{"cve":"CVE-2023-28807","nvd":{"published":"2024-01-31T20:15:44.903","modified":"2026-06-17T05:48:48.877","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","score":7.5},"cwes":["CWE-295"],"references":["https://help.zscaler.com/zia/configuring-advanced-settings#dns-optimization","https://help.zscaler.com/zia/configuring-advanced-settings#domain-fronting","https://help.zscaler.com/zia/configuring-advanced-settings#dns-optimization","https://help.zscaler.com/zia/configuring-advanced-settings#domain-fronting"],"products":["zscaler:secure_internet_and_saas_access"],"source":"nvd","synced_at":"2026-10-19T21:44:57.175229480+00:00"},"epss":{"cve":"CVE-2023-28807","score":0.00345,"percentile":0.28074,"date":"2026-11-01"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}