CVE-2024-28755

Name: CVE-2024-28755
Creator: NVD / NIST
Published: 2024-04-03T03:15:10.14+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.40%

Last modified Jun 17, 2026

CVE-2024-28755 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. An issue was discovered in Mbed TLS 3.5.x before 3.6.0. When an SSL context was reset with the mbedtls_ssl_session_reset() API, the maximum TLS version to be negotiated was not restored to the configured one. EPSS estimates a 0.40% chance of exploitation in the next 30 days.

Description

An issue was discovered in Mbed TLS 3.5.x before 3.6.0. When an SSL context was reset with the mbedtls_ssl_session_reset() API, the maximum TLS version to be negotiated was not restored to the configured one. An attacker was able to prevent an Mbed TLS server from establishing any TLS 1.3 connection, potentially resulting in a Denial of Service or forced version downgrade from TLS 1.3 to TLS 1.2.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.40%

32.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-326

Affected Software

Vendor	Product	Versions
Trustedfirmware	Mbed Tls	>= 3.5.0, <= 3.6.0

References

https://github.com/Mbed-TLS/mbedtls/releases/tag/v3.6.0Release Notes
https://github.com/hey3eNot Applicable
https://hey3e.github.ioNot Applicable
https://mbed-tls.readthedocs.io/en/latest/tech-updates/security-advisories/Vendor Advisory
https://github.com/Mbed-TLS/mbedtls/releases/tag/v3.6.0Release Notes
https://github.com/hey3eNot Applicable
https://hey3e.github.ioNot Applicable
https://mbed-tls.readthedocs.io/en/latest/tech-updates/security-advisories/Vendor Advisory

Timeline

Published: Apr 3, 2024
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2024-28755?

How severe is CVE-2024-28755?

CVE-2024-28755 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.40% probability of exploitation in the next 30 days.

How do I fix CVE-2024-28755?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2024-28755?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST