# CVE-2021-4433: Karjasoft Sami HTTP Server HTTP HEAD Rrequest denial of service

> Remote attackers can cause a denial of service in Karjasoft Sami HTTP Server by sending malicious HTTP HEAD requests.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Jan 2024
- **Updated:** 23 Oct 2024
- **Also known as:** GHSA-22mf-f3cc-mh6f

## What is CVE-2021-4433?

CVE-2021-4433 is a medium-severity denial of service vulnerability in Karjasoft Sami HTTP Server, published on 18 Jan 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability was found in Karjasoft Sami HTTP Server 2.0. It has been classified as problematic. Affected is an unknown function of the component HTTP HEAD Rrequest Handler. The manipulation leads to denial of service. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. The identifier of this vulnerability is VDB-250836.

Weakness: CWE-404 (Improper Resource Shutdown or Release)

## Which versions are affected by CVE-2021-4433?

It affects 1 product.


Products: Karjasoft Sami Http Server.

## How do I fix CVE-2021-4433?

No fix has been published for CVE-2021-4433 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-4433 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-4433 exists.

## Other vulnerabilities in Karjasoft Sami HTTP Server

- [CVE-2004-0292](https://insights.sbomify.com/CVE-2004-0292/): Memory corruption in n/a (critical 10.0)
- [CVE-2007-0548](https://insights.sbomify.com/CVE-2007-0548/): Denial of service in n/a (medium 5.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-4433 and fix it if it is affected.

What it is: CVE-2021-4433 is a medium-severity denial of service vulnerability in Karjasoft Sami HTTP Server, published on 18 Jan 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-4433 exists.

Affected product: Karjasoft Sami HTTP Server. 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-2021-4433/ (Markdown: https://insights.sbomify.com/CVE-2021-4433/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-4433
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-4433
- OSV: https://osv.dev/vulnerability/CVE-2021-4433

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-4433/
Summaries are generated and may contain mistakes; the official description above is the record.