CVE-2024-30166

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.

Published: 2024-04-03 Last update: 2026-06-05 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-30166 is rated Moderate Risk (54/100): CVSS Critical severity, with low exploitation likelihood (EPSS 0.73%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2024-30166

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.35% 0.73% +0.38%
2 2026-01-06 0.48% 0.35% -0.13%
3 2025-11-21 — 0.48% —

Full EPSS history (13 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-30166

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.1 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.2 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2024-30166

OS Trackers for CVE-2024-30166

vendor priority summary link
debian unimportant CVE-2024-30166 unimportant priority: Debian including 1 source packages (mbedtls), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2024-30166
ubuntu medium CVE-2024-30166 medium priority: Ubuntu including 1 source packages (mbedtls), 10 status rows across 10 suites (bionic, focal, jammy, mantic, noble, oracular, plucky, questing, upstream, xenial): not-affected 7, ignored 2, released 1. https://ubuntu.com/security/CVE-2024-30166

Affected software / configurations for CVE-2024-30166

Vendor Product Version Raw CPE
trustedfirmware mbed_tls >= 3.3.0, < 3.6.0 cpe:2.3:a:trustedfirmware:mbed_tls:*:*:*:*:*:*:*:*

References for CVE-2024-30166

cvelogic Threat Intelligence