# CVE-2024-40721: CHANGING Information Technology TCBServiSign Windows Version - Improper Input Validation

> Attackers can force the application to load a malicious DLL from an arbitrary path via a spoofed website, leading to code execution.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 2 Aug 2024
- **Updated:** 2 Aug 2024
- **Also known as:** GHSA-f6q3-hjwj-2j45

## What is CVE-2024-40721?

CVE-2024-40721 is a high-severity path traversal vulnerability in CHANGING Information Technology TCBServiSign Windows Version, published on 2 Aug 2024. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

The specific API in TCBServiSign Windows Version from CHANGING Information Technology does not properly validate server-side input. When a user visits a spoofed website, unauthenticated remote attackers can cause the TCBServiSign to load a DLL from an arbitrary path.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2024-40721?

It affects 1 product.


Products: Changingtec Tcb Servisign.

## How do I fix CVE-2024-40721?

No fix has been published for CVE-2024-40721 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-40721 being exploited?

There is no known exploitation of CVE-2024-40721 in the wild and no public exploit code.

## Other vulnerabilities in CHANGING Information Technology TCBServiSign Windows Version

- [CVE-2024-40720](https://insights.sbomify.com/CVE-2024-40720/): CHANGING Information Technology TCBServiSign Windows Version - Improper Input Validation (high 8.8)
- [CVE-2024-40719](https://insights.sbomify.com/CVE-2024-40719/): CHANGING Information Technology TCBServiSign Windows Version - Inadequate Encryption Strength (medium 6.5)
- [CVE-2024-40722](https://insights.sbomify.com/CVE-2024-40722/): CHANGING Information Technology TCBServiSign Windows Version - Stack-based Buffer Overflow (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-40721 and fix it if it is affected.

What it is: CVE-2024-40721 is a high-severity path traversal vulnerability in CHANGING Information Technology TCBServiSign Windows Version, published on 2 Aug 2024. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2024-40721 in the wild and no public exploit code.

Affected product: CHANGING Information Technology TCBServiSign Windows Version. 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-2024-40721/ (Markdown: https://insights.sbomify.com/CVE-2024-40721/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-40721
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-40721
- OSV: https://osv.dev/vulnerability/CVE-2024-40721

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From sbomify Insights: https://insights.sbomify.com/CVE-2024-40721/
Summaries are generated and may contain mistakes; the official description above is the record.