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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2021-32778 Detail

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://github.com/envoyproxy/envoy/security/advisories/GHSA-3xh3-33v5-chcc Third Party Advisory 
https://github.com/envoyproxy/envoy/security/advisories/GHSA-3xh3-33v5-chcc Third Party Advisory 
https://www.envoyproxy.io/docs/envoy/v1.19.0/version_history/version_history Release Notes  Vendor Advisory 
https://www.envoyproxy.io/docs/envoy/v1.19.0/version_history/version_history Release Notes  Vendor Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-834 Excessive Iteration cwe source acceptance level NIST   GitHub, Inc.  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

4 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-32778
NVD Published Date:
08/24/2021
NVD Last Modified:
11/21/2024
Source:
GitHub, Inc.