Android ZCC denial of service

published 2026-09-14 56 d ago modified 2026-09-18 51 d ago also EUVD-2026-77540

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.1%; EPSS 0.1% chance of exploitation in 30 days, percentile 2%
public exploits: 0; none known

On affected versions of Zscaler client connector, a pre-installed peer app can tear down the Zscaler tunnel, force user logout, and toggle packet capture.

Patch / fix

fixed in 1

Zscaler Client Connector Android: 4.2.0.152, ChromeOS: 4.2.0.152

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 55 d ago (2026-09-14)

Exploit prediction

0.13% chance of exploitation in the next 30 days, higher than 2% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

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

Affected products

Zscaler Client Connector

Classification

Weakness

CWE-20 Improper Input Validation

References

help.zscaler.com /zscaler-client-connector/client-connector-app-release-summary-2026

Sources

CVE List CVE-2026-59570
NVD CVE-2026-59570

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