Overview
- Description
- 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.
- Source
- security-advisories@github.com
- NVD status
- Analyzed
Risk scores
CVSS 3.1
- Type
- Primary
- Base score
- 7.5
- Impact score
- 3.6
- Exploitability score
- 3.9
- Vector string
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Severity
- HIGH
CVSS 2.0
- Type
- Primary
- Base score
- 5
- Impact score
- 2.9
- Exploitability score
- 10
- Vector string
- AV:N/AC:L/Au:N/C:N/I:N/A:P
Social media
- Hype score
- Not currently trending
Configurations
[
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "AFC3BF7F-5B28-4765-8C6F-E2437A4B425D",
"versionEndExcluding": "1.16.5",
"versionStartIncluding": "1.16.0"
},
{
"criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "83547329-1394-417F-93DB-70C1A9D173B0",
"versionEndExcluding": "1.17.4",
"versionStartIncluding": "1.17.0"
},
{
"criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "D7376E28-9915-4CA1-A5DB-40874D10E781",
"versionEndExcluding": "1.18.4",
"versionStartIncluding": "1.18.0"
},
{
"criteria": "cpe:2.3:a:envoyproxy:envoy:1.19.0:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "1968AA35-60E2-4A00-84A0-617738B55D33"
}
],
"operator": "OR"
}
]
}
]