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Vulnerability record · CVE-2021-36213 · published 17 July 2021

CVE-2021-36213: Hashicorp consul vulnerability

Hashicorp · Consul

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.

7.5 CVSS 3.1 High EPSS 1.7% · top 23.8%
7.5CVSS 3.1 base score, v2 5.0
1.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-36213), CISA KEV, FIRST EPSS (scores of 2026-10-03). This page is refreshed as NVD updates the record.