CVE-2019-9503

What it is

The Broadcom brcmfmac WiFi driver prior to commit a4176ec356c73a46c07c181c6d04039fafa34a9f is vulnerable to a frame validation bypass. If the brcmfmac driver receives a firmware event frame from a remote source, the is_wlc_event_frame function will cause this frame to be discarded and unprocessed. If the driver receives the firmware event frame from the host, the appropriate handler is called. This frame validation can be bypassed if the bus used is USB (for instance by a wifi dongle). This can allow firmware event frames from a remote source to be processed. In the worst case scenario, by sending specially-crafted WiFi packets, a remote, unauthenticated attacker may be able to execute arbitrary code on a vulnerable system. More typically, this vulnerability will result in denial-of-service conditions.

At a glance

Exploitability

Can be exploited from the same network segment without logging in, but needs a user to act. High risk of data exposure, data tampering, service disruption.

Exploit odds

3.3% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2020-01-16 21:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 02:43 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 3.3% in the next 30 days (EPSS).
• Severity: 7.9 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2020-01-16 21:15 UTC

Last modified

2026-06-17 02:43 UTC

Exploit probability

3.3% · EPSS, next 30 days

Weakness

CWE-20 · Improper input validation

Record status

Modified

Affected

• Broadcom Brcmfmac Driver
• Redhat Enterprise Linux 6.0
• Redhat Enterprise Linux 7.0

Attack profile CVSS 3.1 · 7.9

Attack vector

Adjacent network

Complexity

High

Privileges needed

None

User interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2019-9503.md and follow it. Check whether this project is affected by CVE-2019-9503. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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