CVE-2017-6077: NETGEAR DGN2200 Remote Code Execution Vulnerability

CVE-2017-6077 is a remote code execution vulnerability in the NETGEAR Wireless Router DGN2200. It stems from CWE-78 (OS command injection) and can let an attacker run commands on the device. For IT and security teams, this matters because a compromised edge router can expose the internal network, intercept traffic, or serve as a foothold for further intrusion. Confirm all product and fix details against the vendor advisory.

CISA notes that these routers contain a vulnerability allowing remote code execution and directs organizations to apply updates per vendor instructions. Ransomware use is not documented for this CVE.

How it works

CWE-78 covers improper neutralization of special elements used in an OS command. In products of this class, user-controlled input reaches a shell or system command without adequate validation or escaping. An attacker who can reach the vulnerable interface may supply crafted input that the device interprets as part of a command, leading to arbitrary code execution in the context of the router process.

Public detail on the exact injection point and request format for CVE-2017-6077 is limited in the provided facts. Do not assume specific URLs, parameters, or payloads; treat any unauthenticated or weakly authenticated management or service path on the DGN2200 as in scope until the vendor advisory is reviewed. Successful abuse typically yields control over the device’s operating environment, which can include changing configuration, pivoting to LAN hosts, or altering DNS and routing.

Am I affected? How to find it in your systems

The affected product is the NETGEAR Wireless Router DGN2200. These devices commonly sit at small-office or home-office network edges, providing WAN connectivity, Wi-Fi, and basic NAT/firewall functions. They may still appear in branch offices, labs, or legacy segments even if newer gear is deployed elsewhere.

• Inventory by model: check router admin pages, asset databases, and network discovery for “DGN2200” or NETGEAR consumer/SOHO routers matching that family.
• Confirm firmware and configuration against the vendor advisory; the facts do not list exact vulnerable version ranges, so do not rely on guessed build numbers.
• Scan management interfaces (typically web UI or related services) from both WAN and LAN perspectives where policy allows, and note any devices still reachable from untrusted networks.
• Review logs for unusual admin access, unexpected reboots, configuration changes, or outbound connections initiated by the router itself—common telemetry signs after command-injection abuse on embedded devices. Absence of logs does not prove safety; many consumer routers have limited logging.

How to remediate

Patch first. Apply updates per vendor instructions as directed by CISA. Obtain the correct firmware or replacement guidance only from NETGEAR’s official support channels and verify integrity before install. After upgrading, re-check the device model and firmware string against the advisory to confirm the fix is in place.

• Replace end-of-life units that no longer receive firmware; long-unsupported SOHO routers should not remain on production networks.
• Harden remaining devices: disable remote (WAN-side) administration, change default credentials, restrict management to a dedicated VLAN or jump host, and turn off unused services (WPS, UPnP, telnet, etc.) where the product allows.
• Segment IoT and consumer-grade routers away from sensitive corporate LAN segments so a single compromised edge device cannot reach critical assets.
• Document the change and re-scan to verify the vulnerable service path is no longer exposed.

If you can't patch immediately

Reduce exposure until a vendor-supported fix or hardware replacement is in place.

• Block or restrict WAN access to the router’s management and any non-essential services at the upstream firewall or ISP filter; prefer allow-lists over broad exposure.
• Place the device in a isolated network segment with strict egress filtering so post-exploitation callbacks and lateral movement are limited.
• If a web application firewall or reverse proxy sits in front of any exposed admin path, apply virtual-patch rules that reject anomalous command-like input—tuned for this weakness class, not a substitute for the real firmware update.
• Disable the affected feature or service if the product permits and business use allows; confirm impact in a test window first.
• Increase monitoring: alert on configuration changes, new admin sessions, unexpected DNS or routing alterations, and anomalous traffic sourced from the router. Retain packet captures of management traffic where feasible for later analysis.

If your data may have been exposed

Actively exploited remote-code-execution flaws on edge devices can lead to network compromise and data exposure even when ransomware use is not documented for the specific CVE. If you suspect this router was reachable and unpatched, treat connected systems as potentially at risk: rotate credentials that traversed the device, review outbound flows, and check endpoints for follow-on activity. You can run a free exposure scan of your email addresses against known breach data to see whether associated accounts appear in public breach corpora, then proceed with broader incident response as needed.