# CVE-2023-49203: Denial of service in n/a

> Remote attackers can cause denial of service via bandwidth amplification using DNSBomb manipulation in Technitium DNS server.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:** 18 Sep 2024
- **Updated:** 18 Sep 2024
- **Also known as:** GHSA-qc32-xfvc-33fg

## What is CVE-2023-49203?

CVE-2023-49203 is a high-severity denial of service vulnerability in n/a, published on 18 Sep 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Technitium 11.5.3 allows remote attackers to cause a denial of service (bandwidth amplification) because the DNSBomb manipulation causes accumulation of low-rate DNS queries such that there is a large-sized response in a burst of traffic.

Weakness: CWE-406 (Insufficient Control of Network Message Volume (Network Amplification))

## Which versions are affected by CVE-2023-49203?

It affects 1 product.


Products: Technitium Dnsserver.

## How do I fix CVE-2023-49203?

No fix has been published for CVE-2023-49203 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-49203 being exploited?

There is no known exploitation of CVE-2023-49203 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2025-50334](https://insights.sbomify.com/CVE-2025-50334/): Denial of service in n/a (high 7.5)
- [CVE-2024-56089](https://insights.sbomify.com/CVE-2024-56089/): Other in n/a (high 7.5)
- [CVE-2023-28451](https://insights.sbomify.com/CVE-2023-28451/): Denial of service in n/a (high 7.5)
- [CVE-2023-28455](https://insights.sbomify.com/CVE-2023-28455/): Denial of service in n/a (high 7.5)
- [CVE-2023-28456](https://insights.sbomify.com/CVE-2023-28456/): Denial of service in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-49203 and fix it if it is affected.

What it is: CVE-2023-49203 is a high-severity denial of service vulnerability in n/a, published on 18 Sep 2024. 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-2023-49203 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-2023-49203/ (Markdown: https://insights.sbomify.com/CVE-2023-49203/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-49203
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-49203
- OSV: https://osv.dev/vulnerability/CVE-2023-49203

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-49203/
Summaries are generated and may contain mistakes; the official description above is the record.