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A vulnerability in the web-based management interface of Cisco IP Phone 7800 and 8800 Series Phones could allow an unauthenticated, remote attacker to bypass authentication on an affected device. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by sending a crafted request to the web-based management interface. A successful exploit could allow the attacker to access certain parts of the web interface that would normally require authentication.
Use CWE-288, Cisco vendor hub and Ip Phone 7800 Firmware product page to widen CVE-2023-20018 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2018-0325 and CVE-2019-1684 for nearby disclosures in the same product family. Additional editorial context is available in The Weekly Cybersecurity Brief: January 30th, 2026.