🛡️ CVE-2024-30166 — mbed-tls

🔴 CVSS 9.1 — Critical ✅ No Known Exploit CWE-121 NVD

9.1

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

In Mbed TLS 3.3.0 through 3.5.2 before 3.6.0, a malicious client can cause information disclosure or a denial of service because of a stack buffer over-read (of less than 256 bytes) in a TLS 1.3 server via a TLS 3.1 ClientHello.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity none, availability high.

Weakness class

CVE-2024-30166 is classified as CWE-121: Stack-based Buffer Overflow. An oversized write to a stack buffer overwrites saved state such as return addresses, which can redirect execution.

Affected software

CVE-2024-30166 is recorded against 1 package.

mbed-tls (from 3.3.0 up to 3.6.0)

Timeline and source

Published on 3 April 2024 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com
mbed-tls.readthedocs.io
github.com
mbed-tls.readthedocs.io

CVE-2024-30166 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Ubuntu

Details

Severity CRITICAL

CVSS Score 9.1

CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

CWE CWE-121

Public Exploit ✅ No

Source NVD

Published 2024-04-03

Updated 2026-08-11

Modified 2026-06-17

Fix URL N/A

Affected Packages

Software	From version	Fixed in
mbed-tls	3.3.0	3.6.0

References

Release Notes https://github.com/Mbed-TLS/mbedtls/releases/tag/v3.6.0

Vendor Advisory https://mbed-tls.readthedocs.io/en/latest/tech-updates/security-advisories/

Release Notes https://github.com/Mbed-TLS/mbedtls/releases/tag/v3.6.0

Vendor Advisory https://mbed-tls.readthedocs.io/en/latest/tech-updates/security-advisories/

🔗 NVD 🔗 Mitre

Similar Threats

Exploit Protection

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