Junction Delete leading to elevation of privilege

published 2023-10-23 3 y ago modified 2026-06-17 4 mo ago also EUVD-2021-13521

cvss: 4.4; 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 4%
public exploits: 0; none known

Zscaler Client Connector Installer on Windows before version 3.4.0.124 improperly handled directory junctions during uninstallation. A local adversary may be able to delete folders in an elevated context.

Patch / fix

fixed in 1

Zscaler Client Connector 3.4.0.124

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 2 y ago (2024-09-11)

Exploit prediction

0.15% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	4.4	CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H
NVD	3.1	5.5	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Affected products

Zscaler Client Connector

Classification

Weakness

CWE-269 Improper Privilege Management

References

help.zscaler.com /zscaler-client-connector/client-connector-app-release-summary-2021
release-notes

Sources

CVE List CVE-2021-26734
NVD CVE-2021-26734

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