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Vulnerability record · CVE-2011-5010 · published 25 December 2011

CVE-2011-5010: Ctek SkyRouter 4200/4300 CGI command injection via PINGADDRESS

Ctekproducts · Skyrouter

The cfg_ethping.cgi script in Ctek SkyRouter 4200 and 4300 passes the PINGADDRESS parameter to a shell without sanitization, allowing shell metacharacter injection. An unauthenticated remote attacker can run arbitrary commands on the router, which sits at the network edge and is fully compromised by this flaw.

10.0 CVSS 2.0 High EPSS 66% · top 0.8% CWE-264 · Permissions and access controls
10.0CVSS 2.0 base score
66%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References, 2 tagged exploit
16 Jun 2026Last modified by NVD

Description

apps/a3/cfg_ethping.cgi in the Ctek SkyRouter 4200 and 4300 allows remote attackers to execute arbitrary commands via shell metacharacters in the PINGADDRESS parameter for a "u" action.

AV:N/AC:L/Au:N/C:C/I:C/A:C

Automated analysis

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

critical priorityUnauthenticated remote command execution with a CVSS 2.0 score of 10, a public exploit, and very high EPSS probability make this an urgent edge-device risk.

What it is

The cfg_ethping.cgi script in Ctek SkyRouter 4200 and 4300 passes the PINGADDRESS parameter to a shell without sanitization, allowing shell metacharacter injection. An unauthenticated remote attacker can run arbitrary commands on the router, which sits at the network edge and is fully compromised by this flaw.

Impact

An attacker gains arbitrary command execution with the privileges of the CGI process, giving full control of the device (confidentiality, integrity and availability all rated complete). This can expose or redirect network traffic and provide a foothold inside the perimeter.

Attack surface

Reachable over the network via HTTP requests to apps/a3/cfg_ethping.cgi with a crafted PINGADDRESS value and a "u" action. The CVSS vector (AV:N/AC:L/Au:N) indicates no authentication and no user interaction are required.

Exploitation

Not listed in CISA KEV, but EPSS is 0.64795 (99.2nd percentile) and a public Exploit-DB entry (18172) exists, so exploitation is practical and likely.

What to do

  • Apply the vendor fix or firmware update for SkyRouter 4200/4300 if still supported; if no patch exists, retire or replace the device.
  • Block or restrict external access to the router's web management interface and the apps/a3/cfg_ethping.cgi endpoint.
  • Do not expose the device's HTTP management port to untrusted networks; place it behind a firewall or VPN.
  • If the device cannot be patched or isolated, disable the ethping diagnostic functionality where possible.

Detection

  • Monitor HTTP requests to apps/a3/cfg_ethping.cgi for shell metacharacters (;, |, &, $(), backticks) in the PINGADDRESS parameter.
  • Alert on unexpected outbound connections or processes spawned by the router's web server.
  • Review router logs for anomalous ping or diagnostic actions and for requests from untrusted source addresses.

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
http://dev.metasploit.com/redmine/issues/5610
http://osvdb.org/77497
http://secunia.com/advisories/47003 Vendor Advisory
http://www.exploit-db.com/exploits/18172 Exploit
http://www.securityfocus.com/bid/50867
http://dev.metasploit.com/redmine/issues/5610
http://osvdb.org/77497
http://secunia.com/advisories/47003 Vendor Advisory
http://www.exploit-db.com/exploits/18172 Exploit
http://www.securityfocus.com/bid/50867

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Source: NIST National Vulnerability Database (record CVE-2011-5010), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.