CVE-2023-2816: Consul Envoy Extension Downsteam Proxy Configuration By Upstream Service Owner

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-06-02 · updated 2026-06-17
Weakness: CWE-266

Description

Consul and Consul Enterprise allowed any user with service:write permissions to use Envoy extensions configured via service-defaults to patch remote proxy instances that target the configured service, regardless of whether the user has permission to modify the service(s) corresponding to those modified proxies.

Affected products

HashiCorp Consul: from 1.15.0 before 1.15.3 — fixed in 1.15.3

How to fix

Upgrade to a fixed version: HashiCorp Consul 1.15.3. Check the vendor advisory for mitigations.

References

https://discuss.hashicorp.com/t/hcsec-2023-16-consul-envoy-extension-downstream-proxy-configuration-by-upstream-service-owner/54525
https://discuss.hashicorp.com/t/hcsec-2023-16-consul-envoy-extension-downstream-proxy-configuration-by-upstream-service-owner/54525

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