CVE-2025-52435 Apache Mynewt NimBLE: Invalid error handling in pause encryption procedure in NimBLE controller
An attacker can eavesdrop on Bluetooth Low Energy communications due to improper handling of encryption pause procedures in Apache NimBLE.
- 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-2025-52435?
CVE-2025-52435 is a high-severity vulnerability in Apache Mynewt NimBLE, published on 10 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
J2EE Misconfiguration: Data Transmission Without Encryption vulnerability in Apache NimBLE.
Improper handling of Pause Encryption procedure on Link Layer results in a previously encrypted connection being left in un-encrypted state allowing an eavesdropper to observe the remainder of the exchange. This issue affects Apache NimBLE: through <= 1.8.0.
Users are recommended to upgrade to version 1.9.0, which fixes the issue.
Weakness: CWE-5
Which versions are affected by CVE-2025-52435?
It affects 1 product.
Products include Apache Nimble.
How do I fix CVE-2025-52435?
No fix has been published for CVE-2025-52435 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-52435 being exploited?
There is no known exploitation of CVE-2025-52435 in the wild and no public exploit code.
Other vulnerabilities in Apache Mynewt NimBLE
- CVE-2026-45813 Apache NimBLE: Incorrect data validation in BASS add/modify source operation
- CVE-2025-62235 Apache Mynewt NimBLE: Incorrect handling of SMP Security Request could lead to undesirable pairing
- CVE-2026-45811 Apache NimBLE: Buffer overflow in socket HCI transport
- CVE-2026-45815 Apache NimBLE: Remote reachable assertion in ATT Read Multiple Variable Response handler
- CVE-2026-45816 Apache NimBLE: NULL pointer dereference vulnerability in SMP LTK request
Sources
Also known as GHSA-5c5p-g26h-xx2f.