CVE-2021-36371 | BDVDB-2026-156621 Detail

Description#

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.)

Impact#

Weaknesses#

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Exploit#

History#

1. Version 12021-07-09Record published in the CVE List.
2. Version 22024-08-04Most recent update recorded in the CVE List.