# CVE-2000-0916: Weak cryptography in n/a

> Remote attackers can spoof TCP connections due to insufficiently random initial sequence numbers in FreeBSD.

- **Severity:** High 7.5 (`AV:N/AC:L/Au:N/C:P/I:P/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:** 29 Nov 2000
- **Updated:** 8 Aug 2024
- **Also known as:** GHSA-4h9w-7r8x-ppq7

## What is CVE-2000-0916?

CVE-2000-0916 is a high-severity vulnerability in Freebsd Freebsd, published on 29 Nov 2000. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

FreeBSD 4.1.1 and earlier, and possibly other BSD-based OSes, uses an insufficient random number generator to generate initial TCP sequence numbers (ISN), which allows remote attackers to spoof TCP connections.

## Which versions are affected by CVE-2000-0916?

It affects 1 product.


Products: Freebsd Freebsd.

## How do I fix CVE-2000-0916?

No fix has been published for CVE-2000-0916 yet. Limit exposure of the affected software until one is available.

## Is CVE-2000-0916 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2000-0916 exists.

Public exploit code:

- Linux Kernel 2.2 - Predictable TCP Initial Sequence Number (exploitdb)

## Other vulnerabilities in Freebsd Freebsd

- [CVE-2018-17160](https://insights.sbomify.com/CVE-2018-17160/): Memory corruption in FreeBSD (critical 10.0)
- [CVE-2014-3954](https://insights.sbomify.com/CVE-2014-3954/): Memory corruption in n/a (critical 10.0)
- [CVE-2006-4304](https://insights.sbomify.com/CVE-2006-4304/): Memory corruption in n/a (critical 10.0)
- [CVE-2006-0226](https://insights.sbomify.com/CVE-2006-0226/): Integer overflow in n/a (critical 10.0)
- [CVE-2004-0002](https://insights.sbomify.com/CVE-2004-0002/): Denial of service in n/a (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2000-0916 and fix it if it is affected.

What it is: CVE-2000-0916 is a high-severity vulnerability in Freebsd Freebsd, published on 29 Nov 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-2000-0916 exists.

Affected product: Freebsd Freebsd. 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-2000-0916/ (Markdown: https://insights.sbomify.com/CVE-2000-0916/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2000-0916
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2000-0916
- OSV: https://osv.dev/vulnerability/CVE-2000-0916

---
From sbomify Insights: https://insights.sbomify.com/CVE-2000-0916/
Summaries are generated and may contain mistakes; the official description above is the record.