# 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.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 24 Feb 2026
- **Updated:** 5 Jul 2026
- **Also known as:** GHSA-v5qr-j3c6-xxx2

## 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 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2025-67445?

It affects 1 product.


Products: 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.

## 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:

- A PoC for CVE-2025-67445  (github_poc): https://github.com/DaRkSpOoOk/CVE-2025-67445

## Other vulnerabilities in Totolink X5000r Firmware

- [CVE-2025-70327](https://insights.sbomify.com/CVE-2025-70327/): Command injection in n/a (critical 9.8)
- [CVE-2025-13184](https://insights.sbomify.com/CVE-2025-13184/): Auth bypass in X5000R's (AX1800 router) (critical 9.8)
- [CVE-2024-42737](https://insights.sbomify.com/CVE-2024-42737/): Command injection in n/a (critical 9.8)
- [CVE-2024-42745](https://insights.sbomify.com/CVE-2024-42745/): Command injection in n/a (critical 9.8)
- [CVE-2024-42748](https://insights.sbomify.com/CVE-2024-42748/): Command injection in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-67445 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2025-67445 in the wild and no public exploit code.

Affected product: Totolink X5000r Firmware. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-67445/ (Markdown: https://insights.sbomify.com/CVE-2025-67445/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-67445
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-67445
- OSV: https://osv.dev/vulnerability/CVE-2025-67445

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-67445/
Summaries are generated and may contain mistakes; the official description above is the record.