{"id":"CVE-2023-28803","aliases":["EUVD-2023-32438","GHSA-mwvw-6ggj-fhv5"],"status":"published","title":"Traffic being bypassed by ZCC by configuring synthetic IP range as local network","description":"An authentication bypass by spoofing of a device with a synthetic IP address is possible in Zscaler Client Connector on Windows, allowing a functionality bypass. This issue affects Client Connector: before 3.9.","severity":{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00292,"percentile":0.21999,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-290"],"published":"2023-10-23T13:32:17Z","modified":"2026-06-17T05:48:48Z","products":[{"vendor":"zscaler","product":"client connector"},{"vendor":"zscaler","product":"client_connector"}],"references":[{"url":"https://help.zscaler.com/client-connector/client-connector-app-release-summary-2023","tags":["x_transferred","Release Notes"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-28803"},{"url":"https://github.com/advisories/GHSA-mwvw-6ggj-fhv5"}],"sources":{"cve":[{"id":"CVE-2023-28803","title":"Traffic being bypassed by ZCC by configuring synthetic IP range as local network","description":"An authentication bypass by spoofing of a device with a synthetic IP address is possible in Zscaler Client Connector on Windows, allowing a functionality bypass. This issue affects Client Connector: before 3.9.\n\n","status":"published","published":"2023-10-23T13:32:17.505Z","modified":"2024-09-11T14:31:41.067Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-290"],"updated_at":"2026-11-02T14:35:32.376766Z"}],"euvd":[{"id":"EUVD-2023-32438","description":"An authentication bypass by spoofing of a device with a synthetic IP address is possible in Zscaler Client Connector on Windows, allowing a functionality bypass. This issue affects Client Connector: before 3.9.\n\n","status":"published","published":"2023-10-23T13:32:17Z","modified":"2024-09-11T14:31:41Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N","level":"medium"}],"updated_at":"2026-11-03T00:55:58.744683Z"}],"ghsa":[{"id":"GHSA-mwvw-6ggj-fhv5","title":"An authentication bypass by spoofing of a device with a synthetic IP address is possible in...","description":"An authentication bypass by spoofing of a device with a synthetic IP address is possible in Zscaler Client Connector on Windows, allowing a functionality bypass. This issue affects Client Connector: before 3.9.\n\n","status":"published","published":"2023-10-23T15:30:24Z","modified":"2024-04-04T08:53:12Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N","level":"medium"}],"cwes":["CWE-290"],"updated_at":"2026-11-02T14:57:02.541362Z"}],"nvd":[{"id":"CVE-2023-28803","description":"An authentication bypass by spoofing of a device with a synthetic IP address is possible in Zscaler Client Connector on Windows, allowing a functionality bypass. This issue affects Client Connector: before 3.9.\n\n","status":"published","published":"2023-10-23T14:15:09.627Z","modified":"2026-06-17T05:48:48.363Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-290"],"updated_at":"2026-11-02T14:08:39.058878Z"}]}}