{"id":"CVE-2024-23656","aliases":["EUVD-2024-0360","GHSA-gr79-9v6v-gc9r","GO-2024-2476"],"status":"published","title":"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.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00435,"percentile":0.38031,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-326","CWE-757"],"published":"2024-01-25T19:45:41Z","modified":"2026-10-28T02:30:56Z","fixes":[{"ecosystem":"Go","package":"github.com/dexidp/dex","fixed_in":["2.38.0","0.0.0-20240125115555-5bbdb4420254"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Go","package":"github.com/dexidp/dex","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.37.0"},{"last_affected":"2.37.0"},{"fixed":"2.38.0"}]}],"versions":["2.37.0"]},{"source":"ghsa","ecosystem":"Go","package":"github.com/dexidp/dex","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.0.0-20240125115555-5bbdb4420254"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/dexidp/dex","ranges":[{"type":"SEMVER","events":[{"introduced":"2.37.0"},{"fixed":"2.38.0"}]}],"versions":["2.37.0"]},{"source":"osv","ecosystem":"Go","package":"github.com/dexidp/dex","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.0.0-20240125115555-5bbdb4420254"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/dexidp/dex","ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}]}],"products":[{"vendor":"dexidp","product":"dex"},{"vendor":"linuxfoundation","product":"dex"},{"vendor":"teamviewer","product":"dex"}],"references":[{"url":"https://github.com/dexidp/dex/security/advisories/GHSA-gr79-9v6v-gc9r","tags":["x_refsource_CONFIRM","x_transferred","Exploit","advisory","web"]},{"url":"https://github.com/dexidp/dex/issues/2848","tags":["x_refsource_MISC","x_transferred","Issue Tracking","report","web"]},{"url":"https://github.com/dexidp/dex/pull/2964","tags":["x_refsource_MISC","x_transferred","Issue Tracking","Patch","fix","web"]},{"url":"https://github.com/dexidp/dex/commit/5bbdb4420254ba73b9c4df4775fe7bdacf233b17","tags":["x_refsource_MISC","x_transferred","Patch","fix","web"]},{"url":"https://github.com/dexidp/dex/blob/70d7a2c7c1bb2646b1a540e49616cbc39622fb83/cmd/dex/serve.go#L425","tags":["x_refsource_MISC","x_transferred","Product","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-23656","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-gr79-9v6v-gc9r"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/23xxx/CVE-2024-23656.json","tags":["advisory"]},{"url":"https://github.com/dexidp/dex","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2024-23656","title":"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.","status":"published","published":"2024-01-25T19:45:41.237Z","modified":"2025-06-03T18:20:38.271Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-326","CWE-757"],"updated_at":"2026-11-02T14:34:05.444281Z"}],"euvd":[{"id":"EUVD-2024-0360","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.","status":"published","published":"2024-01-25T19:45:41Z","modified":"2025-06-03T18:20:38Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T20:32:30.496028Z"}],"ghsa":[{"id":"GHSA-gr79-9v6v-gc9r","title":"Dex discarding TLSconfig and always serves deprecated TLS 1.0/1.1 and insecure ciphers","description":"### Summary\n\nDex 2.37.0 is serving HTTPS with insecure TLS 1.0 and TLS 1.1.\n\n\n### Details\nWhile working on https://github.com/dexidp/dex/issues/2848 and implementing configurable TLS support, I noticed my changes did not have any effect in TLS config, so I started investigating. \n\nhttps://github.com/dexidp/dex/blob/70d7a2c7c1bb2646b1a540e49616cbc39622fb83/cmd/dex/serve.go#L425 is seemingly setting TLS 1.2 as minimum version, but the whole tlsConfig is ignored after \"TLS cert reloader\" was introduced in https://github.com/dexidp/dex/pull/2964. Configured cipher suites are not respected either, as seen on the output.\n\n### PoC\nBuild Dex, generate certs with `gencert.sh`, modify `config.dev.yaml` to run on https, using generated certs.\n\n```console\nissuer: http://127.0.0.1:5556/dex\n\nstorage:\n type: sqlite3\n config:\n file: dex.db\n\nweb:\n https: 127.0.0.1:5556\n tlsCert: examples/k8s/ssl/cert.pem\n tlsKey: examples/k8s/ssl/key.pem\n\n\u003crest as default\u003e\n```\n\nRun dex `bin/dex serve config.dev.yaml`.\n\nInstall `sslyze`, easy to use SSL connection analyzer:\n\n```console\npip3 install sslyze\nsslyze 127.0.0.1:5556\n```\n\nIn Dex 2.37.0, TLS 1.0 and TLS 1.1 are enabled in addition to expected TLS 1.2 and TLS 1.3.\n```console\n * TLS 1.0 Cipher Suites:\n Attempted to connect using 80 cipher suites.\n\n The server accepted the following 6 cipher suites:\n TLS_RSA_WITH_AES_256_CBC_SHA 256 \n TLS_RSA_WITH_AES_128_CBC_SHA 128 \n TLS_RSA_WITH_3DES_EDE_CBC_SHA 168 \n TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA 256 ECDH: prime256v1 (256 bits)\n TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA 128 ECDH: prime256v1 (256 bits)\n TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA 168 ECDH: prime256v1 (256 bits)\n\n The group of cipher suites supported by the server has the following properties:\n Forward Secrecy OK - Supported\n Legacy RC4 Algorithm OK - Not Supported\n\n\n * TLS 1.1 Cipher Suites:\n Attempted to connect using 80 cipher suites.\n\n The server accepted the following 6 cipher suites:\n TLS_RSA_WITH_AES_256_CBC_SHA 256 \n TLS_RSA_WITH_AES_128_CBC_SHA 128 \n TLS_RSA_WITH_3DES_EDE_CBC_SHA 168 \n TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA 256 ECDH: prime256v1 (256 bits)\n TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA 128 ECDH: prime256v1 (256 bits)\n TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA 168 ECDH: prime256v1 (256 bits)\n\n The group of cipher suites supported by the server has the following properties:\n Forward Secrecy OK - Supported\n Legacy RC4 Algorithm OK - Not Supported\n\n\n * TLS 1.2 Cipher Suites:\n Attempted to connect using 156 cipher suites.\n\n The server accepted the following 11 cipher suites:\n TLS_RSA_WITH_AES_256_GCM_SHA384 256 \n TLS_RSA_WITH_AES_256_CBC_SHA 256 \n TLS_RSA_WITH_AES_128_GCM_SHA256 128 \n TLS_RSA_WITH_AES_128_CBC_SHA 128 \n TLS_RSA_WITH_3DES_EDE_CBC_SHA 168 \n TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256 256 ECDH: X25519 (253 bits)\n TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 256 ECDH: prime256v1 (256 bits)\n TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA 256 ECDH: prime256v1 (256 bits)\n TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 128 ECDH: prime256v1 (256 bits)\n TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA 128 ECDH: prime256v1 (256 bits)\n TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA 168 ECDH: prime256v1 (256 bits)\n\n The group of cipher suites supported by the server has the following properties:\n Forward Secrecy OK - Supported\n Legacy RC4 Algorithm OK - Not Supported\n\n\n * TLS 1.3 Cipher Suites:\n Attempted to connect using 5 cipher suites.\n\n The server accepted the following 3 cipher suites:\n TLS_CHACHA20_POLY1305_SHA256 256 ECDH: X25519 (253 bits)\n TLS_AES_256_GCM_SHA384 256 ECDH: X25519 (253 bits)\n TLS_AES_128_GCM_SHA256 128 ECDH: X25519 (253 bits)\n```\n\nIn Dex 2.36.0, TLS 1.0 and TLS 1.1 are disabled as expected.\n```console\n * TLS 1.0 Cipher Suites:\n Attempted to connect using 80 cipher suites; the server rejected all cipher suites.\n\n * TLS 1.1 Cipher Suites:\n Attempted to connect using 80 cipher suites; the server rejected all cipher suites.\n\n * TLS 1.2 Cipher Suites:\n Attempted to connect using 156 cipher suites.\n\n The server accepted the following 5 cipher suites:\n TLS_RSA_WITH_AES_256_GCM_SHA384 256 \n TLS_RSA_WITH_AES_128_GCM_SHA256 128 \n TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256 256 ECDH: X25519 (253 bits)\n TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 256 ECDH: prime256v1 (256 bits)\n TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 128 ECDH: prime256v1 (256 bits)\n\n The group of cipher suites supported by the server has the following properties:\n Forward Secrecy OK - Supported\n Legacy RC4 Algorithm OK - Not Supported\n\n\n * TLS 1.3 Cipher Suites:\n Attempted to connect using 5 cipher suites.\n\n The server accepted the following 3 cipher suites:\n TLS_CHACHA20_POLY1305_SHA256 256 ECDH: X25519 (253 bits)\n TLS_AES_256_GCM_SHA384 256 ECDH: X25519 (253 bits)\n```\n\n### Impact\nTLS 1.0 and TLS 1.1 connections can be decrypted by the attacker, and hence decrypt the traffic to Dex.","status":"published","published":"2024-01-26T01:57:31Z","modified":"2025-05-27T15:45:14Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"high"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-326"],"updated_at":"2026-11-02T14:38:44.991725Z"}],"nvd":[{"id":"CVE-2024-23656","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.","status":"published","published":"2024-01-25T20:15:41.107Z","modified":"2026-06-17T07:13:19.22Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary"}],"cwes":["CWE-326","CWE-757"],"updated_at":"2026-11-02T14:09:32.147098Z"}],"osv":[{"id":"CVE-2024-23656","title":"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.","status":"published","published":"2024-01-25T19:45:41.237Z","modified":"2026-10-28T02:30:56.714448784Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-326","CWE-757"],"updated_at":"2026-11-02T15:44:38.897406Z"},{"id":"GHSA-gr79-9v6v-gc9r","title":"Dex discarding TLSconfig and always serves deprecated TLS 1.0/1.1 and insecure ciphers","description":"### Summary\n\nDex 2.37.0 is serving HTTPS with insecure TLS 1.0 and TLS 1.1.\n\n\n### Details\nWhile working on https://github.com/dexidp/dex/issues/2848 and implementing configurable TLS support, I noticed my changes did not have any effect in TLS config, so I started investigating. \n\nhttps://github.com/dexidp/dex/blob/70d7a2c7c1bb2646b1a540e49616cbc39622fb83/cmd/dex/serve.go#L425 is seemingly setting TLS 1.2 as minimum version, but the whole tlsConfig is ignored after \"TLS cert reloader\" was introduced in https://github.com/dexidp/dex/pull/2964. Configured cipher suites are not respected either, as seen on the output.\n\n### PoC\nBuild Dex, generate certs with `gencert.sh`, modify `config.dev.yaml` to run on https, using generated certs.\n\n```console\nissuer: http://127.0.0.1:5556/dex\n\nstorage:\n type: sqlite3\n config:\n file: dex.db\n\nweb:\n https: 127.0.0.1:5556\n tlsCert: examples/k8s/ssl/cert.pem\n tlsKey: examples/k8s/ssl/key.pem\n\n\u003crest as default\u003e\n```\n\nRun dex `bin/dex serve config.dev.yaml`.\n\nInstall `sslyze`, easy to use SSL connection analyzer:\n\n```console\npip3 install sslyze\nsslyze 127.0.0.1:5556\n```\n\nIn Dex 2.37.0, TLS 1.0 and TLS 1.1 are enabled in addition to expected TLS 1.2 and TLS 1.3.\n```console\n * TLS 1.0 Cipher Suites:\n Attempted to connect using 80 cipher suites.\n\n The server accepted the following 6 cipher suites:\n TLS_RSA_WITH_AES_256_CBC_SHA 256 \n TLS_RSA_WITH_AES_128_CBC_SHA 128 \n TLS_RSA_WITH_3DES_EDE_CBC_SHA 168 \n TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA 256 ECDH: prime256v1 (256 bits)\n TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA 128 ECDH: prime256v1 (256 bits)\n TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA 168 ECDH: prime256v1 (256 bits)\n\n The group of cipher suites supported by the server has the following properties:\n Forward Secrecy OK - Supported\n Legacy RC4 Algorithm OK - Not Supported\n\n\n * TLS 1.1 Cipher Suites:\n Attempted to connect using 80 cipher suites.\n\n The server accepted the following 6 cipher suites:\n TLS_RSA_WITH_AES_256_CBC_SHA 256 \n TLS_RSA_WITH_AES_128_CBC_SHA 128 \n TLS_RSA_WITH_3DES_EDE_CBC_SHA 168 \n TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA 256 ECDH: prime256v1 (256 bits)\n TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA 128 ECDH: prime256v1 (256 bits)\n TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA 168 ECDH: prime256v1 (256 bits)\n\n The group of cipher suites supported by the server has the following properties:\n Forward Secrecy OK - Supported\n Legacy RC4 Algorithm OK - Not Supported\n\n\n * TLS 1.2 Cipher Suites:\n Attempted to connect using 156 cipher suites.\n\n The server accepted the following 11 cipher suites:\n TLS_RSA_WITH_AES_256_GCM_SHA384 256 \n TLS_RSA_WITH_AES_256_CBC_SHA 256 \n TLS_RSA_WITH_AES_128_GCM_SHA256 128 \n TLS_RSA_WITH_AES_128_CBC_SHA 128 \n TLS_RSA_WITH_3DES_EDE_CBC_SHA 168 \n TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256 256 ECDH: X25519 (253 bits)\n TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 256 ECDH: prime256v1 (256 bits)\n TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA 256 ECDH: prime256v1 (256 bits)\n TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 128 ECDH: prime256v1 (256 bits)\n TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA 128 ECDH: prime256v1 (256 bits)\n TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA 168 ECDH: prime256v1 (256 bits)\n\n The group of cipher suites supported by the server has the following properties:\n Forward Secrecy OK - Supported\n Legacy RC4 Algorithm OK - Not Supported\n\n\n * TLS 1.3 Cipher Suites:\n Attempted to connect using 5 cipher suites.\n\n The server accepted the following 3 cipher suites:\n TLS_CHACHA20_POLY1305_SHA256 256 ECDH: X25519 (253 bits)\n TLS_AES_256_GCM_SHA384 256 ECDH: X25519 (253 bits)\n TLS_AES_128_GCM_SHA256 128 ECDH: X25519 (253 bits)\n```\n\nIn Dex 2.36.0, TLS 1.0 and TLS 1.1 are disabled as expected.\n```console\n * TLS 1.0 Cipher Suites:\n Attempted to connect using 80 cipher suites; the server rejected all cipher suites.\n\n * TLS 1.1 Cipher Suites:\n Attempted to connect using 80 cipher suites; the server rejected all cipher suites.\n\n * TLS 1.2 Cipher Suites:\n Attempted to connect using 156 cipher suites.\n\n The server accepted the following 5 cipher suites:\n TLS_RSA_WITH_AES_256_GCM_SHA384 256 \n TLS_RSA_WITH_AES_128_GCM_SHA256 128 \n TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256 256 ECDH: X25519 (253 bits)\n TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 256 ECDH: prime256v1 (256 bits)\n TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 128 ECDH: prime256v1 (256 bits)\n\n The group of cipher suites supported by the server has the following properties:\n Forward Secrecy OK - Supported\n Legacy RC4 Algorithm OK - Not Supported\n\n\n * TLS 1.3 Cipher Suites:\n Attempted to connect using 5 cipher suites.\n\n The server accepted the following 3 cipher suites:\n TLS_CHACHA20_POLY1305_SHA256 256 ECDH: X25519 (253 bits)\n TLS_AES_256_GCM_SHA384 256 ECDH: X25519 (253 bits)\n```\n\n### Impact\nTLS 1.0 and TLS 1.1 connections can be decrypted by the attacker, and hence decrypt the traffic to Dex.","status":"published","published":"2024-01-26T01:57:31Z","modified":"2026-09-10T03:50:00.231186716Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"},{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-326"],"updated_at":"2026-11-02T15:46:48.191583Z"},{"id":"GO-2024-2476","title":"Dex discarding TLSconfig and always serves deprecated TLS 1.0/1.1 and insecure ciphers in github.com/dexidp/dex","description":"Dex discarding TLSconfig and always serves deprecated TLS 1.0/1.1 and insecure ciphers in github.com/dexidp/dex.\n\nNOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions.\n\n(If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.)\n\nThe additional affected modules and versions are: github.com/dexidp/dex from v2.37.0 before v2.38.0.","status":"published","published":"2024-06-28T15:28:53Z","modified":"2026-02-04T04:12:41.560459Z","updated_at":"2026-11-02T15:47:01.185262Z"}]}}