{"id":"CVE-2023-47124","aliases":["EUVD-2023-3160","GHSA-8g85-whqh-cr2f","GO-2023-2381","openSUSE-SU-2024:13506-1","openSUSE-SU-2024:14076-1"],"status":"published","title":"Denial of service whith ACME HTTPChallenge in Traefik","description":"Traefik is an open source HTTP reverse proxy and load balancer. When Traefik is configured to use the `HTTPChallenge` to generate and renew the Let's Encrypt TLS certificates, the delay authorized to solve the challenge (50 seconds) can be exploited by attackers to achieve a `slowloris attack`. This vulnerability has been patch in version 2.10.6 and 3.0.0-beta5. Users are advised to upgrade. Users unable to upgrade should replace the `HTTPChallenge` with the `TLSChallenge` or the `DNSChallenge`.","severity":{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00791,"percentile":0.5656,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-400","CWE-772"],"published":"2023-12-04T20:20:30Z","modified":"2026-10-28T02:31:02Z","fixes":[{"ecosystem":"Go","package":"github.com/traefik/traefik/v2","fixed_in":["2.10.6"],"sources":["ghsa","osv"]},{"ecosystem":"Go","package":"github.com/traefik/traefik/v3","fixed_in":["3.0.0-beta5"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Go","package":"github.com/traefik/traefik/v2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.10.6"}]}]},{"source":"ghsa","ecosystem":"Go","package":"github.com/traefik/traefik/v3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.0-beta5"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/traefik/traefik/v2","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.10.6"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/traefik/traefik/v3","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.0.0-beta5"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/traefik/traefik","ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/traefik/traefik/v2","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.10.6"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/traefik/traefik/v3","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.0.0-beta5"}]}]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"traefik","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.10.7-1.1"}]}],"bundled":6},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"traefik2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.11.5-1.1"}]}],"bundled":15}],"products":[{"vendor":"traefik","product":"traefik"}],"references":[{"url":"https://github.com/traefik/traefik/security/advisories/GHSA-8g85-whqh-cr2f","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://doc.traefik.io/traefik/https/acme/#dnschallenge","tags":["x_refsource_MISC","x_transferred","Product","web"]},{"url":"https://doc.traefik.io/traefik/https/acme/#httpchallenge","tags":["x_refsource_MISC","x_transferred","Product","web"]},{"url":"https://doc.traefik.io/traefik/https/acme/#tlschallenge","tags":["x_refsource_MISC","x_transferred","Product","web"]},{"url":"https://github.com/traefik/traefik/releases/tag/v2.10.6","tags":["x_refsource_MISC","x_transferred","Release Notes","web"]},{"url":"https://github.com/traefik/traefik/releases/tag/v3.0.0-beta5","tags":["x_refsource_MISC","x_transferred","Release Notes","web"]},{"url":"https://www.cloudflare.com/learning/ddos/ddos-attack-tools/slowloris","tags":["x_refsource_MISC","web"]},{"url":"ttps://www.cloudflare.com/learning/ddos/ddos-attack-tools/slowloris/","tags":["x_refsource_MISC","x_transferred","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-47124","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-8g85-whqh-cr2f"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/47xxx/CVE-2023-47124.json","tags":["advisory"]},{"url":"https://github.com/traefik/traefik","tags":["package"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2023-39325","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-45283","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-45284","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-47106","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-47124","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-47633","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2022-23469","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2022-41717","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2022-41724","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2022-46153","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-24534","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-29013","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-45288","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2024-24788","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2024-28869","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2023-47124","title":"Denial of service whith ACME HTTPChallenge in Traefik","description":"Traefik is an open source HTTP reverse proxy and load balancer. When Traefik is configured to use the `HTTPChallenge` to generate and renew the Let's Encrypt TLS certificates, the delay authorized to solve the challenge (50 seconds) can be exploited by attackers to achieve a `slowloris attack`. This vulnerability has been patch in version 2.10.6 and 3.0.0-beta5. Users are advised to upgrade. Users unable to upgrade should replace the `HTTPChallenge` with the `TLSChallenge` or the `DNSChallenge`.","status":"published","published":"2023-12-04T20:20:30.727Z","modified":"2024-12-18T14:12:58.629Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-772"],"updated_at":"2026-11-02T14:35:14.298866Z"}],"euvd":[{"id":"EUVD-2023-3160","description":"Traefik is an open source HTTP reverse proxy and load balancer. When Traefik is configured to use the `HTTPChallenge` to generate and renew the Let's Encrypt TLS certificates, the delay authorized to solve the challenge (50 seconds) can be exploited by attackers to achieve a `slowloris attack`. This vulnerability has been patch in version 2.10.6 and 3.0.0-beta5. Users are advised to upgrade. Users unable to upgrade should replace the `HTTPChallenge` with the `TLSChallenge` or the `DNSChallenge`.","status":"published","published":"2023-12-04T20:20:30Z","modified":"2024-12-18T14:12:58Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-03T00:04:34.500778Z"}],"ghsa":[{"id":"GHSA-8g85-whqh-cr2f","title":"Traefik vulnerable to potential DDoS via ACME HTTPChallenge","description":"## Impact\n\nThere is a potential vulnerability in Traefik managing the ACME HTTP challenge.\n\nWhen Traefik is configured to use the [HTTPChallenge](https://doc.traefik.io/traefik/https/acme/#httpchallenge) to generate and renew the Let's Encrypt TLS certificates, the delay authorized to solve the challenge (50 seconds) can be exploited by attackers ([slowloris attack](https://www.cloudflare.com/learning/ddos/ddos-attack-tools/slowloris/)).\n \n## Patches\n\n- https://github.com/traefik/traefik/releases/tag/v2.10.6\n- https://github.com/traefik/traefik/releases/tag/v3.0.0-beta5\n\n## Workarounds\n\nReplace the HTTPChallenge with the [TLSChallenge](https://doc.traefik.io/traefik/https/acme/#tlschallenge) or the [DNSChallenge](https://doc.traefik.io/traefik/https/acme/#dnschallenge).\n\n## For more information\n\nIf you have any questions or comments about this advisory, please [open an issue](https://github.com/traefik/traefik/issues).","status":"published","published":"2023-12-05T18:12:37Z","modified":"2024-11-19T16:25:35Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-400","CWE-772"],"updated_at":"2026-11-02T14:38:21.777721Z"}],"nvd":[{"id":"CVE-2023-47124","description":"Traefik is an open source HTTP reverse proxy and load balancer. When Traefik is configured to use the `HTTPChallenge` to generate and renew the Let's Encrypt TLS certificates, the delay authorized to solve the challenge (50 seconds) can be exploited by attackers to achieve a `slowloris attack`. This vulnerability has been patch in version 2.10.6 and 3.0.0-beta5. Users are advised to upgrade. Users unable to upgrade should replace the `HTTPChallenge` with the `TLSChallenge` or the `DNSChallenge`.","status":"published","published":"2023-12-04T21:15:33.85Z","modified":"2026-06-17T06:32:12.267Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"}],"cwes":["CWE-772"],"updated_at":"2026-11-02T14:08:52.544469Z"}],"osv":[{"id":"CVE-2023-47124","title":"Denial of service whith ACME HTTPChallenge in Traefik","description":"Traefik is an open source HTTP reverse proxy and load balancer. When Traefik is configured to use the `HTTPChallenge` to generate and renew the Let's Encrypt TLS certificates, the delay authorized to solve the challenge (50 seconds) can be exploited by attackers to achieve a `slowloris attack`. This vulnerability has been patch in version 2.10.6 and 3.0.0-beta5. Users are advised to upgrade. Users unable to upgrade should replace the `HTTPChallenge` with the `TLSChallenge` or the `DNSChallenge`.","status":"published","published":"2023-12-04T20:20:30.727Z","modified":"2026-10-28T02:31:02.624449826Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-772"],"updated_at":"2026-11-02T15:44:34.287121Z"},{"id":"GHSA-8g85-whqh-cr2f","title":"Traefik vulnerable to potential DDoS via ACME HTTPChallenge","description":"## Impact\n\nThere is a potential vulnerability in Traefik managing the ACME HTTP challenge.\n\nWhen Traefik is configured to use the [HTTPChallenge](https://doc.traefik.io/traefik/https/acme/#httpchallenge) to generate and renew the Let's Encrypt TLS certificates, the delay authorized to solve the challenge (50 seconds) can be exploited by attackers ([slowloris attack](https://www.cloudflare.com/learning/ddos/ddos-attack-tools/slowloris/)).\n \n## Patches\n\n- https://github.com/traefik/traefik/releases/tag/v2.10.6\n- https://github.com/traefik/traefik/releases/tag/v3.0.0-beta5\n\n## Workarounds\n\nReplace the HTTPChallenge with the [TLSChallenge](https://doc.traefik.io/traefik/https/acme/#tlschallenge) or the [DNSChallenge](https://doc.traefik.io/traefik/https/acme/#dnschallenge).\n\n## For more information\n\nIf you have any questions or comments about this advisory, please [open an issue](https://github.com/traefik/traefik/issues).","status":"published","published":"2023-12-05T18:12:37Z","modified":"2026-08-07T08:12:05.047629586Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-400","CWE-772"],"updated_at":"2026-11-02T15:46:42.437513Z"},{"id":"GO-2023-2381","title":"Traefik vulnerable to potential DDoS via ACME HTTPChallenge in github.com/traefik/traefik","description":"Traefik vulnerable to potential DDoS via ACME HTTPChallenge in github.com/traefik/traefik","status":"published","published":"2024-08-21T14:30:24Z","modified":"2026-08-07T08:12:20.828843339Z","updated_at":"2026-11-02T15:47:01.185262Z"},{"id":"openSUSE-SU-2024:13506-1","title":"traefik-2.10.7-1.1 on GA media","description":"These are all security issues fixed in the traefik-2.10.7-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T04:07:18.748781Z","updated_at":"2026-11-02T16:58:36.327643Z"},{"id":"openSUSE-SU-2024:14076-1","title":"traefik2-2.11.5-1.1 on GA media","description":"These are all security issues fixed in the traefik2-2.11.5-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-24T00:00:00Z","modified":"2026-02-04T03:57:47.885126Z","updated_at":"2026-11-02T16:58:36.662953Z"}]}}