The Reveal Platform
Intel Name: Hackers exploit fortigate firewalls in widespread attacks to steal network credentials
Date of Scan: March 18, 2026
Impact: High
Summary: The cybersecurity landscape recently shifted as a major vulnerability emerged within critical infrastructure. Security researchers have observed campaigns where attackers exploit FortiGate firewalls and other firewall vulnerabilities to harvest network credentials and gain persistent access to enterprise environments. This specific campaign targets the very devices designed to protect the corporate perimeter. By compromising these gateways, adversaries gain a direct path into the heart of the enterprise. For a CISO, this situation highlights a vital risk to organizational integrity. You must recognize that a breach at the firewall level grants an attacker the “keys to the kingdom.” Consequently, this allows them to bypass traditional internal security checks with ease. Security advisories and threat research reports have increasingly highlighted firewall vulnerabilities as attractive entry points for attackers seeking credential access and persistent footholds inside enterprise networks.
The actors behind these campaigns may pursue long-term espionage, credential harvesting, or financial gain depending on the threat group involved. While some smaller groups seek immediate financial gain, the primary threat comes from organized entities. These groups aim to establish a permanent presence within your network. By stealing administrative credentials, they can move through your systems without raising any alarms. Their goal involves the silent exfiltration of intellectual property and sensitive strategic plans. Therefore, this is not just a technical failure of a hardware device. It is a calculated attempt to undermine your company’s competitive advantage on a global scale.
Furthermore, these actors are highly methodical in their approach to post-compromise activity. Once they have harvested the necessary credentials, they wait for the most opportune moment to act. This patience makes them far more dangerous than typical opportunistic hackers. They seek to understand your internal communications and financial workflows. Because they operate from within trusted accounts, their actions appear entirely legitimate to standard monitoring tools. For a business leader, this means the risk persists long after the initial firewall vulnerability is patched.
For an executive stakeholder, the fallout from these attacks is both broad and deep. When hackers exploit fortigate firewalls in widespread attacks to steal network credentials, the immediate impact is a total loss of trust in the network architecture. You face significant operational disruption as your IT teams scramble to reset every password and audit every system. This process often takes weeks and halts productive work across the entire company. Moreover, the financial cost of forensic investigations and recovery efforts can quickly reach millions of dollars.
Beyond the immediate costs, the long-term reputational damage is a primary concern. If clients and partners learn that your primary defense mechanism failed, they may question your overall commitment to security. This loss of confidence can lead to canceled contracts and a decrease in market share. Additionally, regulatory bodies now impose strict penalties for failing to protect access credentials. You may face mandatory public disclosures and heavy fines under global data protection laws. Consequently, preventing these perimeter breaches is a fundamental requirement for maintaining your brand’s stability and value.
To understand how this attack works, imagine a high-security office building with a sophisticated front desk. The firewall acts as the security guard at that desk. Usually, the guard checks IDs and ensures no unauthorized person enters the lobby. However, in this scenario, the attackers found a way to trick the guard into handing over the master key ring. They did not have to break a window or climb a fence. Instead, they exploited a flaw in the guard’s own protocols to obtain the keys.
Once the attackers have these “keys,” they no longer look like intruders. They can walk through any door, access any file cabinet, and even sit at the CEO’s desk. In the digital world, this is known as exploiting administrative trust. The hackers use the stolen credentials to act as valid system administrators. They may use legitimate administrative tools to modify logging settings or create additional accounts. Because the system believes they are authorized users, it does not send out any alerts. This allows the hackers to stay inside the building for months while they quietly carry out their mission.
Gurucul provides the necessary clarity to stop these stealthy actors before they can cause damage. Our platform does not just watch the “front desk” of your network. Instead, we monitor the behavior of every person and device inside the building. By utilizing a unified risk engine, Gurucul can spot when a “legitimate” user starts acting like an intruder. Even if hackers exploit FortiGate firewalls in widespread attacks to steal network credentials, they cannot perfectly mimic the unique habits of your real employees.
Our approach shifts the focus from simple access to behavioral integrity. For example, if a system administrator suddenly accesses a sensitive database at an unusual time, Gurucul flags this as a high-risk event. We analyze behavioral patterns and contextual risk signals in near real time. Because we correlate data from across the entire enterprise, we can see the full story of an attack. We connect the initial firewall breach to the subsequent lateral movement. This ensures that your security team can intervene before any data is stolen or systems are sabotaged.
The most effective tool in the fight against stolen credentials is Gurucul User and Entity Behavior Analytics (UEBA). This product is specifically engineered to detect the subtle anomalies that occur when an account is compromised. By monitoring billions of data points, Gurucul UEBA identifies when a valid “key” is being used by an unauthorized hand. It provides a transparent view of the risk associated with every identity in your organization. This allows you to stay ahead of the adversary, even when they have bypassed your perimeter defenses.
A successful defense requires more than just reactive tools; it requires proactive threat assessment strategies. By adopting these modern risk evaluation methods, your organization can identify which accounts and systems are most at risk. Gurucul helps you prioritize your security efforts where they matter most. Consequently, you can build a more resilient infrastructure that resists the tactics used by sophisticated hackers. This strategic approach is essential for protecting your most valuable corporate assets in an era of constant change.
Furthermore, implementing behavioral analytics strategies is the only way to catch attackers who use legitimate administrative tools. Through continuous user behavior monitoring, Gurucul identifies the tiny discrepancies in digital activity that signal a breach. Even if an attacker has the correct password, they cannot replicate the complex behavioral patterns of your actual staff. Our platform detects these differences and provides your team with the context needed for a fast response. This creates a powerful layer of defense that ensures your data remains secure, regardless of the entry point used by the attacker.
For a full technical breakdown of the indicators of compromise associated with these attacks, please visit the Gurucul Community:
