Bottom Line
Edge device exploitation surged from 3% to 22% of breaches in a single year. Organizations need a separate, accelerated patch track for edge assets, backed by real-time inventory, exploitability-based prioritization, and redundancy that removes the downtime barrier. When immediate patching isn’t possible, compensating controls like vendor mitigations, access restrictions, and virtual patching can limit exposure in the interim.
In 2023, exploitation of vulnerabilities in network edge devices accounted for 3% of breaches. By 2024, that number had jumped to 22%, according to the 2025 Verizon DBIR. That is an almost 8x increase in a single year, and it reflects a fundamental shift in how attackers approach your network.
Your VPNs, firewalls, and web servers sit at the front door. They are internet-facing, always on, and probed constantly. Most organizations patch these monthly, as they do with internal systems, but this is not enough. A monthly patch cycle leaves too much room for threat actors to strike.
In this article, we’ll examine why internet-facing systems are disproportionately targeted, why standard patch cycles are too slow for edge devices, and what strategies your organization can adopt to streamline and speed up remediation on your most exposed infrastructure.
Why Internet-Facing Systems Are The Primary Target
Attackers use automated tools to constantly scan anything they have access to, looking for vulnerabilities. This includes anything that is exposed to the public internet. As soon as a vulnerability is identified, threat actors can begin exploitation within days, sometimes hours, of a CVE being identified.
Edge devices occupy a uniquely dangerous position in your infrastructure. They sit at the network boundary with direct internet exposure, often running proprietary or embedded firmware that limits your visibility into what is happening on them, and typically operate with the kind of elevated privileges that make them high-value targets. Traditional Endpoint Detection and Response (EDR) tools do not run on these devices, so a compromise can go undetected for longer than it would on a standard workstation or server.
VPN vulnerability management has become a top priority for security teams for exactly this reason. A compromised VPN appliance does not just give attackers access to a single endpoint; it gives them authenticated access to your internal network, often with the same trust level as a legitimate remote employee.
The most frequently exploited vulnerabilities are all edge devices, according to Mandiant. These are VPNs, firewalls, and routers. The logic from an attacker’s perspective is straightforward: internet-facing systems are reachable without any initial foothold, they often run with elevated privileges and have direct access to internal networks.
To make matters more complex, there is also a “remediation gap.” This is the time lag between discovering a security vulnerability and fixing it. The Verizon DBIR found that only 54% of edge device vulnerabilities were fully remediated, and the median time to remediation was 32 days. For a device that is directly exposed to the internet, 32 days is a long time to remain vulnerable.
Why Standard Patch Cycles Are Too Slow
Most organizations run monthly or quarterly patch cycles tied to vendor release schedules. This is great for internal systems where exploitation requires an attacker to already be inside your network. The chances of an attacker being able to breach your network and exploit a vulnerability within a month are slim. But for internet-facing systems, where exploitation windows are measured in hours or days, this approach creates an unacceptable gap between disclosure and remediation.
The risk with patching a VPN or firewall is that it may lead to downtime. Taking a critical gateway offline during business hours can disrupt remote access for the entire organization. It may result in services being inaccessible or productivity hampered. But the alternative, leaving a known vulnerability unpatched on an internet-facing device, is worse. This is the type of dilemma that CISOs know all too well.
Edge devices need their own accelerated patch track, separate from your general infrastructure patching schedule. The risk profile is fundamentally different, and the remediation timeline should reflect that.
Strategies For Accelerating Edge Device Patching
Maintain a Real-Time Inventory of Internet-Facing Assets
You cannot patch exposures that you are unaware of. Without checking, there is no way of knowing how many forgotten VPN appliances, legacy web servers, or shadow IT devices are live within your environment. Attack surface management tools and external vulnerability scanning can help to identify every asset that is reachable from the public internet. Once you know what these assets are, you’re in a much better position to secure them.
Establish a Separate Patch SLA for Internet-Facing Systems
Organizations should define faster remediation timelines for anything publicly exposed. A practical starting point would be critical CVEs on internet-facing devices should be patched within 24 to 48 hours of a patch being available. Having a documented, separate SLA creates accountability and ensures edge device security does not get deprioritized behind less urgent internal patches.
Prioritize Using Exploitability Data, Not Just CVSS Scores
CVSS tells you how severe a vulnerability is in theory. CISA’s Known Exploited Vulnerabilities (KEV) catalog, EPSS scores, and threat intelligence feeds tell you what is actually being exploited in the wild right now. An edge device vulnerability with a CVSS score of 7.5 that is being actively exploited is a more urgent priority than an internal vulnerability with a CVSS score of 9.8 that has no known exploitation.
Build Redundancy That Enables Patching
One of the biggest barriers to fast patching is the fear of extended downtime. High-availability pairs, failover clusters, and staged rollouts allow you to take one device offline for patching, while the other continues to handle traffic. If your edge infrastructure does not support this, that is a gap worth addressing. You want to build an environment where patching is easy and normal, allowing productivity and access to remain throughout routine maintenance tasks.
Automate Where Possible
Manual patching processes introduce delay at every step. Identifying the vulnerability, downloading the patch, scheduling the window, applying it, and verifying success. Automated patch deployment pipelines for edge devices, firmware update workflows, and integration with your vulnerability management platform can streamline processes and speed up this timeline significantly. The goal is to reduce the gap between “patch available” and “patch applied” to the shortest window your environment can support.
When You Cannot Patch Immediately: Compensating Controls
Not every edge device can be patched within hours. Vendor delays, compatibility testing, and operational constraints are real. When immediate patching is not possible, compensating controls help reduce your exposure while you work toward remediation:
- Apply vendor-provided mitigations and workarounds. Most vendors publish interim guidance alongside critical advisories. These may include configuration changes, disabling specific features, or applying access restrictions.
- Restrict access to management interfaces. Limit who can reach the administrative console of your edge devices, ideally to specific internal IP ranges only.
- Enable enhanced logging and monitoring. Increase logging on vulnerable devices and feed those logs into your SIEM or detection platform so you can identify exploitation attempts early.
- Deploy virtual patching through WAF or IPS rules. Web application firewalls and intrusion prevention systems can block known exploit patterns at the network level while you wait for a permanent fix.
- Segment vulnerable devices from critical internal assets. If a device cannot be patched, limit the damage a compromise can cause by restricting what it can reach on your internal network.
Conclusion
Internet-facing systems are where attackers look first, and they are where your fastest patch response needs to be. This is proven by the fact that edge device exploitation has surged over the past two years. All the while, remediation timelines remain too slow, and the gap between disclosure and exploitation continues to shrink.
The organizations that avoid becoming headlines are the ones that treat edge device security as a distinct, accelerated discipline rather than folding it into general patch management. Maintain a real-time inventory of what is exposed, set faster SLAs for internet-facing systems, prioritize based on real-world exploitability, build the redundancy that lets you patch without disruption, and have compensating controls ready for the times when immediate patching is not an option.
