CVE-2025-67445
Published: 24 February 2026
Summary
CVE-2025-67445 is a high-severity Uncontrolled Resource Consumption (CWE-400) vulnerability in Totolink X5000R Firmware. Its CVSS base score is 7.5 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Application or System Exploitation (T1499.004); ranked at the 42.1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Threat & Defense at a Glance
Threat & Defense Details
Likely Mitigating ControlsAI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Limiting concurrent sessions directly prevents uncontrolled resource consumption by capping the number of active sessions per user or account.
Analysis identifies uncontrolled resource consumption indicative of denial-of-service or abuse attempts.
Contingency plan testing includes resource exhaustion scenarios to verify recovery, making it harder for attackers to sustain exploits that cause uncontrolled consumption.
Updated contingency plans include current procedures to detect, contain, and recover from resource exhaustion, limiting an attacker's ability to sustain impact from uncontrolled consumption.
Alternate site allows resumption of operations if resource exhaustion at the primary site is exploited to cause unavailability.
Alternate telecommunications services enable resumption of essential functions when primary services become unavailable due to uncontrolled resource consumption.
The team can analyze and respond to resource exhaustion incidents, reducing the impact of attacks that exploit uncontrolled consumption weaknesses.
Timely maintenance support and spare parts enable rapid recovery from failures induced by uncontrolled resource consumption, shortening the impact window of denial-of-service attacks.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Direct remote exploitation of the CGI memory allocation flaw enables application-layer DoS via crafted POST requests.
NVD 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…
more
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.
Deeper analysisAI
CVE-2025-67445 is a denial-of-service vulnerability in the TOTOLINK X5000R router firmware version V9.1.0cu.2415_B20250515. The flaw exists in the /cgi-bin/cstecgi.cgi script, which reads the CONTENT_LENGTH environment variable and allocates memory using malloc(CONTENT_LENGTH + 1) without sufficient bounds checking. When the lighttpd web server's request size limit is not enforced, this mishandling enables memory exhaustion or a segmentation fault in the management CGI.
The vulnerability can be exploited by any unauthenticated attacker with network access to the device. By crafting and sending a large POST request, the attacker triggers uncontrolled memory allocation, crashing the CGI process and rendering the web management interface unavailable. It carries a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) and maps to CWE-400 (Uncontrolled Resource Consumption).
Vendor guidance and further details, including potential patches or workarounds, are available at http://totolink.com. Additional technical analysis and a proof-of-concept are provided in the GitHub repository https://github.com/DaRkSpOoOk/CVE-2025-67445.
Details
- CWE(s)