What’s Vulnerable › Vulnerabilities

CVE-2025-53477: Apache Mynewt NimBLE: NULL Pointer Dereference in NimBLE host HCI layer

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-01-10 · updated 2026-06-17
• Weakness: CWE-476

Description

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.

Affected products

• Apache Software Foundation Apache NimBLE: before 1.9.0 — fixed in 1.9.0

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache NimBLE 1.9.0. Check the vendor advisory for mitigations.

References

• https://github.com/apache/mynewt-nimble/commit/0caf9baeb271ede85fcc5237ab87ddbf938600da
• https://github.com/apache/mynewt-nimble/commit/3160b8c4c7ff8db4e0f9badcdf7df684b151e077
• https://lists.apache.org/thread/1dxthc132hwm2tzvjblrtnschcsbw2vo
• http://www.openwall.com/lists/oss-security/2026/01/08/3

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