CVE-2021-32778

CVE Details

Release Date:2021-08-24

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.

See more information about CVE-2021-32778 from MITRE CVE dictionary and NIST NVD


CVSS v3.0 metrics


NOTE: The following CVSS v3.0 metrics and score provided are preliminary and subject to review.

Base Score: 7.5 Base Metrics: AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Access Vector: Network Attack Complexity: Low
Privileges Required: None User Interaction: None
Scope: Unchanged Confidentiality Impact: None
Integrity Impact: None Availability Impact: High

Errata information


PlatformErrataRelease Date
Oracle Linux version 7 (istio)ELSA-2021-95252021-11-10
Oracle Linux version 7 (istio)ELSA-2021-95262021-11-09
Oracle Linux version 7 (kubernetes)ELSA-2021-95262021-11-09
Oracle Linux version 7 (olcne)ELSA-2021-95252021-11-10
Oracle Linux version 7 (olcne)ELSA-2021-95262021-11-09
Oracle Linux version 8 (istio)ELSA-2021-95252021-11-10
Oracle Linux version 8 (istio)ELSA-2021-95462021-11-09
Oracle Linux version 8 (kubernetes)ELSA-2021-95462021-11-09
Oracle Linux version 8 (olcne)ELSA-2021-95252021-11-10
Oracle Linux version 8 (olcne)ELSA-2021-95462021-11-09



This page is generated automatically and has not been checked for errors or omissions. For clarification or corrections please contact the Oracle Linux ULN team

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