CVE-2025-52435

Bluetooth exchange disclosure via improper pause handling

Published Jan 10, 2026 · Updated Jan 10, 2026

Data transmission without encryption in Apache NimBLE 1.8.0 and earlier allows physically proximate attackers to read Bluetooth exchanges. The controller accepts Link Layer control PDUs in invalid encryption states and sends a rejection instead of terminating the link after a paused encryption restart lacks a Long Term Key. The attacker must be within Bluetooth range and trigger the pause-and-restart sequence; the remaining connection traffic is exposed, but integrity and availability are unaffected.

CVSS severity7.5
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Data transmission without encryption in Apache NimBLE 1.8.0 and earlier allows physically proximate attackers to read Bluetooth exchanges. The controller accepts Link Layer control PDUs in invalid encryption states and sends a rejection instead of terminating the link after a paused encryption restart lacks a Long Term Key. The attacker must be within Bluetooth range and trigger the pause-and-restart sequence; the remaining connection traffic is exposed, but integrity and availability are unaffected.

The record

CVE
CVE-2025-52435
Published
Jan 10, 2026
Updated
Jan 10, 2026
Vendor
The Apache Software Foundation
Product
Apache NimBLE
Classifications
CWE-5, T1040
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=0 <=1.8.0

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache NimBLEversion=0 <=1.8.0

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-5J2EE Misconfiguration: Data Transmission Without Encryption
T1040Network Sniffing

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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