ZIA, ZPA and connectors
CVE-2023-28807: Bypass of ZIA domain fronting detection module through evasion technique
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.
Published
ExploitedNot in CISA KEV
Ransomware useNot reportedPer CISA
SeverityMEDIUMCVSS 3.1 5.1
EPSS0.34%Chance of exploitation in 30 days
Public exploitNot tracked
FixAvailable
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| ZIA 0 | 6.2r.290 or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
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.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 13 Oct 2026.