched.","status":"published","published":"2021-09-09T22:15:09.773Z","modified":"2026-10-20T10:54:53.129462595Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:20.843843Z"},{"id":"GHSA-5wjf-62hw-q78r","title":"Excessive CPU usage","description":"Envoy, which Pomerium is based on, incorrectly handles resetting of HTTP/2 streams with excessive complexity.  This can lead to high CPU utilization when a large number of streams are reset.  \n\n### Impact\n\nThis can result in a DoS condition.\n\n### Patches\nPomerium versions 0.14.8 and 0.15.1 contain an upgraded envoy binary with this vulnerability patched.\n\n### Workarounds\nN/A\n\n### References\n[envoy GSA](https://github.com/envoyproxy/envoy/security/advisories/GHSA-3xh3-33v5-chcc)\n[envoy CVE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-32778)\n[envoy announcement](https://groups.google.com/g/envoy-announce/c/5xBpsEZZDfE/m/wD05NZBbAgAJ)\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [pomerium/pomerium](https://github.com/pomerium/pomerium/issues)\n* Email us at [security@pomerium.com](mailto:security@pomerium.com)\n","status":"published","published":"2021-09-10T17:54:13Z","modified":"2026-02-04T03:45:50.973535Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-834"],"updated_at":"2026-11-02T15:46:38.911014Z"},{"id":"BIT-envoy-2021-39204","title":"Excessive CPU usage in Pomerium","description":"Pomerium is an open source identity-aware access proxy. Envoy, which Pomerium is based on, incorrectly handles resetting of HTTP/2 streams with excessive complexity. This can lead to high CPU utilization when a large number of streams are reset. This can result in a DoS condition. Pomerium versions 0.14.8 and 0.15.1 contain an upgraded envoy binary with this vulnerability patched.","status":"published","published":"2024-03-06T10:57:21.991Z","modified":"2026-09-08T08:47:27.433889931Z","updated_at":"2026-11-02T15:28:29.563843Z"}]}}