{"id":"CVE-2021-39162","aliases":["BIT-envoy-2021-39162","EUVD-2021-2061","GHSA-gjcg-vrxg-xmgv","GO-2022-0933"],"status":"published","title":"Incorrect handling of H2 GOAWAY + SETTINGS frames","description":"Pomerium is an open source identity-aware access proxy. Envoy, which Pomerium is based on, can abnormally terminate if an H/2 GOAWAY and SETTINGS frame are received in the same IO event. This can lead to a DoS in the presence of untrusted *upstream* servers. 0.15.1 contains an upgraded envoy binary with this vulnerability patched. If only trusted upstreams are configured, there is not substantial risk of this condition being triggered.","severity":{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.01638,"percentile":0.76546,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-754"],"published":"2021-09-09T22:05:11Z","modified":"2026-10-20T10:54:53Z","fixes":[{"ecosystem":"Go","package":"github.com/pomerium/pomerium","fixed_in":["0.15.1"],"sources":["ghsa","osv"]},{"ecosystem":"Bitnami","package":"envoy","fixed_in":["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":"0.15.1"}]}]},{"source":"osv","ecosystem":"Bitnami","package":"envoy","ranges":[{"type":"SEMVER","events":[{"introduced":"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":"0.15.1"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/pomerium/pomerium","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.15.1"}]}]}],"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","Third Party Advisory","advisory","web"]},{"url":"https://github.com/pomerium/pomerium/security/advisories/GHSA-gjcg-vrxg-xmgv","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-j374-mjrw-vvp8","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-39162","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-gjcg-vrxg-xmgv"},{"url":"https://github.com/pomerium/pomerium","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2021-39162","title":"Incorrect handling of H2 GOAWAY + SETTINGS frames","description":"Pomerium is an open source identity-aware access proxy. Envoy, which Pomerium is based on, can abnormally terminate if an H/2 GOAWAY and SETTINGS frame are received in the same IO event. This can lead to a DoS in the presence of untrusted *upstream* servers. 0.15.1 contains an upgraded envoy binary with this vulnerability patched. If only trusted upstreams are configured, there is not substantial risk of this condition being triggered.","status":"published","published":"2021-09-09T22:05:11Z","modified":"2024-08-04T01:58:18.235Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-754"],"updated_at":"2026-11-02T14:33:09.540052Z"}],"euvd":[{"id":"EUVD-2021-2061","description":"Pomerium is an open source identity-aware access proxy. Envoy, which Pomerium is based on, can abnormally terminate if an H/2 GOAWAY and SETTINGS frame are received in the same IO event. This can lead to a DoS in the presence of untrusted *upstream* servers. 0.15.1 contains an upgraded envoy binary with this vulnerability patched. If only trusted upstreams are configured, there is not substantial risk of this condition being triggered.","status":"published","published":"2021-09-09T22:05:11Z","modified":"2024-08-04T01:58:18Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-03T03:24:24.305495Z"}],"ghsa":[{"id":"GHSA-gjcg-vrxg-xmgv","title":"Incorrect handling of H2 GOAWAY + SETTINGS frames","description":"Envoy, which Pomerium is based on, can abnormally terminate if an H/2 GOAWAY and SETTINGS frame are received in the same IO event.  \n\n### Impact\nThis can lead to a DoS in the presence of untrusted *upstream* servers.\n\n### Patches\n0.15.1 contains an upgraded envoy binary with this vulnerability patched.\n\n### Workarounds\nIf only trusted upstreams are configured, there is not substantial risk of this condition being triggered.\n\n### References\n[envoy GSA](https://github.com/envoyproxy/envoy/security/advisories/GHSA-j374-mjrw-vvp8)\n[envoy CVE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-32780)\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\n","status":"published","published":"2021-09-10T17:54:01Z","modified":"2023-02-01T05:06:25Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-754"],"updated_at":"2026-11-02T14:36:39.086869Z"}],"nvd":[{"id":"CVE-2021-39162","description":"Pomerium is an open source identity-aware access proxy. Envoy, which Pomerium is based on, can abnormally terminate if an H/2 GOAWAY and SETTINGS frame are received in the same IO event. This can lead to a DoS in the presence of untrusted *upstream* servers. 0.15.1 contains an upgraded envoy binary with this vulnerability patched. If only trusted upstreams are configured, there is not substantial risk of this condition being triggered.","status":"published","published":"2021-09-09T22:15:09.05Z","modified":"2026-06-17T04:03:13.447Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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-754"],"updated_at":"2026-11-02T14:06:58.502206Z"}],"osv":[{"id":"CVE-2021-39162","description":"Pomerium is an open source identity-aware access proxy. Envoy, which Pomerium is based on, can abnormally terminate if an H/2 GOAWAY and SETTINGS frame are received in the same IO event. This can lead to a DoS in the presence of untrusted *upstream* servers. 0.15.1 contains an upgraded envoy binary with this vulnerability patched. If only trusted upstreams are configured, there is not substantial risk of this condition being triggered.","status":"published","published":"2021-09-09T22:15:09.05Z","modified":"2026-10-20T10:54:53.365901469Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:20.843843Z"},{"id":"GHSA-gjcg-vrxg-xmgv","title":"Incorrect handling of H2 GOAWAY + SETTINGS frames","description":"Envoy, which Pomerium is based on, can abnormally terminate if an H/2 GOAWAY and SETTINGS frame are received in the same IO event.  \n\n### Impact\nThis can lead to a DoS in the presence of untrusted *upstream* servers.\n\n### Patches\n0.15.1 contains an upgraded envoy binary with this vulnerability patched.\n\n### Workarounds\nIf only trusted upstreams are configured, there is not substantial risk of this condition being triggered.\n\n### References\n[envoy GSA](https://github.com/envoyproxy/envoy/security/advisories/GHSA-j374-mjrw-vvp8)\n[envoy CVE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-32780)\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\n","status":"published","published":"2021-09-10T17:54:01Z","modified":"2026-02-04T02:55:29.909324Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-754"],"updated_at":"2026-11-02T15:46:47.822182Z"},{"id":"BIT-envoy-2021-39162","title":"Incorrect handling of H2 GOAWAY + SETTINGS frames","description":"Pomerium is an open source identity-aware access proxy. Envoy, which Pomerium is based on, can abnormally terminate if an H/2 GOAWAY and SETTINGS frame are received in the same IO event. This can lead to a DoS in the presence of untrusted *upstream* servers. 0.15.1 contains an upgraded envoy binary with this vulnerability patched. If only trusted upstreams are configured, there is not substantial risk of this condition being triggered.","status":"published","published":"2024-03-06T10:57:33.498Z","modified":"2026-09-08T08:47:23.763744442Z","updated_at":"2026-11-02T15:28:29.563843Z"},{"id":"GO-2022-0933","title":"Incorrect handling of H2 GOAWAY + SETTINGS frames in github.com/pomerium/pomerium","description":"Incorrect handling of H2 GOAWAY + SETTINGS frames in github.com/pomerium/pomerium","status":"published","published":"2024-08-21T16:03:21Z","modified":"2026-03-03T04:52:30.897573Z","updated_at":"2026-11-02T15:47:00.918515Z"}]}}