CVE-2022-21655

Name: CVE-2022-21655
Creator: NVD / NIST
Published: 2022-02-22T23:15:11.163+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.13%

Last modified Jun 17, 2026

CVE-2022-21655 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Envoy is an open source edge and service proxy, designed for cloud-native applications. The envoy common router will segfault if an internal redirect selects a route configured with direct response or redirect actions. EPSS estimates a 1.13% chance of exploitation in the next 30 days.

Description

Envoy is an open source edge and service proxy, designed for cloud-native applications. The envoy common router will segfault if an internal redirect selects a route configured with direct response or redirect actions. This will result in a denial of service. As a workaround turn off internal redirects if direct response entries are configured on the same listener.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.13%

62.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-670

Affected Software

Vendor	Product	Versions
Envoyproxy	Envoy	< 1.18.6
Envoyproxy	Envoy	>= 1.19.0, < 1.19.3
Envoyproxy	Envoy	>= 1.20.0, < 1.20.2
Envoyproxy	Envoy	>= 1.21.0, < 1.21.1

References

https://github.com/envoyproxy/envoy/commit/177d608155ba8b11598b9bbf8240e90d8c350682Patch, Third Party Advisory
https://github.com/envoyproxy/envoy/security/advisories/GHSA-7r5p-7fmh-jxpgIssue Tracking, Third Party Advisory
https://github.com/envoyproxy/envoy/commit/177d608155ba8b11598b9bbf8240e90d8c350682Patch, Third Party Advisory
https://github.com/envoyproxy/envoy/security/advisories/GHSA-7r5p-7fmh-jxpgIssue Tracking, Third Party Advisory

Timeline

Published: Feb 22, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-21655?

How severe is CVE-2022-21655?

CVE-2022-21655 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.13% probability of exploitation in the next 30 days.

How do I fix CVE-2022-21655?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-21655?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST