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CVE-2021-32778

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CVE-2021-32778

Published: Aug 24, 2021

Modified: Aug 3, 2024

PUBLISHED

CVSS v3.1

5.8

MEDIUM

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.

VendorProductVersions

envoyproxy

envoy

affected
>= 1.19.0, < 1.19.1
affected
>= 1.18.0, < 1.18.4
affected
>= 1.17.0, < 1.17.4
affected
>= 1.16.0, < 1.16.5

Weaknesses (CWE)

CWE-834

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

Low

References

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