# CVE-2025-67445: TOTOLINK X5000R denial of service in cstecgi.cgi

Source: https://junglewise.ai/threats/cve-2025-67445-totolink-x5000r-denial-of-service-in-cstecgi-cgi  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-02-24. Updated: 2026-07-05  
License: CC BY 4.0 with a link back

CVE-2025-67445 · Severity: high · CVSS 7.5 · Published 2026-02-24

A vulnerability in the TOTOLINK X5000R wireless router allows an attacker to crash the device's web management interface. By sending a specially crafted, oversized web request, an attacker can exhaust the router's memory, making it impossible for administrators to manage the device via its web portal. This results in a denial-of-service condition for the management functions of the router.

Technologies: [TOTOLINK X5000r](https://junglewise.ai/threats/technologies/x5000r), [TOTOLINK X5000r Firmware](https://junglewise.ai/threats/technologies/x5000r-firmware). Vendors: [TOTOLINK](https://junglewise.ai/threats/vendors/totolink).

## Quick answers

**Is CVE-2025-67445 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-67445 being exploited in the wild.

**How severe is CVE-2025-67445?** High severity, with a CVSS score of 7.5, published 24 February 2026.

**Which products and versions are affected?** TOTOLINK X5000r Firmware 9.1.0cu.2415_B20250515.

**Is there a fix for CVE-2025-67445?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2025-67445 attacked?** It is attacked over the network or from the adjacent network, in a network appliance.

**Am I affected by CVE-2025-67445?** Check whether you run TOTOLINK X5000r or TOTOLINK X5000r Firmware at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability exists within the /cgi-bin/cstecgi.cgi component of the TOTOLINK X5000R router. The CGI handler reads the CONTENT_LENGTH environment variable from an incoming HTTP POST request and uses it to perform a memory allocation via malloc(CONTENT_LENGTH + 1) without adequate bounds checking. Because the underlying lighttpd web server configuration has the 'server.max-request-size' limit commented out, an unauthenticated attacker can provide an arbitrarily large CONTENT_LENGTH. On devices with limited physical RAM (e.g., 256MB), this leads to memory exhaustion or a segmentation fault, resulting in a crash of the management CGI and a denial-of-service for the web interface.

## Affected products

- TOTOLINK X5000R firmware 9.1.0cu.2415_B20250515

## Timeline

- 2026-02-24: disclosed
- 2026-02-24: advisory

## References

- [https://github.com/DaRkSpOoOk/CVE-2025-67445](https://github.com/DaRkSpOoOk/CVE-2025-67445)

## Related threats

- [TOTOLINK X5000R OS command injection in exportOvpn handler](https://junglewise.ai/threats/cve-2026-91853-totolink-x5000r-os-command-injection-in-exportovpn-handler)
- [TOTOLINK X5000R hardcoded root password](https://junglewise.ai/threats/cve-2026-37152-totolink-x5000r-hardcoded-root-password)
- [TOTOLINK X5000R path traversal in OpenVPN Export](https://junglewise.ai/threats/cve-2026-15204-totolink-x5000r-path-traversal-in-openvpn-export)
- [A vulnerability was determined in TOTOLINK X5000R 9.1.0cu.2089_B20211224. Affected by this issue is the function…](https://junglewise.ai/threats/cve-2025-14586-a-vulnerability-was-determined-in-totolink-x5000r-9-1-0cu-2089)
- [Unauthenticated Telnet enablement via cstecgi.cgi (auth bypass) leading to unauthenticated root login with a blank…](https://junglewise.ai/threats/cve-2025-13184-unauthenticated-telnet-enablement-via-cstecgi-cgi-auth-bypass)