CVE-2023-35945

2023-07-1318:35:55

redhat.com

access.redhat.com

envoy

http/2 codec

denial of service

memory exhaustion

vulnerability

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

EPSS

0.001

Percentile

38.4%

JSON

A flaw was found in Envoy, where a specifically crafted response from an untrusted upstream service can cause a denial of service through memory exhaustion. This issue is caused by Envoy’s HTTP/2 codec, which may leak a header map and bookkeeping structures upon receiving RST_STREAM immediately, followed by the GOAWAY frames from an upstream server.