CVE-2026-0410: Netgear Router Firmware Integrity Vulnerability

Technical summary

This vulnerability stems from inadequate input validation (CWE-20) in Netgear router firmware. An authenticated administrator on the local network can bypass access controls to elevate privileges and make unauthorized modifications to router software and configuration. The attack vector is adjacent (local network only), requires high privilege credentials to initiate, and does not require user interaction. The impact is integrity-focused: an attacker can alter router firmware and functionality, but cannot exfiltrate confidential data or cause denial of service through this flaw alone.

Business impact

Compromise of a router's firmware integrity can lead to persistent network-level attacks, including man-in-the-middle interception, DNS hijacking, credential theft, and lateral movement into connected systems. In enterprise environments, compromised routers become trusted infrastructure for launching supply-chain attacks. For service providers managing multiple customer routers, this vulnerability could enable unauthorized network modifications affecting multiple downstream organizations. The ability to modify firmware means an attacker can persist even after administrative password changes.

Affected systems

Netgear's R7000 and RAX-series (RAX20, RAX35V2, RAX41, RAX41V2, RAX42, RAX42V2, RAX43, RAX43V2, RAX45, RAX49S, RAX50, RAX50S, RAX50V2, RAX54SV2), RAXE-series (RAXE450, RAXE500), and XR1000/XR1000V2 routers are affected across both devices and their firmware versions. This spans entry-level to high-end consumer and prosumer WiFi 6 platforms released over multiple years, indicating a systemic issue rather than an isolated flaw. Administrators should check Netgear's advisory to identify which specific firmware versions on these models require patching.

Exploitability

Exploitation is straightforward once an attacker holds valid admin credentials and has local network access. No complex exploitation chain, special software, or user interaction is needed. However, the practical barrier is high: the attacker must already be authenticated and on the network. This vulnerability is not exploitable from the internet remotely. It is most relevant in scenarios involving insider threats, credential compromise of administrative accounts, or physical access to the local network by an attacker. The vulnerability has not been added to the CISA KEV catalog, indicating no evidence of active exploitation in the wild at publication time.

Remediation

Netgear has released firmware patches for affected models. Organizations should obtain and deploy the latest firmware versions from Netgear's support portal, verifying the specific version numbers for each router model in their inventory. Firmware updates typically require administrative access and should be scheduled during maintenance windows. Beyond patching, restrict administrative access to trusted personnel and networks, use strong unique passwords, disable remote management if not required, and consider network segmentation to limit the lateral impact of any compromised router.

Patch guidance

Contact Netgear support or check the product support pages for R7000, RAX-series, RAXE-series, and XR1000 models to obtain patched firmware versions. Verify patch availability for your exact model and current firmware version before scheduling updates. Test patches in a non-production environment if possible. After patching, reboot the router and confirm that administrative functions and network connectivity remain intact. Document the patching activity for compliance and audit records.

Detection guidance

Monitor router logs for unauthorized administrative actions, particularly firmware modifications or configuration changes initiated outside normal maintenance windows. Inspect router firmware checksums and version information regularly using automated inventory tools. Network sensors should flag unexpected admin-to-router traffic from unusual IP addresses on the local network. Intrusion detection systems should be tuned to detect abnormal router API or management interface activity. Compare current firmware versions in production against vendor advisories to identify unpatched devices.

Why prioritize this

Although the CVSS score of 4.5 (MEDIUM) is modest, the ability to permanently alter router firmware poses a unique risk: an attacker gains persistence, maintains control across reboots, and can conduct network-level attacks on all connected devices. The broad range of affected Netgear models increases the likelihood that many organizations have vulnerable devices in production. Patch availability mitigates the risk, but the high friction of router firmware updates means many devices may remain unpatched for months. Organizations with routers exposed to untrusted local networks or with weak administrative credential hygiene should prioritize this patch.

Risk score, explained

The CVSS 3.1 score of 4.5 reflects the requirement for authenticated access and local network proximity, which constrains the attack surface. However, the integrity impact (firmware modification) is high, and the attack is simple to execute once preconditions are met. The score does not fully capture the persistent, network-wide harm that firmware compromise can inflict. Organizations managing many routers or with interior threats should treat this as higher priority than the numeric score suggests.

Frequently asked questions