CVE-2021-36371

Emissary-Ingress (formerly Ambassador API Gateway) through 1.13.9 allows attackers to bypass client certificate requirements (i.e., mTLS cert_required) on backend upstreams when more than one TLSContext is defined and at least one configuration exists that does not require client certificate authentication. The attacker must send an SNI specifying an unprotected backend and an HTTP Host header specifying a protected backend. (2.x versions are unaffected. 1.x versions are unaffected with certain configuration settings involving prune_unreachable_routes and a wildcard Host resource.)

• CWE-295

• https://github.com/emissary-ingress/emissary/issues/3340Exploit, Third Party Advisory
• https://github.com/emissary-ingress/emissary/releases/tag/v2.0.0-eaRelease Notes, Third Party Advisory
• https://github.com/emissary-ingress/emissary/issues/3340Exploit, Third Party Advisory
• https://github.com/emissary-ingress/emissary/releases/tag/v2.0.0-eaRelease Notes, Third Party Advisory

Published

Jul 9, 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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