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Introduction
Industrial networking hardware is rapidly becoming one of the most attractive targets for cybercriminals, and the latest wave of attacks against Four-Faith industrial routers proves just how dangerous exposed edge devices can be. A critical vulnerability tracked as CVE-2024-9643 is now being heavily exploited in the wild, allowing attackers to hijack vulnerable routers and absorb them into massive botnets used for DDoS attacks, proxy operations, and long-term infrastructure abuse.
Security researchers warn that the exploitation activity has escalated dramatically in recent weeks, moving from isolated probing to full-scale automated attacks. The flaw impacts Four-Faith F3x36 industrial routers and stems from hard-coded administrative credentials embedded directly inside the device firmware. Because these credentials cannot be changed by users, attackers can bypass authentication entirely and gain administrator-level control over affected systems.
The situation is especially alarming because these routers are commonly deployed in industrial environments, remote infrastructure, transportation systems, and enterprise edge networks. Once compromised, they become valuable assets for botnet operators seeking persistent, low-visibility devices connected directly to the internet.
Hard-Coded Credentials Open the Door to Full Device Takeover
The vulnerability exists in firmware version 2.0.0 of the Four-Faith F3x36 router series. Researchers discovered that the firmware ships with hidden administrative credentials embedded inside the web management interface. Attackers who know these credentials can send crafted HTTP requests to administrative endpoints such as /Status_Router.asp and instantly gain unrestricted access to the router.
The flaw has been categorized under CWE-489, which relates to active debug code left inside production systems, and CWE-798, referring to the use of hard-coded credentials. Together, these weaknesses create an extremely dangerous attack surface because authentication protections are effectively bypassed.
Security experts compare CVE-2024-9643 to the earlier CVE-2023-32645 vulnerability discovered in the same product family. The similarity between both flaws suggests that secure development practices may not have been fully implemented across the Four-Faith firmware ecosystem.
The danger increased significantly after a public Nuclei template became available online. That template allows attackers to automate scanning and exploitation attempts across the internet with minimal technical knowledge. Once exploitation tooling becomes public, mass scanning campaigns typically follow within days, and that is exactly what researchers are now observing.
Four-Faith Devices Already Have a History of Botnet Abuse
This is not the first time Four-Faith networking devices have appeared in large-scale cyberattacks. In late 2024, a Mirai-based botnet variant exploited another vulnerability, CVE-2024-12856, targeting both F3x24 and F3x36 routers.
That earlier campaign maintained roughly 15,000 active infected IP addresses per day and was linked to DDoS attacks exceeding 100 Gbps. The scale of those attacks demonstrated how valuable industrial edge devices have become to cybercriminal organizations.
More recently, FortiGuard Labs uncovered the RondoDox botnet, which also weaponized CVE-2024-12856 together with flaws in TBK DVR systems. Researchers noted that the malware used specially crafted network libraries capable of disguising malicious traffic as gaming or VPN activity, helping attackers evade detection systems.
Now, CVE-2024-9643 introduces yet another high-confidence attack vector for the same hardware line. The combination of multiple exploitable vulnerabilities within the same router ecosystem dramatically increases long-term risk exposure for organizations still operating outdated firmware.
Exploitation Activity Accelerates Rapidly
The exploitation timeline paints a troubling picture of how quickly attackers operationalized the vulnerability.
The flaw was publicly disclosed on February 4, 2025. More than a year later, on April 15, 2026, CrowdSec released a dedicated detection rule to identify exploitation attempts targeting the routers.
Only five days later, on April 20, 2026, the first confirmed in-the-wild exploitation attempts were detected.
By May 12, 2026, CrowdSec officially reclassified the attacks as “Mass Exploitation,” signaling that the activity had evolved beyond isolated incidents into widespread automated campaigns.
As of May 18, researchers recorded 139 unique attacking IP addresses actively targeting exposed systems.
The speed of this escalation is particularly concerning. Attackers moved from initial exploitation to global-scale automation in less than 30 days, highlighting how quickly cybercriminal groups adapt once reliable exploit methods become publicly available.
Commerce and Enterprise Infrastructure Are Primary Targets
According to telemetry data collected by CrowdSec, roughly 76% of attacker activity appears focused on infrastructure takeover operations. This strongly suggests that attackers are not simply testing systems for research purposes. Instead, they are actively attempting to convert vulnerable routers into persistent botnet nodes.
Commerce organizations represent the largest group of affected environments. This trend aligns with broader attacker strategies focused on acquiring stable, always-online edge devices that can quietly operate in the background for extended periods.
Compromised routers can serve several criminal purposes simultaneously:
Launching DDoS attacks
Acting as proxy infrastructure
Routing malicious traffic anonymously
Hosting malware payloads
Serving as footholds for deeper network intrusion
Enabling credential theft and lateral movement
Researchers also observed attacking infrastructure originating from the United Kingdom, Germany, the United States, and the Netherlands. The geographic diversity indicates automated scanning operations rather than targeted nation-state campaigns.
Perhaps the most alarming statistic comes from Censys internet scans, which identified more than 15,000 internet-facing Four-Faith devices still exposed online. That enormous attack surface gives botnet operators a massive pool of potential victims.
Mitigation Steps Cannot Be Delayed
Security experts are urging organizations to patch affected systems immediately. CVE-2024-9643 carries a CVSS severity score of 9.8, placing it among the most critical categories of remotely exploitable vulnerabilities.
Organizations using Four-Faith F3x36 routers should immediately apply updated firmware versions provided by the manufacturer. Delaying remediation significantly increases the chance of compromise due to the already widespread availability of automated exploitation tools.
Administrators should also remove management interfaces from direct internet exposure. Router administration panels should only be accessible through VPN connections or restricted firewall access control lists.
Deploying security monitoring solutions such as CrowdSec can help detect ongoing exploitation attempts against exposed services and management endpoints.
Experts also recommend auditing systems for additional vulnerabilities affecting the same router family, including CVE-2024-12856 and CVE-2024-9644, both of which have already been incorporated into active malware campaigns including Mirai variants and RondoDox botnets.
What Undercode Say:
The Four-Faith incident reflects a much larger and increasingly dangerous cybersecurity trend: industrial infrastructure is becoming consumer-grade in exposure but remains enterprise-critical in function. That combination creates the perfect target for attackers.
For years, industrial routers were considered niche hardware, often ignored by mainstream cybercriminals. Today, that assumption no longer holds true. Attackers now understand that edge devices offer enormous operational value. They are always online, rarely monitored properly, frequently outdated, and often deployed in environments where downtime is unacceptable.
Hard-coded credentials remain one of the most reckless mistakes a manufacturer can make in firmware development. The fact that vulnerabilities of this type continue appearing in industrial equipment suggests that many vendors still prioritize functionality and rapid deployment over secure coding practices.
What makes CVE-2024-9643 particularly dangerous is not just the flaw itself, but the maturity of the attacker ecosystem surrounding it. Public exploit templates, automated scanners, botnet frameworks, and stealth traffic manipulation tools already exist. Cybercriminals no longer need sophisticated research teams to weaponize vulnerabilities. The barrier to entry has collapsed.
The repeated appearance of Four-Faith devices in Mirai-related attacks also highlights a critical issue in IoT and industrial security: once attackers identify a reliable hardware family, they continue targeting it repeatedly across multiple years and vulnerabilities. Devices become “known good targets” inside underground communities.
Another concerning element is the convergence between enterprise infrastructure and cybercrime monetization. Botnets today are not only used for DDoS attacks. They are rented as proxy networks, leveraged for credential stuffing, crypto abuse, anonymization services, phishing infrastructure, and malware distribution pipelines.
Industrial routers are especially attractive because they often sit outside centralized endpoint detection systems. Many organizations monitor laptops and servers closely while completely ignoring networking appliances. Attackers know this.
The geographic spread of attacking IPs further suggests highly automated operations rather than coordinated manual intrusion teams. Modern botnet campaigns increasingly resemble cloud-scale operations with distributed infrastructure, rapid adaptation, and modular malware deployment.
The discovery of over 15,000 internet-facing devices should be a wake-up call for organizations still relying on outdated perimeter assumptions. Edge hardware is now part of the active battlefield. Any device exposed online will eventually be scanned, fingerprinted, and attacked.
This situation also demonstrates why vulnerability disclosure alone is no longer enough. Many organizations fail to patch even after public disclosure, creating massive exploitation windows. In practice, the race between defenders and attackers is often lost within days once exploit automation becomes available.
From a strategic perspective, industrial networking vendors may soon face much stronger regulatory scrutiny if insecure firmware practices continue. Hard-coded credentials in critical infrastructure hardware are increasingly viewed as unacceptable design failures rather than simple bugs.
The broader lesson is clear: industrial cybersecurity can no longer operate separately from mainstream cybersecurity operations. The same botnets targeting home routers are now evolving toward enterprise and industrial environments because the financial incentives are far greater.
Organizations that continue exposing administrative interfaces directly to the internet are effectively gambling against automation at global scale. Eventually, automation wins.
Fact Checker Results
✅ CVE-2024-9643 is correctly identified as a critical authentication bypass vulnerability affecting Four-Faith F3x36 industrial routers.
✅ The article accurately reflects that public exploit tooling and Nuclei templates significantly increase the speed of mass exploitation campaigns.
❌ There is currently no public evidence linking the attacks directly to a specific nation-state actor; available indicators point primarily toward automated cybercriminal botnet activity.
Prediction
🔮 Botnet operators will continue shifting focus toward industrial and enterprise edge devices because they provide longer persistence and higher operational value than consumer IoT hardware.
🔮 Future Mirai-style malware families will likely incorporate multi-vulnerability exploitation chains targeting Four-Faith routers and similar industrial networking equipment simultaneously.
🔮 Regulatory pressure on industrial hardware vendors will increase as governments and enterprise customers demand stricter firmware security standards and the elimination of hard-coded credentials from production systems.
🕵️📝Let’s dive deep and fact‑check.
References:
Reported By: cyberpress.org
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