CVE-2023-5909

HIGHNVD 7.57.5—

7.5

KEPServerEX does not properly validate certificates from clients which may allow unauthenticated users to connect.

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 22.9%
KEV: Not listed

Published

November 30, 2023

Last Modified

November 21, 2024

References (2)

ics-cert@hqhttps://www.cisa.gov/news-events/ics-advisories/icsa-23-334-03
af854a3a-2127-422b-91ae-364da2661108https://www.cisa.gov/news-events/ics-advisories/icsa-23-334-03

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 8× 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.

2026-05-27 13:40 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-24 13:04 UTCEG score recompute
2026-05-24 13:04 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2023-5909?

CVE-2023-5909 is a high vulnerability published on November 30, 2023. KEPServerEX does not properly validate certificates from clients which may allow unauthenticated users to connect.

When was CVE-2023-5909 disclosed?

CVE-2023-5909 was first published in the National Vulnerability Database on November 30, 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-2023-5909 actively exploited?

CVE-2023-5909 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 22.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2023-5909?

CVE-2023-5909 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2023-5909?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-5909, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2023-5909

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CVE-2023-5909

📅 Published

🔄 Last Modified

🔗 References (2)