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Vulnerability record · CVE-2014-9727 · published 29 May 2015

CVE-2014-9727: AVM Fritz!Box webcm command injection via var:lang

Avm · Fritz\!Box

AVM Fritz!Box routers pass the var:lang parameter to cgi-bin/webcm without sanitizing shell metacharacters, allowing OS command injection. The flaw is remotely reachable and unauthenticated, and public exploit code exists, so any exposed device is at immediate risk.

10.0 CVSS 2.0 High EPSS 72% · top 0.6% CWE-78 · OS command injection
10.0CVSS 2.0 base score
72%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

AVM Fritz!Box allows remote attackers to execute arbitrary commands via shell metacharacters in the var:lang parameter to cgi-bin/webcm.

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 18 September 2026. Confidence: high.

critical priorityUnauthenticated remote command execution with a CVSS 2.0 score of 10, public exploit code, and a very high EPSS probability make this an urgent exposure for any internet-facing Fritz!Box.

What it is

AVM Fritz!Box routers pass the var:lang parameter to cgi-bin/webcm without sanitizing shell metacharacters, allowing OS command injection. The flaw is remotely reachable and unauthenticated, and public exploit code exists, so any exposed device is at immediate risk.

Impact

An attacker can execute arbitrary commands on the router, gaining full control of the device and any traffic or credentials it handles.

Attack surface

Reached over the network via HTTP requests to cgi-bin/webcm with a crafted var:lang parameter; 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 0.71668 (99.39th percentile) and references include an Exploit-DB entry, indicating public exploit code and active interest.

What to do

  • Apply the vendor firmware update for Fritz!Box that fixes the webcm var:lang handling; if no fix is available, replace or isolate the device.
  • Disable remote access to the router's web interface (cgi-bin/webcm) from the WAN side.
  • Restrict management access to a trusted LAN or VPN and change default administrative credentials.
  • Monitor vendor advisories and retire end-of-support Fritz!Box models that cannot be patched.

Detection

  • Inspect HTTP request logs for cgi-bin/webcm requests containing shell metacharacters (;, |, $(), `) in the var:lang parameter.
  • Alert on outbound connections or processes spawned by the router's web server that are unexpected for normal management traffic.
  • Use the public Exploit-DB PoC (33136) to test exposure of internet-facing Fritz!Box devices in a controlled manner.

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://www.exploit-db.com/exploits/33136 Exploit
http://www.osvdb.org/103289
https://www.trustwave.com/Resources/SpiderLabs-Blog/-Honeypot-Alert--Fritz%21Box-%E2%80%93-Remote-Command-Execution-Expl
http://www.exploit-db.com/exploits/33136 Exploit
http://www.osvdb.org/103289
https://www.trustwave.com/Resources/SpiderLabs-Blog/-Honeypot-Alert--Fritz%21Box-%E2%80%93-Remote-Command-Execution-Expl

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Source: NIST National Vulnerability Database (record CVE-2014-9727), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.