CVE-2025-9558

Code execution via unchecked PB-ADV payload length

Published Nov 26, 2025 · Updated Nov 26, 2025

Out-of-bounds write in Zephyr RTOS 4.2 and earlier allows physically proximate attackers to corrupt memory via Bluetooth Mesh PB-ADV. In pb_adv.c, gen_prov_start trusts the packet-supplied total length and copies buf->len bytes into link.rx.buf without checking the destination capacity. The target must expose the PB-ADV provisioning bearer to a nearby unauthenticated sender; successful corruption permits arbitrary code execution or a device crash.

CVSS severity7.6
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in Zephyr RTOS 4.2 and earlier allows physically proximate attackers to corrupt memory via Bluetooth Mesh PB-ADV. In pb_adv.c, gen_prov_start trusts the packet-supplied total length and copies buf->len bytes into link.rx.buf without checking the destination capacity. The target must expose the PB-ADV provisioning bearer to a nearby unauthenticated sender; successful corruption permits arbitrary code execution or a device crash.

The record

CVE
CVE-2025-9558
Published
Nov 26, 2025
Updated
Nov 26, 2025
Vendor
Zephyr Project
Product
Zephyr RTOS
Classifications
CWE-120
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 26, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 26, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=* <=4.2

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Zephyr Project · Zephyr RTOSversion=* <=4.2

Published CVSS scores

7.6Zephyr ProjectCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

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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