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Vulnerability record · CVE-2018-1143 · published 19 April 2018

CVE-2018-1143: Belkin N750 router command injection via twonky_command.cgi

Belkin · N750 Firmware

The Belkin N750 running firmware 1.10.22 fails to sanitize input to twonky_command.cgi, allowing OS command injection. A remote attacker can run arbitrary commands as root without authenticating, making this a full device compromise.

9.8 CVSS 3.0 Critical EPSS 55% · top 1.0% CWE-78 · OS command injection
9.8CVSS 3.0 base score, v2 10.0
55%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

A remote unauthenticated user can execute commands as root in the Belkin N750 using firmware version 1.10.22 by sending a crafted HTTP request to twonky_command.cgi.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Automated analysis

Generated by VULONE's analysis model from the NVD record, CISA KEV and EPSS data on 20 September 2026. Confidence: high.

critical priorityUnauthenticated remote root command execution with a CVSS of 9.8 and high EPSS probability makes this an urgent exposure for any internet-facing N750.

What it is

The Belkin N750 running firmware 1.10.22 fails to sanitize input to twonky_command.cgi, allowing OS command injection. A remote attacker can run arbitrary commands as root without authenticating, making this a full device compromise.

Impact

An attacker gains root-level command execution on the router, enabling complete control of the device, traffic interception, and use as a pivot into the local network.

Attack surface

Reachable over the network via a crafted HTTP request to twonky_command.cgi; the CVSS vector shows no privileges or user interaction required, so it is unauthenticated and remotely triggerable.

Exploitation

Not listed in CISA KEV, but EPSS is 0.547 (98.9th percentile) and both references are tagged Exploit, indicating public exploit material exists.

What to do

  • Apply the vendor firmware fix for the N750 if Belkin has released one; if no patch exists, retire or replace the device.
  • Block external access to the router's web management interface and twonky_command.cgi at the network perimeter.
  • Isolate the router on a segmented network so a compromise cannot reach other internal hosts.
  • Disable the Twonky media service if it is not required.
  • Monitor Belkin advisories for a fixed firmware version and upgrade as soon as available.

Detection

  • Inspect HTTP request logs for POST or GET requests to twonky_command.cgi, especially with shell metacharacters in parameters.
  • Alert on unexpected outbound connections or processes spawned by the router's web or Twonky service.
  • Watch for command-injection patterns such as semicolons, pipes, backticks, or $() in requests to the router's CGI endpoints.

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://www.tenable.com/security/research/tra-2018-08 ExploitThird Party Advisory
https://www.tenable.com/security/research/tra-2018-08 ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2013-7173Belkin n750 firmware classic buffer overflow vulnerabilityBelkin n750 routers have a buffer overflow.EPSS 2.0%9.8CVE-2018-1144Belkin n750 firmware os command injection vulnerabilityA remote unauthenticated user can execute commands as root in the Belkin N750 using firmware version 1.10.22 by sending a crafted HTTP request to pro…EPSS 6.9%9.8CVE-2018-1145Belkin n750 firmware memory buffer overflow vulnerabilityA remote unauthenticated user can overflow a stack buffer in the Belkin N750 using firmware version 1.10.22 by sending a crafted HTTP request to prox…EPSS 25%7.5CVE-2018-1146Belkin n750 firmware vulnerabilityA remote unauthenticated user can enable telnet on the Belkin N750 using firmware version 1.10.22 by sending a crafted HTTP request to set.cgi. When …EPSS 29%8.8CVE-2026-53266Linux kernel ebtables SNAT out-of-bounds write in ARP rewriteThe ebtables SNAT target rewrites the ARP sender hardware address via skb_store_bits() without first making that range writable. When the ARP SHA byt…KEVEPSS 0.65%analysed8.8CVE-2026-87491Google Chrome V8 out-of-bounds write enables sandbox code executionChrome before 153.0.8010.36 contains an out-of-bounds write in the V8 JavaScript engine. A crafted HTML page can trigger the memory corruption, and b…KEVEPSS 3.1%analysed9.8CVE-2025-25249Fortinet FortiOS and FortiSwitchManager heap buffer overflow via crafted packetsA heap-based buffer overflow (CWE-122/CWE-787) in Fortinet FortiOS 6.4 through 7.6.3 and FortiSwitchManager 7.0 through 7.2.6 lets an unauthenticated…KEVEPSS 3.9%analysed7.8CVE-2026-83549SonicWall SMA1000 AMC OS Command InjectionThe SMA1000 Appliance Management Console contains an OS command injection flaw (CWE-78) that lets an authenticated administrator execute arbitrary op…KEVEPSS 11%analysed

Source: NIST National Vulnerability Database (record CVE-2018-1143), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.