Your security team patches servers, hardens endpoints, and monitors cloud workloads. Meanwhile, your routers run firmware from 2019 and haven't been reviewed since deployment. This gap isn't just technical debt; it's what attackers are counting on.
These myths persist because network infrastructure often sits in a visibility blind spot. It's managed by different teams, exempt from endpoint security tools, and rarely included in incident response playbooks. When Sygnia tracked the Fire Ant campaign targeting Cisco IOS XR routers, they found attackers exploiting exactly this oversight: compromising routers to monitor organizations, steal credentials, and infiltrate connected networks. The campaign remained active through 2026, evolving to exploit infrastructure relationships between victims and third-party environments.
Here's what your team probably believes about router security, and why each assumption creates exploitable gaps.
Myth 1: Routers Are Just Pass-Through Devices
Reality: Routers provide attackers with network-wide visibility and control that endpoints can't match.
When Fire Ant actors compromised Cisco routers, they didn't just gain another access point. They captured traffic from multiple routers across environments, uploading data to external infrastructure. This gave them a comprehensive view of how systems, administrators, and connected networks interacted, what Sygnia called "perspective," not just reach.
Your router sees every packet, every credential exchange, every administrative session. An attacker controlling that device observes the environment from the inside, planning lateral movement and identifying high-value targets without triggering endpoint detection tools. ISO/IEC 27002 control 8.20 addresses network security, but most implementations focus on segmentation rules rather than the security posture of the network devices themselves.
Myth 2: We'll See Router Compromises in Our SIEM
Reality: Router activity typically sits outside your security monitoring coverage.
Fire Ant actors manipulated logs, deleted files, and tampered with firewall rules to conceal their activity. But the bigger issue? Most security operations centers don't ingest router logs in the first place, or they collect them without parsing for anomalous patterns.
Your SIEM might capture authentication events, but does it alert on unusual firmware modifications, unexpected process launches, or configuration changes outside maintenance windows? Network devices are often exempt from the continuous monitoring you apply to servers and workloads. NIST Cybersecurity Framework (CSF) 2.0 function DE.CM-1 calls for monitoring networks to detect potential cybersecurity events, but implementation typically stops at traffic analysis, not device-level behavioral monitoring.
Myth 3: TACACS+ Logs Give Us Admin Accountability
Reality: Compromised TACACS servers turn your audit trail into an attacker asset.
Fire Ant specifically targeted TACACS servers, the administrative checkpoints that authenticate users, authorize commands, and record activity. By compromising this layer, attackers harvested credentials as they were used and observed administrative activity in real time.
Worse, the compromise created ambiguity between legitimate accounts and malicious activity. Your audit logs show authorized credentials executing valid commands. Without additional context, behavioral baselines, session anomaly detection, command pattern analysis, you can't distinguish an administrator from an attacker using stolen credentials. NIST SP 800-53 control AU-6 requires audit review and analysis, but that control assumes the audit system itself hasn't been compromised.
Myth 4: We Patch Critical Vulnerabilities Within 30 Days
Reality: Your patching SLA probably doesn't cover network infrastructure on the same timeline.
Most organizations maintain separate patching cycles for network devices, often quarterly or tied to maintenance windows. Fire Ant remained active through 2026, evolving its techniques while defenders worked through change control processes.
The sophistication here matters: attackers built malware specifically to control routers and modify them for easier management. They weren't exploiting a single CVE; they were establishing durable access through custom tooling designed for your specific router models. Your 30-day server patching window doesn't help when network devices operate on a different calendar. CIS Critical Security Controls 7.1 and 7.2 address remediation processes, but implementation varies widely between server infrastructure and network devices.
Myth 5: Our Firewall Protects the Router Behind It
Reality: Routers, hypervisors, and access appliances create trust relationships your perimeter doesn't see.
Sygnia observed Fire Ant exploiting infrastructure relationships to breach high-value networks and critical infrastructure. The 2026 compromises impacted both direct victims and third-party environments, attackers used one organization's compromised router to reach connected partners.
Your firewall rules govern north-south traffic, but routers establish east-west trust that bypasses traditional perimeter controls. An attacker controlling your router can manipulate routing tables, redirect traffic, and access management networks that your firewall assumes are internal and trusted. Zero Trust Architecture principles apply here: infrastructure devices need the same "never trust, always verify" approach you apply to user access.
Myth 6: We Can Investigate Router Compromises Like Server Incidents
Reality: Network devices require specialized forensic capabilities most IR teams don't maintain.
When your team responds to a server compromise, you image the disk, collect memory, and analyze process trees. Router forensics looks nothing like this. Fire Ant actors deleted files and manipulated evidence specifically because they understood defenders lack tooling and playbooks for network device investigation.
Your incident response plan probably includes runbooks for ransomware, business email compromise, and cloud account takeover. Does it cover how to forensically capture router state without disrupting production traffic? How to validate firmware integrity? How to preserve volatile memory from a network device? NIST SP 800-61 provides incident handling guidance, but most organizations haven't adapted those principles to infrastructure devices that can't run EDR agents or forensic collectors.
What to Do Instead
Treat routers, hypervisors, and access appliances as "first-class security forensic assets." That means:
Extend your monitoring posture. Ingest router logs into your SIEM with parsing rules that detect configuration changes, unusual process execution, and authentication anomalies. Don't just collect the logs, build detection logic for the patterns that matter.
Separate your trust layers. Don't use the same TACACS server for all administrative access. Segment critical infrastructure management onto dedicated authentication systems with enhanced monitoring. Consider implementing Just-in-Time Access for network device administration, requiring approval workflows for elevated sessions.
Harden infrastructure devices with the same rigor you apply to servers. Disable unused services, enforce strong authentication, restrict management access to specific source IPs, and maintain firmware currency. ISO/IEC 27001 Annex A control 8.8 addresses management of technical vulnerabilities, apply it to network devices, not just compute resources.
Build IR capabilities for infrastructure. Develop runbooks, acquire tools, and train your team on network device forensics before you need them. Test your ability to investigate a router compromise during tabletop exercises.
Validate continuously, not periodically. Fire Ant evolved from 2025 into 2026 while remaining active. Quarterly reviews won't catch persistent access. Implement ongoing validation of trust relationships across your management infrastructure, configuration drift detection, behavioral monitoring, and integrity checking.
Your routers aren't just networking equipment. They're high-value targets providing attackers with visibility, control, and persistence your endpoint tools can't detect. The question isn't whether infrastructure devices deserve security investment. It's whether you'll close this gap before or after an incident.
