What’s Vulnerable › Vulnerabilities
CVE-2024-28836
- Severity: medium (CVSS 5.4 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2024-04-03 · updated 2026-06-17
- Weakness: CWE-835
Description
An issue was discovered in Mbed TLS 3.5.x before 3.6.0. When negotiating the TLS version on the server side, it can fall back to the TLS 1.2 implementation of the protocol if it is disabled. If the TLS 1.2 implementation was disabled at build time, a TLS 1.2 client could put a TLS 1.3-only server into an infinite loop processing a TLS 1.2 ClientHello, resulting in a denial of service. If the TLS 1.2 implementation was disabled at runtime, a TLS 1.2 client can successfully establish a TLS 1.2 connection with the server.
Affected products
- TrustedFirmware Mbed TLS: from 3.5.0 before 3.6.0 — fixed in 3.6.0
How to fix
Upgrade to a fixed version: TrustedFirmware Mbed TLS 3.6.0. Check the vendor advisory for mitigations.
References
- https://github.com/Mbed-TLS/mbedtls/releases/tag/v3.6.0
- https://mbed-tls.readthedocs.io/en/latest/tech-updates/security-advisories/
- https://github.com/Mbed-TLS/mbedtls/releases/tag/v3.6.0
- https://mbed-tls.readthedocs.io/en/latest/tech-updates/security-advisories/
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