{"id":"CVE-2023-28807","aliases":["EUVD-2023-32442","GHSA-p774-6cp5-x7cj"],"status":"published","title":"Bypass of ZIA domain fronting detection module through evasion technique","description":"In Zscaler Internet Access (ZIA) a mismatch between Connect Host and Client Hello's Server Name Indication (SNI) enables attackers to evade network security controls by hiding their communications within legitimate traffic.","severity":{"version":"3.1","score":5.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00345,"percentile":0.28311,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-295"],"published":"2024-01-31T19:16:59Z","modified":"2026-06-17T05:48:48Z","products":[{"vendor":"zscaler","product":"secure_internet_and_saas_access"},{"vendor":"zscaler","product":"zia"}],"references":[{"url":"https://help.zscaler.com/zia/configuring-advanced-settings#domain-fronting","tags":["x_transferred","Product"]},{"url":"https://help.zscaler.com/zia/configuring-advanced-settings#dns-optimization","tags":["x_transferred","Product"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-28807"},{"url":"https://github.com/advisories/GHSA-p774-6cp5-x7cj"}],"sources":{"cve":[{"id":"CVE-2023-28807","title":"Bypass of ZIA domain fronting detection module through evasion technique","description":"In Zscaler Internet Access (ZIA) a mismatch between Connect Host and Client Hello's Server Name Indication (SNI) enables attackers to evade network security controls by hiding their communications within legitimate traffic.","status":"published","published":"2024-01-31T19:16:59.806Z","modified":"2025-06-17T21:29:19.136Z","cvss":[{"version":"3.1","score":5.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-295"],"updated_at":"2026-11-02T14:35:32.752775Z"}],"euvd":[{"id":"EUVD-2023-32442","description":"In Zscaler Internet Access (ZIA) a mismatch between Connect Host and Client Hello's Server Name Indication (SNI) enables attackers to evade network security controls by hiding their communications within legitimate traffic.","status":"published","published":"2024-01-31T19:16:59Z","modified":"2025-06-17T21:29:19Z","cvss":[{"version":"3.1","score":5.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T20:32:20.512078Z"}],"ghsa":[{"id":"GHSA-p774-6cp5-x7cj","title":"In Zscaler Internet Access (ZIA) a mismatch between Connect Host and Client Hello's Server Name...","description":"In Zscaler Internet Access (ZIA) a mismatch between Connect Host and Client Hello's Server Name Indication (SNI) enables attackers to evade network security controls by hiding their communications within legitimate traffic.","status":"published","published":"2024-01-31T21:31:03Z","modified":"2024-01-31T21:31:12Z","cvss":[{"version":"3.1","score":5.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-295"],"updated_at":"2026-11-02T14:55:31.245778Z"}],"nvd":[{"id":"CVE-2023-28807","description":"In Zscaler Internet Access (ZIA) a mismatch between Connect Host and Client Hello's Server Name Indication (SNI) enables attackers to evade network security controls by hiding their communications within legitimate traffic.","status":"published","published":"2024-01-31T20:15:44.903Z","modified":"2026-06-17T05:48:48.877Z","cvss":[{"version":"3.1","score":5.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"primary"}],"cwes":["CWE-295"],"updated_at":"2026-11-02T14:09:04.527564Z"}]}}