# CVE-2022-40621: WAVLINK Quantum D4G (WN531G3) Pass-The-Hash

> Attackers can capture hashed passwords via HTTP and perform pass-the-hash attacks to gain unauthorized access to WAVLINK routers.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Sep 2022
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-8mh6-982p-25hv

## What is CVE-2022-40621?

CVE-2022-40621 is a high-severity authentication bypass vulnerability in WAVLINK WN531G3, published on 13 Sep 2022. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Because the WAVLINK Quantum D4G (WN531G3) running firmware version M31G3.V5030.200325 and earlier communicates over HTTP and not HTTPS, and because the hashing mechanism does not rely on a server-supplied key, it is possible for an attacker with sufficient network access to capture the hashed password of a logged on user and use it in a classic Pass-the-Hash style attack.

Weakness: CWE-294 (Authentication Bypass by Capture-replay)

## Which versions are affected by CVE-2022-40621?

It affects 1 product.


Products: Wavlink Wn531g3 Firmware.

## How do I fix CVE-2022-40621?

No fix has been published for CVE-2022-40621 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-40621 being exploited?

There is no known exploitation of CVE-2022-40621 in the wild and no public exploit code.

## Other vulnerabilities in WAVLINK WN531G3

- [CVE-2022-40622](https://insights.sbomify.com/CVE-2022-40622/): WAVLINK Quantum D4G (WN531G3) Session Management by IP Address (high 8.8)
- [CVE-2022-40623](https://insights.sbomify.com/CVE-2022-40623/): WAVLINK Quantum D4G (WN531G3) CSRF (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-40621 and fix it if it is affected.

What it is: CVE-2022-40621 is a high-severity authentication bypass vulnerability in WAVLINK WN531G3, published on 13 Sep 2022. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2022-40621 in the wild and no public exploit code.

Affected product: WAVLINK WN531G3. 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-2022-40621/ (Markdown: https://insights.sbomify.com/CVE-2022-40621/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-40621
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-40621
- OSV: https://osv.dev/vulnerability/CVE-2022-40621

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-40621/
Summaries are generated and may contain mistakes; the official description above is the record.