TI-2023-13317 Aliases CVE-2023-28807 GHSA-p774-6cp5-x7cj

Bypass of ZIA domain fronting detection module through evasion technique

LOW 33CWE-295Published 2024-01-31 · Updated 2025-06-17

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Spoofing
Confidentiality · integrity · availability: None · High · None
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-295.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00345 28th percentileScored 2026-11-07

Fix Fixed ZIA (Zscaler): 6.2r.290

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Zscaler	ZIA	before 6.2r.290	6.2r.290	Patch available	CNA

ZIA VendorZscaler Affected before 6.2r.290 Fixed in 6.2r.290 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:zscaler:secure_internet_and_saas_access::::::::	before 6.2r.290	Vulnerable	Zscaler

cpe:2.3:a:zscaler:secure_internet_and_saas_access:*:*:*:*:*:*:*:* Versions before 6.2r.290 Vulnerable ·Zscaler

Remediation

Fix · CNA ZIA (Zscaler) Fixed in 6.2r.290

Timeline

2026-10-02 Threatist record created from CVE-2023-28807
2026-10-03 Alias added: GHSA-p774-6cp5-x7cj

References

Other 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences