CVE-2026-6563 H3C Magic B1 aspForm SetAPWifiorLedInfoById buffer overflow
Remote attackers can trigger a buffer overflow in the H3C Magic B1 router via the aspForm interface, potentially leading to code execution or service disruption.
- 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-2026-6563?
CVE-2026-6563 is a high-severity memory corruption vulnerability in H3C Magic B1, published on 19 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability has been found in H3C Magic B1 up to 100R004. The affected element is the function SetAPWifiorLedInfoById of the file /goform/aspForm. The manipulation of the argument param leads to buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Which versions are affected by CVE-2026-6563?
How do I fix CVE-2026-6563?
No fix has been published for CVE-2026-6563 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-2026-6563 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-6563 exists.
Sources
Also known as GHSA-8q43-5p52-h357.