CVE-2026-21367 Buffer Over-read in WLAN Firmware
A buffer over-read in Qualcomm Snapdragon WLAN firmware allows attackers to cause a transient denial of service via malformed FILS Discovery Frames.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-21367?
CVE-2026-21367 is a high-severity denial of service vulnerability in Qualcomm Ar8035 Firmware, published on 6 Apr 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
Transient DOS when processing nonstandard FILS Discovery Frames with out-of-range action sizes during initial scans.
Weakness: CWE-126
Which versions are affected by CVE-2026-21367?
It affects 150 products.
Products include Qualcomm Ar8035 Firmware, Qualcomm Cologne Firmware, Qualcomm Csr8811 Firmware, Qualcomm Fastconnect 6200 Firmware, Qualcomm Fastconnect 6700 Firmware, Qualcomm Fastconnect 6900 Firmware and 144 more.
How do I fix CVE-2026-21367?
No fix has been published for CVE-2026-21367 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-21367 being exploited?
There is no known exploitation of CVE-2026-21367 in the wild and no public exploit code.
Other vulnerabilities in Qualcomm Ar8035 Firmware
- CVE-2023-33106 Qualcomm Multiple Chipsets Use of Out-of-Range Pointer Offset
- CVE-2024-45569 Improper Validation of Array Index in WLAN Host Communication
- CVE-2024-21473 Improper Input Validation in WIN SON
- CVE-2023-28582 Buffer Copy Without Checking Size of Input in Data Modem
- CVE-2023-43552 Use After Free in WLAN Host Communication
Sources
Also known as GHSA-78j8-w6rh-444w.