High
Security advisory
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-39204
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 11:52 UTC · Revision 1
Source evidence
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.
osv:CVE-2021-39204
Complete source record
{
"id": "881a53ce2bcd1d1996568d9cccaa93e396e5992b8ebb4f75269622bb641b121a",
"url": "https://osv.dev/vulnerability/CVE-2021-39204",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-39204",
"summary": "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.",
"evidence": "osv:CVE-2021-39204",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2021-39204",
"aliases": [
"BIT-envoy-2021-39204",
"CVE-2021-39204",
"GHSA-5wjf-62hw-q78r"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/envoyproxy/envoy",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
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},
{
"introduced": "5c801b25cae04f06bf48248c90e87d623d7a6283"
},
{
"fixed": "0de60452be1fa329c16076916b6bfe1f672aeed4"
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{
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{
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},
{
"last_affected": "68fe53a889416fd8570506232052b06f5a531541"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
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{
"last_affected": "1.16.4"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "1.17.0"
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{
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}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "1.18.0"
},
{
"fixed": "1.18.4"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:envoyproxy:envoy:1.19.0:*:*:*:*:*:*:*",
"range": [
{
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},
{
"last_affected": "1.19.0"
}
],
"source": "CPE_STRING"
}
]
}
}
],
"versions": [
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"v1.16.3",
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"v1.18.0",
"v1.17.1",
"v1.17.0",
"v1.16.2",
"v1.16.1",
"v1.16.0",
"v1.15.0",
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"v1.13.0",
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"v1.11.0",
"v1.10.0",
"v1.9.0",
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"v1.7.0",
"v1.6.0",
"v1.5.0",
"v1.4.0",
"v1.3.0",
"v1.2.0",
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-39204.json"
}
},
{
"ranges": [
{
"repo": "https://github.com/pomerium/pomerium",
"type": "GIT",
"events": [
{
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},
{
"fixed": "d3a90a03b6b3bc0f5e821d7b544464cb28320d2f"
},
{
"introduced": "7692b2ac4966f2606e1cea376dd33a14c984d9c9"
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],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:pomerium:pomerium:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "0.14.8"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:pomerium:pomerium:0.15.0:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0.15.0"
},
{
"last_affected": "0.15.0"
}
],
"source": "CPE_STRING"
}
]
}
}
],
"versions": [
"0.15.0",
"v0.15.0",
"v0.14.7",
"v0.14.6",
"v0.14.5",
"v0.14.4",
"v0.14.3",
"v0.14.2",
"v0.14.1",
"v0.14.0",
"v0.14.0-rc2",
"v0.12.0",
"v0.11.0",
"v0.11.0-rc2",
"v0.11.0-rc1",
"v0.10.0",
"v0.10.0-rc3",
"v0.10.0-rc2",
"v0.10.0-rc1",
"v0.9.0",
"v0.8.0",
"v0.7.2",
"v0.7.1",
"v0.7.0",
"v0.6.0",
"v0.5.0",
"v0.4.0",
"v0.3.0",
"v0.2.0",
"v0.1.0",
"v0.0.5",
"v0.0.4",
"v0.0.3",
"v0.0.2",
"v0.0.1"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-39204.json"
}
}
],
"modified": "2026-10-20T10:54:53.129462595Z",
"provider": "osv",
"references": [
"https://groups.google.com/g/envoy-announce/c/5xBpsEZZDfE/m/wD05NZBbAgAJ",
"https://github.com/envoyproxy/envoy/security/advisories/GHSA-3xh3-33v5-chcc",
"https://github.com/pomerium/pomerium/security/advisories/GHSA-5wjf-62hw-q78r"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2021-39204",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 386362,
"published_at": "2021-09-09T22:15:09.773+00:00"
}