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D-Link DSL/DIR/DNS Authentication Bypass via DNS Configuration Endpoint

Multiple D-Link DSL/DIR/DNS devices contain an authentication bypass and improper access control vulnerability in the dnscfg.cgi endpoint that allows an unauthenticated attacker to access DNS configuration functionality. By directly requesting this endpoint, an attacker can modify the device’s DNS settings without valid credentials, enabling DNS hijacking (“DNSChanger”) attacks that redirect user traffic to attacker-controlled infrastructure. In 2019, D-Link reported that this behavior was lever

CWE-306CWE-78Jan 5, 2026
CVSS9.3v4.0EPSS0.917%PoCs0SignalsNot listed in CISA KEVNo known ransomware useNo Nuclei templatesSTIX