CVE-2025-21439 Out-of-bounds Read in Windows WLAN Host
Out-of-bounds read in Qualcomm Snapdragon WLAN driver allows memory corruption and potential code execution via IOCTL calls.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-21439?
CVE-2025-21439 is a high-severity memory corruption vulnerability in Qualcomm Fastconnect 6700 Firmware, published on 7 Apr 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Memory corruption may occur while reading board data via IOCTL call when the WLAN driver copies the content to the provided output buffer.
Weakness: CWE-787
Which versions are affected by CVE-2025-21439?
It affects 25 products.
Products include Qualcomm Fastconnect 6700 Firmware, Qualcomm Fastconnect 6900 Firmware, Qualcomm Qca6595au Firmware, Qualcomm Qcm5430 Firmware, Qualcomm Qcm6490 Firmware, Qualcomm Qcn7605 Firmware and 19 more.
How do I fix CVE-2025-21439?
No fix has been published for CVE-2025-21439 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-21439 being exploited?
There is no known exploitation of CVE-2025-21439 in the wild and no public exploit code.
Other vulnerabilities in Qualcomm Fastconnect 6700 Firmware
- CVE-2024-43047 Qualcomm Multiple Chipsets Use-After-Free
- CVE-2023-21671 Improper Input Validation in Core
- CVE-2024-21464 Buffer Copy Without Checking Size of Input in Data Network Stack & Connectivity
- CVE-2024-33047 Buffer Over-read in Display
- CVE-2024-23360 Improper Access Control in Graphics Windows
Sources
Also known as GHSA-4fr5-x8r3-mvxg.