High severity · published Jan 10, 2026
CVE-2025-52435
Apache Mynewt NimBLE: Invalid error handling in pause encryption procedure in NimBLE controller
7.5
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 15% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AM
Apache Mynewt NimBLE · Apache Software Foundation
through 1.8.0 · source: vendor
NI
Nimble · Apache
before 1.9.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-52435
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-52435
Patch
https://github.com/apache/mynewt-nimble/commit/164f1c23c18a290908df76ed83fe848bfe4a4903
Patch
https://github.com/apache/mynewt-nimble/commit/ec3d75e909fa6dcadf1836fefc4432794a673d18
Mailing List
https://lists.apache.org/thread/ow8dzpsqfh9llfclh5fzh6z237brzc0s
Mailing List
http://www.openwall.com/lists/oss-security/2026/01/08/1
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