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CVE-2018-14558

Published: Oct 30, 2018Updated: Nov 7, 2025 Sources: CVE List NVDCWE-78
9.8CRITICAL
NVD MITRE
EPSS Score
8.7%
Top 5.3%
CISA KEV
Active Exploitation
Since Nov 3, 2021
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

Description

An issue was discovered on Tenda AC7 devices with firmware through V15.03.06.44_CN(AC7), AC9 devices with firmware through V15.03.05.19(6318)_CN(AC9), and AC10 devices with firmware through V15.03.06.23_CN(AC10). A command Injection vulnerability allows attackers to execute arbitrary OS commands via a crafted goform/setUsbUnload request. This occurs because the "formsetUsbUnload" function executes a dosystemCmd function with untrusted input.

In plain language

AI Act now

This is a critical security hole in certain Tenda router firmware that lets an attacker take full control if they can reach the router’s web page—so yes, a typical small business should worry if your device is exposed to the network.

Executive summary

CVE-2018-14558 is an unauthenticated command injection in Tenda ac7 firmware, ac9 firmware, and ac10 firmware where a crafted HTTP request to the goform/setUsbUnload endpoint can inject shell commands for full remote control.

If affected, business impact
Full router takeoverDevice used as malware proxyNetwork disruption and downtimeService theft via unauthorized use

What to do now

  1. Check whether your Tenda AC7, AC9, or AC10 router’s current firmware version is within the affected range (AC7 through V15.03.06.44_CN, AC9 through V15.03.05.19(6318)_CN, AC10 through V15.03.06.23_CN).
  2. Verify whether the router’s web interface is reachable from outside your local network (for example, via the WAN/Internet), not just from your internal computers/phones.
  3. If it is Internet-reachable, immediately block inbound access to the router’s web interface from the Internet using your firewall/router rules (allow only trusted internal IPs).
  4. Contact your vendor/support channel and request the specific fixed firmware for CVE-2018-14558 for your exact model and current firmware; install it as soon as a version is provided.
  5. If you cannot obtain a fixed firmware promptly, treat the device as compromised-risk: keep it isolated from the Internet and restrict all inbound management access until patched.
May need vendor / contractor work

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-78

Affected Products

tenda
commercial·CN
ac7 firmware
Networking Infrastructure
ac9 firmware
Networking Infrastructure
ac10 firmware
Networking Infrastructure
and 1 more affected products View all →

Exploitability

CISA Known Exploited Vulnerability
Added to KEV:Nov 3, 2021
Remediation due:May 3, 2022

Required action: Apply updates per vendor instructions.

Is your org exposed to CVE-2018-14558?We can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Execution
View detailed technique mapping

References

https://github.com/zsjevilhex/iot/blob/master/route/tenda/tenda-01/Tenda.md
github.com
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-14558
cisa.gov
News mentions
3

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