CVE-2023-45199

CRITICALNVD 9.89.8—

9.8

Mbed TLS 3.2.x through 3.4.x before 3.5 has a Buffer Overflow that can lead to remote Code execution.

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 92.9%
KEV: Not listed

Published

October 7, 2023

Last Modified

June 5, 2026

Advisory Details (1)

Auto-updated Jun 5, 2026

No patch confirmed yet.

generic

Buffer overflow in TLS handshake parsing with ECDH — Mbed TLS documentation

https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2023-10-2/

Weakness Classification(1)

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

CWE-120Buffer Copy without Checking Size (Classic Buffer Overflow)

Data Freshness Timeline

(refreshed 15× 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.

2026-06-06 13:46 UTCepss_batch
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Frequently asked(5)

What is CVE-2023-45199?

CVE-2023-45199 is a critical vulnerability published on October 7, 2023. Mbed TLS 3.2.x through 3.4.x before 3.5 has a Buffer Overflow that can lead to remote Code execution.

When was CVE-2023-45199 disclosed?

CVE-2023-45199 was first published in the National Vulnerability Database on October 7, 2023, with the most recent update on June 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2023-45199 actively exploited?

CVE-2023-45199 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 92.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2023-45199?

CVE-2023-45199 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2023-45199?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-45199, 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-2023-45199

📅 Published

🔄 Last Modified

📋 Advisory Details (1)

Buffer overflow in TLS handshake parsing with ECDH — Mbed TLS documentation

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2023-45199?

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Advisory Details (1)

Frequently asked(5)

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