NULL Ptr Deref in Apache NimBLE HCI handling (1.8.0)
CVE-2025-53477 Published on January 10, 2026
Apache Mynewt NimBLE: NULL Pointer Dereference in NimBLE host HCI layer
NULL Pointer Dereference vulnerability in Apache Nimble.
Missing validation of HCI connection complete or HCI command TX buffer could lead to NULL pointer dereference.
This issue requires disabled asserts and broken or bogus Bluetooth controller and thus severity is considered low.
This issue affects Apache NimBLE: through 1.8.0.
Users are recommended to upgrade to version 1.9.0, which fixes the issue.
Vulnerability Analysis
CVE-2025-53477 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Weakness Type
NULL Pointer Dereference
A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. NULL pointer dereference issues can occur through a number of flaws, including race conditions, and simple programming omissions.
Affected Versions
Apache Software Foundation Apache Mynewt NimBLE:- Before and including 1.8.0 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.