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CERT-In warns that many homes, small offices, and service providers in India are at risk from a critical authentication flaw, CVE-2025-59367, found in popular Asus DSL-series WiFi routers. The national cybersecurity agency has issued a security alert regarding this vulnerability.
The CERT-In Vulnerability Note CIVN-2025-0322 warns that remote attackers can access certain router models without user action. The affected routers are the Asus DSL-AC51, DSL-N16, and DSL-AC750, commonly used for DSL internet in homes and small offices.
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CERT-In reports a flaw that allows attackers to bypass login controls and access the router’s admin interface. This can lead to changes in settings, monitoring or redirecting traffic, capturing sensitive information, or compromising connected devices. The agency describes the risks to confidentiality, integrity, and availability as “critical.”
The advisory warns IT and network administrators, SOC analysts, SMB operators, home users, and managed service providers about a widespread vulnerability. CERT-In emphasizes that the CVE-2025-59367 authentication bypass flaw threatens data confidentiality and system integrity.
The report discusses the Asus DSL series, which are modem-router units used in DSL environments. Since these routers act as central hubs, any security breach can compromise all connected devices and data.
The advisory includes a directive: “Apply appropriate security updates as mentioned in: https://www.asus.com/security-advisory.”CERT-In advises users to promptly install firmware patches released by Asus for affected models. They recommend changing default passwords, disabling remote management unless needed, and reviewing router security settings. Users should also monitor router logs for any unusual activity.
Asus has released patches for the CVE-2025-59367 authentication bypass flaw. CERT-In is urging all DSL-series router users to apply these updates right away, emphasizing the vulnerability’s seriousness. Users are advised to check their router settings, update firmware via the Asus security page, and watch for suspicious activity.
