# CVE-1999-0999: Denial of service in n/a

> Remote attackers can crash Microsoft SQL Server by sending malformed TDS packets, causing a denial of service.

- **Severity:** Medium 4.3 (`AV:N/AC:M/Au:N/C:N/I:N/A:P`)
- **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 2000
- **Updated:** 1 Aug 2024
- **Also known as:** GHSA-cj38-2rjc-pv2v

## What is CVE-1999-0999?

CVE-1999-0999 is a medium-severity denial of service vulnerability in Microsoft Sql Server, published on 18 Jan 2000. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Microsoft SQL 7.0 server allows a remote attacker to cause a denial of service via a malformed TDS packet.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-1999-0999?

It affects 1 product.


Products: Microsoft Sql Server.

## How do I fix CVE-1999-0999?

No fix has been published for CVE-1999-0999 yet. Limit exposure of the affected software until one is available.

## Is CVE-1999-0999 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-1999-0999 exists.

Public exploit code:

- Microsoft SQL Server 7.0/7.0 SP1 - NULL Data Denial of Service (exploitdb)

## Other vulnerabilities in Microsoft Sql Server

- [CVE-2020-0618](https://insights.sbomify.com/CVE-2020-0618/): Microsoft SQL Server Reporting Services Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2019-1068](https://insights.sbomify.com/CVE-2019-1068/): Microsoft SQL Server Remote Code Execution (high 8.8, exploited in the wild)
- [CVE-2018-8273](https://insights.sbomify.com/CVE-2018-8273/): Memory corruption in Microsoft SQL Server (critical 9.8)
- [CVE-2008-5416](https://insights.sbomify.com/CVE-2008-5416/): Memory corruption in n/a (critical 9.0)
- [CVE-2023-21705](https://insights.sbomify.com/CVE-2023-21705/): Microsoft SQL Server Remote Code Execution Vulnerability (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-1999-0999 and fix it if it is affected.

What it is: CVE-1999-0999 is a medium-severity denial of service vulnerability in Microsoft Sql Server, published on 18 Jan 2000. 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-1999-0999 exists.

Affected product: Microsoft Sql 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-1999-0999/ (Markdown: https://insights.sbomify.com/CVE-1999-0999/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-1999-0999
- NVD: https://nvd.nist.gov/vuln/detail/CVE-1999-0999
- OSV: https://osv.dev/vulnerability/CVE-1999-0999

---
From sbomify Insights: https://insights.sbomify.com/CVE-1999-0999/
Summaries are generated and may contain mistakes; the official description above is the record.