# CVE-2021-42949: Auth bypass in n/a

> Attackers can bypass authentication in HotelDruid by brute-forcing predictable session tokens generated by the login function.

- **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:** Yes
- **Published:** 16 Sep 2022
- **Updated:** 3 Jun 2025
- **Also known as:** DEBIAN-CVE-2021-42949, GHSA-87g3-rx63-rrch, UBUNTU-CVE-2021-42949

## What is CVE-2021-42949?

CVE-2021-42949 is a critical authentication bypass vulnerability in n/a, published on 16 Sep 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The component controlla_login function in HotelDruid Hotel Management Software v3.0.3 generates a predictable session token, allowing attackers to bypass authentication via bruteforce attacks.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2021-42949?

It affects 1 product.


Products: Digitaldruid Hoteldruid.

## How do I fix CVE-2021-42949?

Apply the vendor's patch.

## Is CVE-2021-42949 being exploited?

There is no known exploitation of CVE-2021-42949 in the wild and no public exploit code.

Public exploit code:

- https://github.com/dhammon/HotelDruid-CVE-2021-42949 (github_poc): https://github.com/dhammon/HotelDruid-CVE-2021-42949

## Other vulnerabilities in n/a

- [CVE-2023-43371](https://insights.sbomify.com/CVE-2023-43371/): SQL injection in n/a (critical 9.8)
- [CVE-2023-43373](https://insights.sbomify.com/CVE-2023-43373/): SQL injection in n/a (critical 9.8)
- [CVE-2023-43374](https://insights.sbomify.com/CVE-2023-43374/): SQL injection in n/a (critical 9.8)
- [CVE-2023-43375](https://insights.sbomify.com/CVE-2023-43375/): SQL injection in n/a (critical 9.8)
- [CVE-2021-37832](https://insights.sbomify.com/CVE-2021-37832/): SQL injection in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-42949 and fix it if it is affected.

What it is: CVE-2021-42949 is a critical authentication bypass vulnerability in n/a, published on 16 Sep 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-2021-42949 in the wild and no public exploit code.

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-2021-42949/ (Markdown: https://insights.sbomify.com/CVE-2021-42949/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-42949
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-42949
- OSV: https://osv.dev/vulnerability/CVE-2021-42949

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-42949/
Summaries are generated and may contain mistakes; the official description above is the record.