# CVE-2022-43621: Auth bypass in DIR-1935

> Network-adjacent attackers can bypass authentication on D-Link DIR-1935 routers due to flawed HNAP login request handling.

- **Severity:** High 8.8 (`CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:** 29 Mar 2023
- **Updated:** 18 Feb 2025
- **Also known as:** GHSA-24q5-7fw8-5m7f

## What is CVE-2022-43621?

CVE-2022-43621 is a high-severity authentication bypass vulnerability in D-Link DIR-1935, published on 29 Mar 2023. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of D-Link DIR-1935 1.03 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of HNAP login requests. The issue results from an incorrectly implemented comparison. An attacker can leverage this vulnerability to bypass authentication on the system. Was ZDI-CAN-16152.

Weakness: CWE-697 (Incorrect Comparison)

## Which versions are affected by CVE-2022-43621?

It affects 1 product.


Products: Dlink Dir-1935 Firmware.

## How do I fix CVE-2022-43621?

No fix has been published for CVE-2022-43621 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-43621 being exploited?

There is no known exploitation of CVE-2022-43621 in the wild and no public exploit code.

## Other vulnerabilities in D-Link DIR-1935

- [CVE-2022-43620](https://insights.sbomify.com/CVE-2022-43620/): Auth bypass in DIR-1935 (high 8.8)
- [CVE-2022-43622](https://insights.sbomify.com/CVE-2022-43622/): Memory corruption in DIR-1935 (high 8.8)
- [CVE-2022-43630](https://insights.sbomify.com/CVE-2022-43630/): Memory corruption in DIR-1935 (high 8.8)
- [CVE-2022-43619](https://insights.sbomify.com/CVE-2022-43619/): Code injection in DIR-1935 (medium 6.8)
- [CVE-2022-43623](https://insights.sbomify.com/CVE-2022-43623/): Command injection in DIR-1935 (medium 6.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-43621 and fix it if it is affected.

What it is: CVE-2022-43621 is a high-severity authentication bypass vulnerability in D-Link DIR-1935, published on 29 Mar 2023. 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-2022-43621 in the wild and no public exploit code.

Affected product: D-Link DIR-1935. 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-2022-43621/ (Markdown: https://insights.sbomify.com/CVE-2022-43621/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-43621
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-43621
- OSV: https://osv.dev/vulnerability/CVE-2022-43621

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-43621/
Summaries are generated and may contain mistakes; the official description above is the record.