CISA’s required action for CVE-2022-37055 is to apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. In practice, find every instance of D-Link Routers in your estate, apply the vendor security update or documented mitigation, and if no fix can be applied, remove internet exposure or take the product out of service.
When a router vulnerability is a buffer overflow, the practical question is not only whether a fix exists, but whether the device can be trusted to stay reachable long enough to be remediated. For edge devices, a patch may fail, a mitigation may only reduce exposure, and the safest answer is sometimes to remove the device from internet-facing service entirely.
Confirm exposure before you choose the fix path
Start by finding every D-Link router instance in scope, then confirm whether each unit is internet-exposed, remotely manageable, or depended on for critical routing paths. That inventory step matters because a buffer overflow on a perimeter device is usually a high-risk asset problem, not just a software update task.
If you can identify the exact model and software branch, use the vendor advisory and CISA KEV entry to confirm the supported mitigation path rather than guessing from product family alone. For internet-facing routers, validate exposure from the outside as well as from internal asset records, because unmanaged or forgotten appliances are common sources of missed risk.
IoT Security Guide is useful here because the same device-class problems drive many edge and embedded exposures, especially where firmware updates, segmentation, and device identity are inconsistent.
Apply the vendor mitigation or security update first
The preferred outcome is to apply the vendor security update or the documented mitigation exactly as instructed. Where the vendor provides a workaround, treat it as temporary risk reduction, not as a substitute for a corrected build, because overflow flaws often remain exploitable as long as the vulnerable service is still reachable.
If the router supports only limited maintenance windows, schedule the change like any other production edge change: confirm configuration backups, stage rollback options, and test connectivity after reboot. If the mitigation requires disabling a service, changing a port, or restricting management access, document the operational impact so teams do not quietly re-enable the exposed path later.
Vulnerability Management Guide fits this decision point because patching a KEV-listed issue is a prioritisation and verification problem as much as a remediation task.
Use compensating controls if patching must wait
If you cannot apply the fix immediately, reduce exposure aggressively. Remove internet exposure, restrict management interfaces to trusted administrative networks, and place the device behind controls that limit who can reach the vulnerable service. If the router is too old or unsupported for a reliable mitigation, take it out of service rather than leaving it exposed and hoping for the best.
This is especially important for perimeter devices because successful exploitation can lead to denial of service, remote compromise, or follow-on network access depending on the service exposed by the flaw. The key practitioner mistake is treating a workaround as a permanent control when the device still sits at the edge of the network.
NIST National Vulnerability Database, CVE Program, and CISA Known Exploited Vulnerabilities Catalog are the authoritative references for confirming the record, severity context, and exploit-priority status of the issue.
Risk and Threat Considerations
Buffer overflows on routers are dangerous because the vulnerable code often runs in a trust-heavy position with network reach, uptime expectations, and limited local visibility. Once exploited, the impact is rarely confined to the device itself, especially when the router is Internet-facing or used to bridge otherwise separated network zones.
Failure mechanism: An attacker sends crafted input to the vulnerable router service, overflows memory, and uses the resulting crash or code execution path to disrupt availability or gain control of the device.
Impact: The result can be denial of service, remote compromise, loss of trust in the perimeter, or a stepping stone into the internal network if the device was acting as a boundary control.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
CIS Controls v8, NIST SP 800-53 Rev 5 and NIST CSF 2.0 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| CIS Controls v8 | CIS-7 — Continuous Vulnerability Management | Prioritises, tracks, and remediates known exploited vulnerabilities on exposed assets. |
| Recommendation — Prioritise remediation of the vulnerable router and verify exposure is closed. | ||
| NIST SP 800-53 Rev 5 | RA-5 — Vulnerability Monitoring and Scanning | Directly supports identifying and tracking the vulnerable router before remediation. |
| CM-8 — System Component Inventory | Inventory is needed to find all router instances that may still be exposed. | |
| Recommendation — Scan for the affected router and validate that mitigation removed the exposure. Maintain an accurate inventory of router assets so every instance can be patched or retired. | ||
| NIST CSF 2.0 | ID.AM-01 — Physical Devices and Systems Inventoried | Asset inventory is essential to locate all impacted routers in the estate. |
| PR.PS-01 — Configuration Management | Mitigation and hardening depend on controlled configuration changes to the router. | |
| Recommendation — Inventory all router devices so remediation covers every deployment. Apply the documented mitigation and lock in the secure configuration. | ||
Practitioner Guidance
What to verify: Confirm that the vulnerable model is either patched, mitigated exactly as documented, or removed from service. Do not trust a remediation ticket until you have checked the device is no longer reachable on the exposed interface and that the control remains in place after reboot or configuration reload.
Escalation / exception: If a D-Link router cannot be patched and cannot be safely isolated, escalate immediately to replacement or decommissioning. A standing exception is hard to justify for an internet-facing buffer overflow on an edge device.
Practitioner takeaway: For router overflow flaws, the real decision is usually between verified mitigation and removal from service, because keeping an unfixable perimeter device exposed is the risk, not merely running an outdated build.
Related resources from NHI Mgmt Group
- CVE-2022-37055 (D-Link Routers Buffer Overflow)
- How do you patch or mitigate CVE-2020-15069 (Sophos XG Firewall Buffer Overflow)?
- How do you patch or mitigate CVE-2023-33010 (Zyxel Multiple Firewalls Buffer Overflow)?
- How do you patch or mitigate CVE-2025-20333 (Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Buffer Overflow)?