CVE intelligence and bounded remediation

CVE-2023-20018 — Cisco Ip Phone 7800 Firmware security vulnerability

High CVSS 8.6

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.

Severity
High
CVSS
8.6 (3.1)
Published
2023-01-20
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-288, CWE-863

Affected products

  • cisco / ip_phone_7800_firmware
  • cisco / ip_phone_7811_firmware
  • cisco / ip_phone_7821_firmware
  • cisco / ip_phone_7832_firmware
  • cisco / ip_phone_7841_firmware
  • cisco / ip_phone_7861_firmware

Showing 6 representative product identities from 22 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Authentication bypass and missing authentication

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Check exposure

  • Map every affected endpoint and protocol path, including alternate ports, legacy routes, recovery flows, service accounts, and machine-to-machine access.
  • Confirm which deployments enable the affected authentication mode and whether the interface is reachable from untrusted networks.
  • Review session, token, credential, and proxy trust configuration without attempting account takeover.

Remediate safely

  • Apply the supported fix and centralize fail-closed authentication before protected request handling.
  • Remove default or embedded credentials, rotate affected secrets and sessions, and bind authentication decisions to the intended audience and channel.
  • Add negative tests for alternate routes, malformed or absent credentials, recovery flows, and proxy-derived identity.

Authoritative sources

Complete CVE record and remediation plan

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