CVE-2021-39206

Name: CVE-2021-39206
Creator: NVD / NIST
Published: 2021-09-09T23:15:13.98+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.6/10EPSS 1.41%

Last modified Jun 17, 2026

CVE-2021-39206 is a high-severity vulnerability rated 8.6/10 on the CVSS scale. Pomerium is an open source identity-aware access proxy. Envoy, which Pomerium is based on, contains two authorization related vulnerabilities CVE-2021-32777 and CVE-2021-32779. EPSS estimates a 1.41% chance of exploitation in the next 30 days.

Description

Pomerium is an open source identity-aware access proxy. Envoy, which Pomerium is based on, contains two authorization related vulnerabilities CVE-2021-32777 and CVE-2021-32779. This may lead to incorrect routing or authorization policy decisions. With specially crafted requests, incorrect authorization or routing decisions may be made by Pomerium. Pomerium v0.14.8 and v0.15.1 contain an upgraded envoy binary with these vulnerabilities patched. This issue can only be triggered when using path prefix based policy. Removing any such policies should provide mitigation.

Metrics

CVSS 3.1

8.6/10

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

EPSS Probability

1.41%

69.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-863

Affected Software

Vendor	Product	Versions
Envoyproxy	Envoy	< 1.16.5
Envoyproxy	Envoy	>= 1.17.0, < 1.17.4
Envoyproxy	Envoy	>= 1.18.0, < 1.18.4
Envoyproxy	Envoy	1.19.0
Pomerium	Pomerium	>= 0.11.0, < 0.14.8
Pomerium	Pomerium	0.15.0

References

https://github.com/envoyproxy/envoy/security/advisories/GHSA-6g4j-5vrw-2m8hThird Party Advisory
https://github.com/envoyproxy/envoy/security/advisories/GHSA-r222-74fw-jqr9Third Party Advisory
https://github.com/pomerium/pomerium/security/advisories/GHSA-cfc2-wjcm-c8fmThird Party Advisory
https://groups.google.com/g/envoy-announce/c/5xBpsEZZDfE/m/wD05NZBbAgAJNot Applicable
https://github.com/envoyproxy/envoy/security/advisories/GHSA-6g4j-5vrw-2m8hThird Party Advisory
https://github.com/envoyproxy/envoy/security/advisories/GHSA-r222-74fw-jqr9Third Party Advisory
https://github.com/pomerium/pomerium/security/advisories/GHSA-cfc2-wjcm-c8fmThird Party Advisory
https://groups.google.com/g/envoy-announce/c/5xBpsEZZDfE/m/wD05NZBbAgAJNot Applicable

Timeline

Published: Sep 9, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-39206?

How severe is CVE-2021-39206?

CVE-2021-39206 has a CVSS score of 8.6/10 (HIGH severity). The EPSS model estimates a 1.41% probability of exploitation in the next 30 days.

How do I fix CVE-2021-39206?

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-2021-39206?

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

Scan your code now

Source: NVD / NIST