CVE-2026-5815 D-Link DIR-645 hedwig.cgi hedwigcgi_main stack-based overflow
Remote attackers can execute arbitrary code on unsupported D-Link DIR-645 routers via a stack-based buffer overflow in the hedwig.cgi script.
- 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-2026-5815?
CVE-2026-5815 is a high-severity memory corruption vulnerability in D-Link DIR-645, published on 8 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability was detected in D-Link DIR-645 1.01/1.02/1.03. Impacted is the function hedwigcgi_main of the file /cgi-bin/hedwig.cgi. The manipulation results in stack-based buffer overflow. The attack can be launched remotely. The exploit is now public and may be used. This vulnerability only affects products that are no longer supported by the maintainer.
Which versions are affected by CVE-2026-5815?
How do I fix CVE-2026-5815?
No fix has been published for CVE-2026-5815 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-2026-5815 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5815 exists.
Sources
Also known as GHSA-84j4-8w5h-98h3.