CVE-2021-36213

Name: CVE-2021-36213
Creator: NVD / NIST
Published: 2021-07-17T18:15:07.82+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.74%

Last modified Jun 17, 2026

CVE-2021-36213 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. HashiCorp Consul and Consul Enterprise 1.9.0 through 1.10.0 default deny policy with a single L7 application-aware intention deny action cancels out, causing the intention to incorrectly fail open, allowing L4 traffic. Fixed in 1.9.8 and 1.10.1.. EPSS estimates a 1.74% chance of exploitation in the next 30 days.

Description

HashiCorp Consul and Consul Enterprise 1.9.0 through 1.10.0 default deny policy with a single L7 application-aware intention deny action cancels out, causing the intention to incorrectly fail open, allowing L4 traffic. Fixed in 1.9.8 and 1.10.1.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.74%

74.8th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Hashicorp	Consul	>= 1.9.0, < 1.9.8
Hashicorp	Consul	>= 1.10.0, < 1.10.1

References

https://discuss.hashicorp.com/t/hcsec-2021-16-consul-s-application-aware-intentions-deny-action-fails-open-when-combined-with-default-deny-policy/26855Vendor Advisory
https://github.com/hashicorp/consul/releases/tag/v1.10.1Release Notes, Third Party Advisory
https://security.gentoo.org/glsa/202208-09Third Party Advisory
https://www.hashicorp.com/blog/category/consulProduct, Vendor Advisory
https://discuss.hashicorp.com/t/hcsec-2021-16-consul-s-application-aware-intentions-deny-action-fails-open-when-combined-with-default-deny-policy/26855Vendor Advisory
https://github.com/hashicorp/consul/releases/tag/v1.10.1Release Notes, Third Party Advisory
https://security.gentoo.org/glsa/202208-09Third Party Advisory
https://www.hashicorp.com/blog/category/consulProduct, Vendor Advisory

Timeline

Published: Jul 17, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-36213?

How severe is CVE-2021-36213?

CVE-2021-36213 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.74% probability of exploitation in the next 30 days.

How do I fix CVE-2021-36213?

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-2021-36213?

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

Scan your code now

Source: NVD / NIST