CVE-2022-37055: D-Link Routers Buffer Overflow Vulnerability

D-Link routers are affected by a buffer overflow vulnerability tracked as CVE-2022-37055. The flaw carries a high impact on confidentiality, integrity, and availability. Impacted devices may already be at end-of-life or end-of-service status, which limits vendor support options.

How it works

The weakness is classified under CWE-120, a buffer overflow condition. In this class of flaw an attacker supplies input that exceeds the allocated memory buffer because the code does not enforce proper size checks. The resulting memory corruption can alter program flow or data structures. Specific trigger conditions, packet formats, or affected code paths must be confirmed against the vendor advisory.

Am I affected? How to find it in your systems

• Inventory all D-Link router models deployed on premises or in remote sites; include both managed and consumer-grade devices.
• Check device firmware versions and configuration settings against the vendor advisory, because exact affected releases are not listed in the public summary.
• Look for routers that have reached end-of-life or end-of-service status, as these are explicitly called out by CISA.
• Review network logs and telemetry for anomalous traffic volumes or malformed packets directed at management interfaces, though definitive exploitation indicators require vendor guidance.

How to remediate

Apply the vendor update named in the advisory as the primary step. If the device is end-of-life or end-of-service, discontinue use entirely. For buffer-overflow weaknesses in network appliances, confirm that any remaining devices receive the latest firmware and that unnecessary management services are disabled.

If you can't patch immediately

• Follow the mitigations listed in the vendor advisory or applicable CISA BOD 22-01 guidance for cloud-connected services.
• Segment the affected routers from critical internal networks and restrict management access to trusted administrative hosts only.
• Disable exposed services or features that accept untrusted input until a patch or replacement is in place.
• Monitor logs for signs of unexpected reboots, configuration changes, or traffic anomalies that could indicate attempted exploitation.

If your data may have been exposed

Buffer overflow issues in network devices can lead to unauthorized access and data exposure when exploited. Organizations can run a free exposure scan of their email addresses to check known breach data while they complete device inventory and remediation.