CVE-2026-5611 Belkin F9K1015 formCrossBandSwitch stack-based overflow
Remote attackers can trigger a stack-based buffer overflow in the Belkin F9K1015 router via the formCrossBandSwitch function, potentially leading to code execution.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-5611?
CVE-2026-5611 is a high-severity memory corruption vulnerability in Belkin F9K1015, published on 6 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability was found in Belkin F9K1015 1.00.10. This affects the function formCrossBandSwitch of the file /goform/formCrossBandSwitch. Performing a manipulation of the argument webpage results in stack-based buffer overflow. The attack can be initiated remotely. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.
Which versions are affected by CVE-2026-5611?
It affects 1 product.
Products include Belkin F9k1015 Firmware.
How do I fix CVE-2026-5611?
No fix has been published for CVE-2026-5611 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-2026-5611 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5611 exists.
Other vulnerabilities in Belkin F9K1015
- CVE-2026-5610 Belkin F9K1015 formWISP5G stack-based overflow
- CVE-2026-5612 Belkin F9K1015 formWlEncrypt stack-based overflow
- CVE-2026-5613 Belkin F9K1015 formReboot stack-based overflow
- CVE-2026-5614 Belkin F9K1015 formSetPassword stack-based overflow
- CVE-2026-5628 Belkin F9K1015 Setting formSetSystemSettings stack-based overflow
Sources
Also known as GHSA-7rxh-cwgm-8354.