CVE-2021-39162

Name: CVE-2021-39162
Creator: NVD / NIST
Published: 2021-09-09T22:15:09.05+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.6/10EPSS 1.59%

Last modified Jun 17, 2026

CVE-2021-39162 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, can abnormally terminate if an H/2 GOAWAY and SETTINGS frame are received in the same IO event. EPSS estimates a 1.59% chance of exploitation in the next 30 days.

Description

Pomerium is an open source identity-aware access proxy. Envoy, which Pomerium is based on, can abnormally terminate if an H/2 GOAWAY and SETTINGS frame are received in the same IO event. This can lead to a DoS in the presence of untrusted *upstream* servers. 0.15.1 contains an upgraded envoy binary with this vulnerability patched. If only trusted upstreams are configured, there is not substantial risk of this condition being triggered.

Metrics

CVSS 3.1

8.6/10

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

EPSS Probability

1.59%

72.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-754

Affected Software

Vendor	Product	Versions
Envoyproxy	Envoy	< 1.18.4
Envoyproxy	Envoy	1.19.0
Pomerium	Pomerium	0.15.0

References

https://github.com/envoyproxy/envoy/security/advisories/GHSA-j374-mjrw-vvp8Third Party Advisory
https://github.com/pomerium/pomerium/security/advisories/GHSA-gjcg-vrxg-xmgvThird Party Advisory
https://groups.google.com/g/envoy-announce/c/5xBpsEZZDfE/m/wD05NZBbAgAJNot Applicable, Third Party Advisory
https://github.com/envoyproxy/envoy/security/advisories/GHSA-j374-mjrw-vvp8Third Party Advisory
https://github.com/pomerium/pomerium/security/advisories/GHSA-gjcg-vrxg-xmgvThird Party Advisory
https://groups.google.com/g/envoy-announce/c/5xBpsEZZDfE/m/wD05NZBbAgAJNot Applicable, Third Party Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-39162?

How severe is CVE-2021-39162?

CVE-2021-39162 has a CVSS score of 8.6/10 (HIGH severity). The EPSS model estimates a 1.59% probability of exploitation in the next 30 days.

How do I fix CVE-2021-39162?

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-2021-39162?

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

Scan your code now

Source: NVD / NIST