Linux ZCC allows unsigned updates, allowing elevated Code Execution

published 2023-10-23 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-32439

cvss: 8.2; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 21%
public exploits: 0; none known

An Improper Verification of Cryptographic Signature vulnerability in Zscaler Client Connector on Linux allows replacing binaries.This issue affects Linux Client Connector: before 1.4.0.105

Patch / fix

fixed in 2

Zscaler Client Connector 1.4.0.105
zscaler client_connector 1.4.0.105

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 2 y ago (2024-09-11)

Exploit prediction

0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	8.2	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
NVD	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/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
release-notes

Sources

CVE List CVE-2023-28804
NVD CVE-2023-28804

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