# CVE-2022-42785: Wiesemann & Theis: Authentication bypass in Com-Server family

> Unauthenticated remote attackers can bypass authentication on W&T Com-Server devices by crafting a modified HTTP GET request.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/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:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 Nov 2022
- **Updated:** 1 May 2025
- **Also known as:** GHSA-pvg6-pm5h-p2q2

## What is CVE-2022-42785?

CVE-2022-42785 is a critical authentication bypass vulnerability in Wiesemann & Theis AT-Modem-Emulator, published on 10 Nov 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Multiple W&T products of the ComServer Series are prone to an authentication bypass. An unathenticated remote attacker, can log in without knowledge of the password by crafting a modified HTTP GET Request.

Weakness: CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2022-42785?

It affects 17 products.


Products: Wut At-Modem-Emulator Firmware, Wut Com-Server 20ma Firmware, Wut Com-Server \+\+ Firmware, Wut Com-Server Highspeed 100basefx Firmware, Wut Com-Server Highspeed 100baselx Firmware, Wut Com-Server Highspeed 19\" 1port Firmware, Wut Com-Server Highspeed 19\" 4port Firmware, Wut Com-Server Highspeed Compact Firmware, Wut Com-Server Highspeed Industry Firmware, Wut Com-Server Highspeed Isolated Firmware, Wut Com-Server Highspeed Lc Firmware, Wut Com-Server Highspeed Oem Firmware, Wut Com-Server Highspeed Office 1port Firmware, Wut Com-Server Highspeed Office 4port Firmware, Wut Com-Server Highspeed Poe 3x Isolated Firmware, Wut Com-Server Highspeed Poe Firmware, Wut Com-Server Highspeed Ul Firmware.

## How do I fix CVE-2022-42785?

No fix has been published for CVE-2022-42785 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-42785 being exploited?

There is no known exploitation of CVE-2022-42785 in the wild and no public exploit code.

## Other vulnerabilities in Wiesemann & Theis AT-Modem-Emulator

- [CVE-2022-42787](https://insights.sbomify.com/CVE-2022-42787/): Wiesemann & Theis: Small number space for allocating session id in Com-Server family (high 8.8)
- [CVE-2022-42786](https://insights.sbomify.com/CVE-2022-42786/): Wiesemann & Theis: XSS vulnerability in web interface of the Com-Server family (medium 5.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-42785 and fix it if it is affected.

What it is: CVE-2022-42785 is a critical authentication bypass vulnerability in Wiesemann & Theis AT-Modem-Emulator, published on 10 Nov 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2022-42785 in the wild and no public exploit code.

Affected product: Wiesemann & Theis AT-Modem-Emulator. 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-2022-42785/ (Markdown: https://insights.sbomify.com/CVE-2022-42785/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-42785
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-42785
- OSV: https://osv.dev/vulnerability/CVE-2022-42785

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From sbomify Insights: https://insights.sbomify.com/CVE-2022-42785/
Summaries are generated and may contain mistakes; the official description above is the record.