CVE-2021-26736

MEDIUMNVD 6.76.7—

6.7

Multiple vulnerabilities in the Zscaler Client Connector Installer and Uninstaller for Windows prior to 3.6 allowed execution of binaries from a low privileged path. A local adversary may be able to execute code with SYSTEM privileges.

CVSS v3: 6.7
EG Score: 6.7(medium)
EPSS: 10.3%
KEV: Not listed

Published

October 23, 2023

Last Modified

November 21, 2024

References (2)

cve@zscalerhttps://help.zscaler.com/zscaler-client-connector/client-connector-app-release-summary-2021
af854a3a-2127-422b-91ae-364da2661108https://help.zscaler.com/zscaler-client-connector/client-connector-app-release-summary-2021

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 16× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-07 15:23 UTCepss_batch
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2026-05-29 13:42 UTCepss_batch

Frequently asked(5)

What is CVE-2021-26736?

CVE-2021-26736 is a medium vulnerability published on October 23, 2023. Multiple vulnerabilities in the Zscaler Client Connector Installer and Uninstaller for Windows prior to 3.6 allowed execution of binaries from a low privileged path. A local adversary may be able to execute code with SYSTEM privileges.

When was CVE-2021-26736 disclosed?

CVE-2021-26736 was first published in the National Vulnerability Database on October 23, 2023, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-26736 actively exploited?

CVE-2021-26736 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 10.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-26736?

CVE-2021-26736 has a CVSS v3 base score of 6.7 (NVD).

How do I remediate CVE-2021-26736?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-26736, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2021-26736

📅 Published

🔄 Last Modified

🔗 References (2)

Weakness Classification(2)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-26736?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (2)

Frequently asked(5)

Related CVEs(same CWE)