CVE-2024-53406Public exploit

Bluetooth impersonation via reused session key

Published Mar 13, 2025 · Updated Mar 19, 2025

Authentication bypass in Espressif ESP-IDF 5.3.0 allows context-dependent attackers to impersonate a trusted Bluetooth device. During reconnection, the Bluetooth Link Layer encrypts LL_Start_Enc_Rsp with the prior session key instead of deriving a fresh key from the stored LTK and new SKD. Exploitation requires possession of an earlier session key, enabling decryption, packet injection, replay, and device impersonation in later connections.

CVSS severity8.8
High
EPSS probability0.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Espressif ESP-IDF 5.3.0 allows context-dependent attackers to impersonate a trusted Bluetooth device. During reconnection, the Bluetooth Link Layer encrypts LL_Start_Enc_Rsp with the prior session key instead of deriving a fresh key from the stored LTK and new SKD. Exploitation requires possession of an earlier session key, enabling decryption, packet injection, replay, and device impersonation in later connections.

The record

CVE
CVE-2024-53406
Published
Mar 13, 2025
Updated
Mar 19, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-639, T1557
Attack vector
adjacent
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 13, 2025CVE publishedPublication date reported by the CVE source.
  2. Mar 19, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
T1557Adversary-in-the-Middle

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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