Signature validation issue leads to Anti-Tampering bypass

published 2024-08-06 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-20954

cvss: 7.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 13%
public exploits: 0; none known

Anti-tampering can be disabled under certain conditions without signature validation. This affects Zscaler Client Connector <4.2.0.190 with anti-tampering enabled.

Patch / fix

fixed in 2

Zscaler Client Connector 4.2.0.190
zscaler client_connector 4.2.0.190

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 2 y ago (2024-08-06)

Exploit prediction

0.23% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.8	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

Zscaler Client Connector
zscaler client_connector

Classification

Weakness

CWE-347 Improper Verification of Cryptographic Signature

References

help.zscaler.com /client-connector/client-connector-app-release-summary-2023?applicable_category=windows&applicable_version=4.2
vendor-advisory

Sources

CVE List CVE-2024-23456
NVD CVE-2024-23456

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary