Improper Check for Unusual or Exceptional Conditions in envoy - CVE-2021-32780
Published: August 30, 2021
Vulnerability identifier: #VU56148
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-32780
CWE-ID: CWE-754
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to incorrect handling of H/2 GOAWAY followed by SETTINGS frames. A remote attacker can cause a denial of service condition on the target system.
Affected software
envoy
Istio
Istio
How to mitigate CVE-2021-32780
Install updates from vendor's website.
envoy - addressed in versions 1.18.4, 1.19.1
Istio - addressed in versions 1.9.8, 1.10.4, 1.11.1
Istio - addressed in versions 1.9.8, 1.10.4, 1.11.1