CVE-2023-28803: medium-severity vulnerability in Zscaler Client Connector
Traffic being bypassed by ZCC by configuring synthetic IP range as local network
Published · Updated
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.9epss 0.3%
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.
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Affected products
Zscaler · Client ConnectorRelated CVEs — Zscaler Client Connector
In the same product, most dangerous first.
CVE-2024-23483HIGHLocal Privilege Escalation via lack of input validationEPSS 0.7%CVE-2026-59568CRITICALRemote Code ExecutionEPSS 0.7%CVE-2023-28800HIGHOutput encoding missing in redrurl parameterEPSS 0.5%CVE-2026-59564CRITICALAuthentication bypass between ZCC and client connector portalEPSS 0.5%CVE-2026-59565HIGHLocal and kernel denial-of-serviceEPSS 0.5%CVE-2024-23459HIGHMultiple Arbitrary Creates/Overwrites by link followingEPSS 0.5%