Medium severity · published Oct 23, 2023
CVE-2021-26737
The Zscaler Client Connector for macOS prior to 3.6 did not sufficiently validate RPC clients
4.7
CVSS
0.1%
EPSS
No
On KEV
Description
The Zscaler Client Connector for macOS prior to 3.6 did not sufficiently validate RPC clients. A local adversary without sufficient privileges may be able to shutdown the Zscaler tunnel by exploiting a race condition.
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Local
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 1% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CC
Client Connector · Zscaler
before 3.6 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-26737
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-26737
Release Notes
https://help.zscaler.com/client-connector/client-connector-app-release-summary-2022?applicable_category=macOS&applicable_version=3.6&deployment_date=2022-01-07&id=1388686
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