CVE-2025-44557Public exploit

Authentication bypass via failed-pairing state transition

Published Jun 27, 2025 · Updated Jul 2, 2025

Authentication bypass in Cypress PSoC4 BLE SDK 3.66 allows physically proximate attackers to enter encryption without pairing. The pairing and Link Layer state machine accepts LL_ENC_REQ after a crafted pairing_failed packet instead of returning to a safe state. BLE radio range and an active pairing exchange are required; the demonstrated result is unauthenticated entry into the encryption phase.

CVSS severity8.1
High
EPSS probability0.26%
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 Cypress PSoC4 BLE SDK 3.66 allows physically proximate attackers to enter encryption without pairing. The pairing and Link Layer state machine accepts LL_ENC_REQ after a crafted pairing_failed packet instead of returning to a safe state. BLE radio range and an active pairing exchange are required; the demonstrated result is unauthenticated entry into the encryption phase.

The record

CVE
CVE-2025-44557
Published
Jun 27, 2025
Updated
Jul 2, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-303
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 27, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 2, 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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.1CISA-ADPCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 exploitPublished

Weakness, pattern, technique

CWE-303Incorrect Implementation of Authentication Algorithm

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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