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Fencer Vulns
high 8.6

CVE-2023-20018 json

A vulnerability in the web-based management interface of Cisco IP Phone 7800 and 8800 Series Phones could allow an unauthenticated, remote…

published 2023-01-19 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-24197

cvss
8.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 50%
public exploits
0
none known

Summary

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.

Patch / fix

  • cisco ip_phone_7800_firmware 14.1\(1\)sr2
  • cisco ip_phone_7811_firmware 14.1\(1\)sr2
  • cisco ip_phone_7821_firmware 14.1\(1\)sr2
  • cisco ip_phone_7832_firmware 14.1\(1\)sr2
  • cisco ip_phone_7841_firmware 14.1\(1\)sr2
  • cisco ip_phone_7861_firmware 14.1\(1\)sr2
  • cisco ip_phone_8800_firmware 14.1\(1\)sr2
  • cisco ip_phone_8811_firmware 14.1\(1\)sr2
  • cisco ip_phone_8821_firmware 14.1\(1\)sr2
  • cisco ip_phone_8821-ex_firmware 14.1\(1\)sr2
  • cisco ip_phone_8831_firmware 14.1\(1\)sr2
  • cisco ip_phone_8832_firmware 14.1\(1\)sr2
  • cisco ip_phone_8841_firmware 14.1\(1\)sr2
  • cisco ip_phone_8845_firmware 14.1\(1\)sr2
  • cisco ip_phone_8851_firmware 14.1\(1\)sr2
  • cisco ip_phone_8861_firmware 14.1\(1\)sr2
  • cisco ip_phone_8865_firmware 14.1\(1\)sr2
  • cisco ip_phones_8832_firmware 14.1\(1\)sr2
  • cisco unified_ip_phone_8851nr_firmware 14.1\(1\)sr2
  • cisco unified_ip_phone_8865nr_firmware 14.1\(1\)sr2

Exploit prediction

0.63% chance of exploitation in the next 30 days, higher than 50% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected products

  • Cisco Cisco Session Initiation Protocol (SIP) Software

Classification

Weakness
  • CWE-288 Authentication Bypass Using an Alternate Path or Channel
  • CWE-863 Incorrect Authorization

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.