CVE-2025-67445 Denial of service in n/a
A crafted large POST request can crash the management CGI on TOTOLINK X5000R routers if request size limits are not enforced, causing loss of web interface availability.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-67445?
CVE-2025-67445 is a medium-severity denial of service vulnerability in Totolink X5000r Firmware, published on 24 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
TOTOLINK X5000R V9.1.0cu.2415_B20250515 contains a denial-of-service vulnerability in /cgi-bin/cstecgi.cgi. The CGI reads the CONTENT_LENGTH environment variable and allocates memory using malloc (CONTENT_LENGTH + 1) without sufficient bounds checking. When lighttpd s request size limit is not enforced, a crafted large POST request can cause memory exhaustion or a segmentation fault, leading to a crash of the management CGI and loss of availability of the web interface.
Weakness: CWE-400
Which versions are affected by CVE-2025-67445?
It affects 1 product.
Products include Totolink X5000r Firmware.
How do I fix CVE-2025-67445?
No fix has been published for CVE-2025-67445 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-2025-67445 being exploited?
There is no known exploitation of CVE-2025-67445 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Totolink X5000r Firmware
Sources
Also known as GHSA-v5qr-j3c6-xxx2.