EUVD-2026-14327
GHSA-gh64-hffv-c24x
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Command injection prevention
MITRE ATT&CK
1 technique across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | While the CVSS score of 6.3 suggests moderate risk, the real-world threat is elevated due to multiple factors. The attack requires low privilege (PR:L) but is network-accessible (AV:N) and has low complexity (AC:L), making it practical to exploit. The CVSS vector indicates partial confidentiality, integrity, and availability impact (C:L/I:L/A:L), consistent with command execution capabilities. Most critically, a public proof-of-concept exploit exists (per references to GitHub repository), significantly increasing exploitation probability. The CVSS E:P (Proof of Concept available) and RL:X (Unspecified/Unknown remediation status) flags suggest the vendor has not yet released a patch, leaving devices vulnerable indefinitely. This is a genuine priority: authenticated command injection on internet-facing network devices with no available patch presents operational risk to home and small business users who cannot easily upgrade or isolate affected routers. |
| Exploit ScenarioDerived | An attacker with valid router credentials (obtained through credential compromise, default credentials, or social engineering) accesses the web management interface and sends a crafted HTTP request to /goform/WriteFacMac with a malicious 'mac' parameter containing shell metacharacters, such as 'aa:bb:cc:dd:ee:ff; telnetd -l /bin/sh'. The router executes the injected command, spawning a telnet daemon that allows the attacker to gain shell access to the device and pivot further into the home or business network. Given the public availability of the proof-of-concept exploit, automated scanning and exploitation of vulnerable F453 routers is a realistic threat. |
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Alert meAnalysisAIv1 – Mar 22, 2026
Unauthenticated attackers can execute arbitrary commands on Tenda F453 routers (version 1.0.0.3) by injecting malicious input through the mac parameter in the /goform/WriteFacMac endpoint. Public exploit code exists for this vulnerability, enabling remote code execution with minimal attack complexity. A patch is not currently available.
Earlier versions of this analysis (1)
A command injection vulnerability exists in Tenda F453 firmware version 1.0.0.3 within the FormWriteFacMac function of the /goform/WriteFacMac endpoint, allowing authenticated attackers to execute arbitrary commands remotely. The vulnerability stems from insufficient input validation on the 'mac' parameter, enabling OS command injection with medium severity (CVSS 6.3). A public proof-of-concept has been released and the vulnerability is actively documented, making it a realistic attack vector against deployed Tenda F453 devices.
RemediationAI
Check Tenda's official security advisory and firmware repository at https://www.tenda.com.cn/ for available firmware updates beyond version 1.0.0.3; if a patched version is available, update the router immediately via the web interface (Administration > System Tools > Firmware Upgrade). If no patch is available from the vendor, implement network-level mitigations: restrict access to the router's web management interface to trusted IP addresses only via firewall rules, disable remote management (WAN access to the router's administrative interface), change default credentials to strong passwords, and consider isolating the F453 on a dedicated network segment if operating in an enterprise environment. Monitor the router's system logs for suspicious activity and contact Tenda support directly to request a security update timeline.
Affected VersionsENISA
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in euvd
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
The vulnerability resides in the web management interface of Tenda F453 routers, specifically in the FormWriteFacMac function that handles MAC address configuration. The affected CPE is cpe:2.3:a:tenda:f453:*:*:*:*:*:*:*:*, indicating all versions of the F453 firmware are in scope. The root cause is classified under CWE-77 (Improper Neutralization of Special Elements used in a Command), which occurs when user-supplied input (the 'mac' parameter) is passed directly to system command execution functions without proper sanitization. This allows attackers to inject shell metacharacters (e.g., semicolons, pipes, backticks) to break out of the intended command context and execute arbitrary shell commands on the underlying Linux-based router OS.
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Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
Lifecycle Timeline
4DescriptionCVE.org
A security flaw has been discovered in Tenda F453 1.0.0.3. The affected element is the function FormWriteFacMac of the file /goform/WriteFacMac. The manipulation of the argument mac results in command injection. It is possible to launch the attack remotely. The exploit has been released to the public and may be used for attacks.
Executive ViewAI
Organizations using A security flaw should be aware of moderate risk from CVE-2026-4554, a command injection vulnerability rated CVSS 6.3. Exploitation could allow attackers to execute code or inject malicious input. Proof-of-concept code is publicly available. Organizations should apply vendor updates when available and monitor for exploitation.
Apply vendor patch. If patching is delayed: deploy WAF rules, restrict network access, enable logging.
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
VulDB
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
OS command injection occurs when an application passes unsanitized user input directly into system shell commands.
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