CVE-2024-23656: Dex 2.37.0 is discarding TLSconfig and always serves deprecated TLS 1.0/1.1 and insecure ciphers
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.
Classification
CVE ID: CVE-2024-23656
CVSS Base Severity: HIGH
CVSS Base Score: 7.5
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Problem Types
CWE-326: Inadequate Encryption Strength CWE-757: Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')Affected Products
Vendor: dexidp
Product: dex
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.13% (probability of being exploited)
EPSS Percentile: 34.36% (scored less or equal to compared to others)
EPSS Date: 2025-06-06 (when was this score calculated)
Stakeholder-Specific Vulnerability Categorization (SSVC)
SSVC Exploitation: poc
SSVC Technical Impact: partial
SSVC Automatable: true
References
https://nvd.nist.gov/vuln/detail/CVE-2024-23656https://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