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Vulnerability record · CVE-2019-18371 · published 23 October 2019

CVE-2019-18371: Xiaomi Mi WiFi R3G NGINX alias misconfiguration allows directory traversal file read

MMi · Millet Router 3g Firmware

Xiaomi Mi WiFi R3G firmware before 2.28.23-stable misconfigures an NGINX alias, allowing directory traversal to read arbitrary files. The flaw bypasses authentication, so an unauthenticated network attacker can reach sensitive files such as /etc/config/account.

7.5 CVSS 3.1 High EPSS 56% · top 1.0% CWE-22 · Path traversal
7.5CVSS 3.1 base score, v2 5.0
56%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

An issue was discovered on Xiaomi Mi WiFi R3G devices before 2.28.23-stable. There is a directory traversal vulnerability to read arbitrary files via a misconfigured NGINX alias, as demonstrated by api-third-party/download/extdisks../etc/config/account. With this vulnerability, the attacker can bypass authentication.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Automated analysis

Generated by VULONE's analysis model from the NVD record, CISA KEV and EPSS data on 19 September 2026. Confidence: high.

high priorityThe vulnerability is remotely exploitable without authentication, has a public exploit, and a high EPSS score, though it is not known to be actively exploited in the wild.

What it is

Xiaomi Mi WiFi R3G firmware before 2.28.23-stable misconfigures an NGINX alias, allowing directory traversal to read arbitrary files. The flaw bypasses authentication, so an unauthenticated network attacker can reach sensitive files such as /etc/config/account.

Impact

An attacker can read arbitrary files on the device, including configuration and account data. This exposes credentials and device configuration that can enable further compromise.

Attack surface

Reachable over the network via HTTP requests to the router's web interface, specifically the api-third-party/download/extdisks path. No authentication or user interaction is required per the CVSS vector (AV:N/AC:L/PR:N/UI:N).

Exploitation

A public proof-of-concept exploit exists in the references. The CVE is not listed in CISA KEV, but EPSS is 0.55872 (98.995th percentile), indicating high predicted exploitation activity.

What to do

  • Update Xiaomi Mi WiFi R3G firmware to 2.28.23-stable or later.
  • If patching is not possible, restrict access to the router's web interface to trusted networks only.
  • Disable remote administration and unnecessary third-party download features on the router.
  • Monitor for and block HTTP requests containing directory traversal sequences targeting the api-third-party/download/extdisks endpoint.

Detection

  • Inspect HTTP request logs for traversal patterns such as '../' in requests to api-third-party/download/extdisks.
  • Alert on access to sensitive paths like /etc/config/account via the router's web interface.
  • Monitor for anomalous outbound connections from the router that may indicate data exfiltration after file read.

This assessment is produced automatically and is not human-reviewed. Verify against the vendor advisory before acting on it.

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/UltramanGaia/Xiaomi_Mi_WiFi_R3G_Vulnerability_POC/blob/master/arbitrary_file_read_vulnerability.py ExploitThird Party Advisory
https://github.com/UltramanGaia/Xiaomi_Mi_WiFi_R3G_Vulnerability_POC/blob/master/arbitrary_file_read_vulnerability.py ExploitThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2019-18371), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.