Attackers are increasingly targeting the management systems and devices meant to protect your network, turning firewalls, VPN gateways, and routers into entry points [1, 2]. Between August and September, security researchers tracked 1,699 vulnerabilities across 17 vendors, with 71 capable of remote exploitation without authentication [2]. This shift in tactics means the very infrastructure you rely on for security could be the weakest link in your defenses.
The Shift to Targeting Infrastructure
Historically, attackers focused heavily on compromising servers and endpoints. However, a significant trend for 2024 and 2025 is the direct targeting of network infrastructure [1]. High-profile campaigns have successfully exploited critical bugs in devices from major vendors like Cisco, Fortinet, and Palo Alto Networks [1].
These attacks often begin with automated scanning for internet-exposed services or devices running vulnerable software versions [1, 6]. Once an entry point is identified, attackers deploy exploit code or leverage misconfigurations—such as default credentials—to gain access [1, 3]. Recent reports highlight that vulnerabilities in network management systems are being actively exploited shortly after, or even before, vendors disclose them [2]. For example, a missing authentication vulnerability in a Palo Alto Networks migration tool allowed attackers to remotely reset admin credentials on internet-exposed servers [5].
Why This Matters for Small and Mid-Sized Businesses
For small and mid-sized businesses (SMBs), a compromised network device can be devastating. Firewalls and VPNs are designed to be the perimeter defense; when they are breached, attackers gain direct access to the internal network [3]. From there, they can pivot to other systems, steal sensitive data, or deploy ransomware [5].
SMBs often rely on third-party applications and legacy systems that may not receive timely updates [3, 6]. Furthermore, end-of-life (EOL) devices, such as older routers from Cisco and Linksys, are frequent targets because they no longer receive security patches [5]. If your business operates with misconfigured firewalls or unpatched VPN gateways, you are providing attackers with an easy entry point [6].
How to Secure Your Network Infrastructure
Securing your network devices requires a proactive approach. Follow these concrete steps to reduce your risk:
- Inventory Your Devices: Maintain an accurate inventory of all network devices, including firewalls, routers, switches, and VPN gateways. Note the firmware and software versions running on each.
- Apply Patches Immediately: Establish a strict patching schedule. When a vendor releases a critical security update for a network device, apply it as soon as possible [6]. Do not delay patching internet-facing systems.
- Restrict Management Interfaces: Never expose management interfaces (like SSH or web admin portals) directly to the public internet. Require a secure VPN connection and multi-factor authentication (MFA) to access these interfaces.
- Review Configurations: Regularly audit device configurations. Ensure default credentials are changed immediately upon installation and that unnecessary services or ports are disabled [6].
- Replace End-of-Life Hardware: Identify any network devices that have reached their end-of-life (EOL) and are no longer supported by the vendor. Replace them with current models that receive active security updates [5].
Common Mistakes to Avoid
Many organizations fall into traps that leave their infrastructure vulnerable. One major mistake is a “set it and forget it” mentality regarding network devices. Firewalls and routers require ongoing maintenance and configuration reviews [6]. Another frequent error is failing to monitor vendor security advisories, leaving critical vulnerabilities unpatched for weeks or months [2, 6]. Finally, relying solely on perimeter defenses without implementing internal segmentation allows an attacker who compromises a firewall to move freely across the entire network.
Key Takeaways
- Attackers are actively exploiting vulnerabilities in network devices like firewalls and VPNs to gain initial access.
- Unpatched software, misconfigurations, and end-of-life hardware are the primary entry points for these attacks.
- Management interfaces must be restricted and never exposed directly to the public internet.
- Timely patching of network infrastructure is critical to defending against these threats.
Sources
- Network Vulnerabilities 2025: Risks, Trends & Defense [1]
- InfraTrust report warns network management systems under attack [2]
- How Attackers Exploit Network Vulnerabilities | Cybersecurity Risks [3]
- Infographic: A History of Network Device Threats and What Lies Ahead [5]
- Top 5 Network Vulnerabilities (and How to Fix them) [6]
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