CVE-2021-36213

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.

• 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

Published

Jul 17, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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