CVE-2023-28804

HIGHNVD 8.28.2—

8.2

An Improper Verification of Cryptographic Signature vulnerability in Zscaler Client Connector on Linux allows replacing binaries.This issue affects Linux Client Connector: before 1.4.0.105

CVSS v3: 8.2
EG Score: 8.2(medium)
EPSS: 9.2%
KEV: Not listed

Published

October 23, 2023

Last Modified

November 21, 2024

References (2)

cve@zscalerhttps://help.zscaler.com/client-connector/client-connector-app-release-summary-2023
af854a3a-2127-422b-91ae-364da2661108https://help.zscaler.com/client-connector/client-connector-app-release-summary-2023

Weakness Classification(1)

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

CWE-347Improper Verification of Cryptographic Signature

Data Freshness Timeline

(refreshed 12× 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.

2026-06-02 20:12 UTCepss_batch
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2026-06-01 13:51 UTCepss_batch
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2026-05-29 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
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2026-05-27 13:39 UTCepss_batch
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2026-05-26 07:17 UTCepss_batch
2026-05-24 15:22 UTCEG score recompute

Frequently asked(5)

What is CVE-2023-28804?

CVE-2023-28804 is a high vulnerability published on October 23, 2023. An Improper Verification of Cryptographic Signature vulnerability in Zscaler Client Connector on Linux allows replacing binaries.This issue affects Linux Client Connector: before 1.4.0.105

When was CVE-2023-28804 disclosed?

CVE-2023-28804 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-2023-28804 actively exploited?

CVE-2023-28804 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 9.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2023-28804?

CVE-2023-28804 has a CVSS v3 base score of 8.2 (NVD).

How do I remediate CVE-2023-28804?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-28804, 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-2023-28804

📅 Published

🔄 Last Modified

🔗 References (2)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2023-28804?

🔗 Related CVEs(same CWE)

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Published

Last Modified

References (2)

Frequently asked(5)

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