CVE-2019-9500

Host compromise via unchecked firmware SSID length

Published Jan 16, 2020 · Updated Aug 4, 2024

Heap buffer overflow in Broadcom brcmfmac before commit 1b5e242 allows attackers to crash the host through a crafted firmware event. In brcmf_wowl_nd_results, the driver passes the event-controlled SSID_len to memcpy without limiting it to the 32-byte destination. Wake-up on Wireless LAN must be configured; a compromised FullMAC chipset reaches the path directly, while remote Wi-Fi delivery additionally requires the separate firmware-event validation bypass and yields host code execution in the worst case.

CVSS severity7.9
High
EPSS probability3.85%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in Broadcom brcmfmac before commit 1b5e242 allows attackers to crash the host through a crafted firmware event. In brcmf_wowl_nd_results, the driver passes the event-controlled SSID_len to memcpy without limiting it to the 32-byte destination. Wake-up on Wireless LAN must be configured; a compromised FullMAC chipset reaches the path directly, while remote Wi-Fi delivery additionally requires the separate firmware-event validation bypass and yields host code execution in the worst case.

The record

CVE
CVE-2019-9500
Published
Jan 16, 2020
Updated
Aug 4, 2024
Vendor
Broadcom
Product
brcmfmac
Classifications
CWE-122, CWE-787, T1203
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 16, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record 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=commit prior to 1b5e2423164b3670e8bc9174e4762d297990deff

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Broadcom · brcmfmacversion=commit prior to 1b5e2423164b3670e8bc9174e4762d297990deff

Published CVSS scores

7.9CERT/CCCVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
7.9NIST NVDAV:A/AC:M/Au:N/C:C/I:C/A:C
8.3NIST NVDCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
CWE-787Out-of-bounds Write
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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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