CVE-2025-55084 Out of bound read in _nx_secure_tls_proc_clienthello_supported_versions_extension()

Medium 6.9 Published 16 Oct 2025 Updated 16 Oct 2025

An out-of-bounds read in the TLS client hello processing allows attackers to cause denial of service or disclose memory contents.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2025-55084?

CVE-2025-55084 is a medium-severity memory corruption vulnerability in Eclipse Foundation NetX Duo, published on 16 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In NetX Duo version before 6.4.4, the component of Eclipse Foundation ThreadX, there was an incorrect bound check in_nx_secure_tls_proc_clienthello_supported_versions_extension() in the extension version field.

Weakness: CWE-126

Which versions are affected by CVE-2025-55084?

It affects 1 product.

Products include Eclipse Threadx Netx Duo.

How do I fix CVE-2025-55084?

No fix has been published for CVE-2025-55084 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2025-55084 being exploited?

There is no known exploitation of CVE-2025-55084 in the wild and no public exploit code.

Sources

Also known as GHSA-m474-39rw-v8gm.