# CVE-2022-40843: Auth bypass in n/a

> Attackers can bypass router login to read syslog files, exposing administrator MD5 passwords and enabling account takeover.

- **Severity:** Medium 4.9 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 Nov 2022
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-25jx-22x6-2cx2

## What is CVE-2022-40843?

CVE-2022-40843 is a medium-severity authentication bypass vulnerability in n/a, published on 15 Nov 2022. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

The Tenda AC1200 V-W15Ev2 V15.11.0.10(1576) router is vulnerable to improper authorization / improper session management that allows the router login page to be bypassed. This leads to authenticated attackers having the ability to read the routers syslog.log file which contains the MD5 password of the Administrator's user account.

## Which versions are affected by CVE-2022-40843?

It affects 1 product.


Products: Tenda W15e Firmware.

## How do I fix CVE-2022-40843?

No fix has been published for CVE-2022-40843 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-40843 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-40843 exists.

Public exploit code:

- Tenda AC1200 V-W15Ev2 - Authentication Bypass (nuclei): http/cves/2022/CVE-2022-40843.yaml

## Other vulnerabilities in n/a

- [CVE-2023-27061](https://insights.sbomify.com/CVE-2023-27061/): Memory corruption in n/a (critical 9.8)
- [CVE-2023-27063](https://insights.sbomify.com/CVE-2023-27063/): Memory corruption in n/a (critical 9.8)
- [CVE-2022-42058](https://insights.sbomify.com/CVE-2022-42058/): Memory corruption in n/a (critical 9.8)
- [CVE-2024-4115](https://insights.sbomify.com/CVE-2024-4115/): Tenda W15E AddDnsForward formAddDnsForward stack-based overflow (high 8.8)
- [CVE-2024-4116](https://insights.sbomify.com/CVE-2024-4116/): Tenda W15E DelDhcpRule formDelDhcpRule stack-based overflow (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-40843 and fix it if it is affected.

What it is: CVE-2022-40843 is a medium-severity authentication bypass vulnerability in n/a, published on 15 Nov 2022. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-40843 exists.

Affected product: n/a. 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-2022-40843/ (Markdown: https://insights.sbomify.com/CVE-2022-40843/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-40843
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-40843
- OSV: https://osv.dev/vulnerability/CVE-2022-40843

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-40843/
Summaries are generated and may contain mistakes; the official description above is the record.