# CVE-2025-40979: DLL search order hijack in Wave by Grandstream Networks

> Local attackers can execute arbitrary code via DLL hijacking in Grandstream Wave on Windows 11 by placing malicious files in the temp directory.

- **Severity:** High 7.0 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 10 Sep 2025
- **Updated:** 10 Sep 2025
- **Also known as:** GHSA-x4gr-w8j3-47xm

## What is CVE-2025-40979?

CVE-2025-40979 is a high-severity vulnerability in Grandstream Networks Wave, published on 10 Sep 2025. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

DLL search order hijacking vulnerability in the wave.exe executable for Windows 11, version 1.27.8. Exploitation of this vulnerability could allow attackers with local access to execute arbitrary code by placing an arbitrary file in the 'C:\Users<user>\AppData\Local\Temp' directory, which could lead to arbitrary code execution and persistence. This vulnerability is only replicable in versions of Windows 11 and does not affect earlier versions.

Weakness: CWE-427 (Uncontrolled Search Path Element)

## Which versions are affected by CVE-2025-40979?


## How do I fix CVE-2025-40979?

No fix has been published for CVE-2025-40979 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-40979 being exploited?

There is no known exploitation of CVE-2025-40979 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-40979 and fix it if it is affected.

What it is: CVE-2025-40979 is a high-severity vulnerability in Grandstream Networks Wave, published on 10 Sep 2025. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2025-40979 in the wild and no public exploit code.

Affected product: Grandstream Networks Wave. 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-2025-40979/ (Markdown: https://insights.sbomify.com/CVE-2025-40979/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-40979
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-40979
- OSV: https://osv.dev/vulnerability/CVE-2025-40979

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-40979/
Summaries are generated and may contain mistakes; the official description above is the record.