# CVE-2021-43106: Open redirect in n/a

> Attackers can manipulate the HTTP Host header to redirect users to malicious domains, facilitating phishing or further attacks.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 14 Feb 2022
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-xhj6-r3m9-cx4x

## What is CVE-2021-43106?

CVE-2021-43106 is a medium-severity vulnerability in n/a, published on 14 Feb 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

A Header Injection vulnerability exists in Compass Plus TranzWare Online FIMI Web Interface Tranzware Online (TWO) 5.3.33.3 F38 and FIMI 4.2.19.4 25.The HTTP host header can be manipulated and cause the application to behave in unexpected ways. Any changes made to the header would just cause the request to be sent to a completely different Domain/IP address. This is due to that the server implicitly trusts the Host header, and fails to validate or escape it properly. An attacker can use this input to redirect target users to a malicious domain/web page. This would result in expanding the potential to further attacks and malicious actions.

Weakness: CWE-116 (Improper Encoding or Escaping of Output)

## Which versions are affected by CVE-2021-43106?

It affects 2 products.


Products: Compassplus Tranzware Online, Compassplus Tranzware Online Financial Institution Maintenance Interface.

## How do I fix CVE-2021-43106?

No fix has been published for CVE-2021-43106 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-43106 being exploited?

There is no known exploitation of CVE-2021-43106 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-43106 and fix it if it is affected.

What it is: CVE-2021-43106 is a medium-severity vulnerability in n/a, published on 14 Feb 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-43106 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-2021-43106/ (Markdown: https://insights.sbomify.com/CVE-2021-43106/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-43106
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-43106
- OSV: https://osv.dev/vulnerability/CVE-2021-43106

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-43106/
Summaries are generated and may contain mistakes; the official description above is the record.