CVE-2021-32778
Vulnerability from cvelistv5
Published
2021-08-24 20:30
Modified
2024-08-03 23:33
Severity ?
EPSS score ?
Summary
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
▼ | URL | Tags | |
---|---|---|---|
security-advisories@github.com | https://github.com/envoyproxy/envoy/security/advisories/GHSA-3xh3-33v5-chcc | Third Party Advisory | |
security-advisories@github.com | https://www.envoyproxy.io/docs/envoy/v1.19.0/version_history/version_history | Release Notes, Vendor Advisory | |
af854a3a-2127-422b-91ae-364da2661108 | https://github.com/envoyproxy/envoy/security/advisories/GHSA-3xh3-33v5-chcc | Third Party Advisory | |
af854a3a-2127-422b-91ae-364da2661108 | https://www.envoyproxy.io/docs/envoy/v1.19.0/version_history/version_history | Release Notes, Vendor Advisory |
Impacted products
Vendor | Product | Version | |
---|---|---|---|
▼ | envoyproxy | envoy |
Version: >= 1.19.0, < 1.19.1 Version: >= 1.18.0, < 1.18.4 Version: >= 1.17.0, < 1.17.4 Version: >= 1.16.0, < 1.16.5 |
|
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Sightings
Author | Source | Type | Date |
---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.