CVE-2021-32778

Source
https://nvd.nist.gov/vuln/detail/CVE-2021-32778
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-32778.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2021-32778
Aliases
Related
  • GHSA-3xh3-33v5-chcc
Published
2021-08-24T21:15:09Z
Modified
2025-02-19T03:20:12.179222Z
Downstream
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

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.

References

Affected packages

Git / github.com/envoyproxy/envoy

Affected ranges

Type
GIT
Repo
https://github.com/envoyproxy/envoy
Events

Affected versions

v1.*

v1.16.0
v1.16.1
v1.16.2
v1.16.3
v1.16.4