5.5

CVE-2021-26737: zscaler client_connector Origin Validation Error

CVSS: 5.5v3.1MediumModified
Published 23-10-2023Last modified 11-09-2024
Open JSON

Vulnerability summary

CVE-2021-26737 is a medium (CVSS 5.5) Origin Validation Error vulnerability in zscaler client_connector. EPSS estimates a 0.11% chance of exploitation in the next 30 days, higher than 1% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.11%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 23-10-2023
    PublishedVulnerability first disclosed.
  2. 11-09-2024
    Last modifiedVulnerability information updated.

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 metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.11%

Chance of exploitation in the next 30 days

Percentile

1%

Versus all other CVEs

30-day change

0.00 pp

From 0.11% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.11%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Zscaler1 product

1 vendor · 1 product

References

1 links