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TI-2023-13316 Aliases CVE-2023-28806GHSA-hrw8-hpf8-7q72

Signature validation error in DLL allows disabling anti-tampering protection

Priority LOW 30CWE-347Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-347.

Summary

An Improper Validation of signature in Zscaler Client Connector on Windows allows an authenticated user to disable anti-tampering. This issue affects Client Connector on Windows <4.2.0.190.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00188 8th percentileScored 2026-11-07
Fix Fixed Client Connector (Zscaler): 4.2.0.190

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

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

Affected products

VendorProductAffected versionsFixed inStatusSource
ZscalerClient Connectorbefore 4.2.0.1904.2.0.190Patch availableCNA
  • Client Connector VendorZscaler Affected before 4.2.0.190 Fixed in 4.2.0.190 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:zscaler:client_connector:*:*:*:*:*:windows:*:*before 4.2.0.190VulnerableZscaler
  • cpe:2.3:a:zscaler:client_connector:*:*:*:*:*:windows:*:* Versions before 4.2.0.190 Vulnerable ·Zscaler

Remediation

  • Fix · CNA Client Connector (Zscaler) Fixed in 4.2.0.190

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Zscaler Client Connector 4.2.0.190

    3 records Highest priority Priority LOW 3 LOW

    Other records, highest priority first

    • TI-2024-15504 Local Privilege Escalation on Zscaler Client Connector on WindowsPriority LOW 35
    • TI-2024-15502 Signature validation issue leads to Anti-Tampering bypassPriority LOW 35
    Show all 3 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-28806
  2. 2026-10-03 Alias added: GHSA-hrw8-hpf8-7q72

References

Advisory 1

  • TI-2020-09334 The Zscaler Client Connector for Windows prior to 2.1.2.74 had a stack based buffer… CVSS 3.1CRITICAL 9.8
  • TI-2024-15528 Local Privilege Escalation via lack of input validation CVSS 3.1CRITICAL 9.8
  • TI-2024-15526 Insecure MacOS code sign check fallback CVSS 3.1CRITICAL 9.8
  • TI-2024-15505 Multiple Arbitrary Creates/Overwrites by link following CVSS 3.1CRITICAL 9.8
  • TI-2023-13308 Out-of-bounds write to heap in pacparser CVSS 3.1CRITICAL 9.8
  • TI-2023-13315 ZCC on Linux privilege escalation CVSS 3.1CRITICAL 9.8
See all 40 →

Sources

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