CVE-2023-20018

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.

Published: 2023-01-20 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-20018 is rated Moderate Risk (50.2/100): CVSS High severity, with low exploitation likelihood (EPSS 0.61%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2023-20018

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.38% 0.61% +0.23%
2 2026-03-12 0.46% 0.38% -0.08%
3 2026-02-01 — 0.46% —

Full EPSS history (8 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-20018

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.6 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 4.7 [email protected]
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 2.5 [email protected]

Weakness enumeration for CVE-2023-20018

Affected software / configurations for CVE-2023-20018

Vendor Product Version Raw CPE
cisco ip_phone_7800_firmware < 14.1\(1\)sr2 cpe:2.3:o:cisco:ip_phone_7800_firmware:*:*:*:*:*:*:*:*
cisco ip_phone_7811_firmware < 14.1\(1\)sr2 cpe:2.3:o:cisco:ip_phone_7811_firmware:*:*:*:*:*:*:*:*
cisco ip_phone_7821_firmware < 14.1\(1\)sr2 cpe:2.3:o:cisco:ip_phone_7821_firmware:*:*:*:*:*:*:*:*
cisco ip_phone_7832_firmware < 14.1\(1\)sr2 cpe:2.3:o:cisco:ip_phone_7832_firmware:*:*:*:*:*:*:*:*
cisco ip_phone_7841_firmware < 14.1\(1\)sr2 cpe:2.3:o:cisco:ip_phone_7841_firmware:*:*:*:*:*:*:*:*
cisco ip_phone_7861_firmware < 14.1\(1\)sr2 cpe:2.3:o:cisco:ip_phone_7861_firmware:*:*:*:*:*:*:*:*
cisco ip_phone_8800_firmware < 14.1\(1\)sr2 cpe:2.3:o:cisco:ip_phone_8800_firmware:*:*:*:*:*:*:*:*
cisco ip_phone_8811_firmware < 14.1\(1\)sr2 cpe:2.3:o:cisco:ip_phone_8811_firmware:*:*:*:*:*:*:*:*
cisco ip_phone_8821_firmware < 14.1\(1\)sr2 cpe:2.3:o:cisco:ip_phone_8821_firmware:*:*:*:*:*:*:*:*
cisco ip_phone_8821-ex_firmware < 14.1\(1\)sr2 cpe:2.3:o:cisco:ip_phone_8821-ex_firmware:*:*:*:*:*:*:*:*
cisco ip_phone_8831_firmware < 14.1\(1\)sr2 cpe:2.3:o:cisco:ip_phone_8831_firmware:*:*:*:*:*:*:*:*
cisco ip_phone_8832_firmware < 14.1\(1\)sr2 cpe:2.3:o:cisco:ip_phone_8832_firmware:*:*:*:*:*:*:*:*
cisco ip_phone_8841_firmware < 14.1\(1\)sr2 cpe:2.3:o:cisco:ip_phone_8841_firmware:*:*:*:*:*:*:*:*
cisco ip_phone_8845_firmware < 14.1\(1\)sr2 cpe:2.3:o:cisco:ip_phone_8845_firmware:*:*:*:*:*:*:*:*
cisco ip_phone_8851_firmware < 14.1\(1\)sr2 cpe:2.3:o:cisco:ip_phone_8851_firmware:*:*:*:*:*:*:*:*
cisco ip_phone_8861_firmware < 14.1\(1\)sr2 cpe:2.3:o:cisco:ip_phone_8861_firmware:*:*:*:*:*:*:*:*
cisco ip_phone_8865_firmware < 14.1\(1\)sr2 cpe:2.3:o:cisco:ip_phone_8865_firmware:*:*:*:*:*:*:*:*
cisco ip_phones_8832_firmware < 14.1\(1\)sr2 cpe:2.3:o:cisco:ip_phones_8832_firmware:*:*:*:*:*:*:*:*
cisco unified_ip_phone_8851nr_firmware < 14.1\(1\)sr2 cpe:2.3:o:cisco:unified_ip_phone_8851nr_firmware:*:*:*:*:*:*:*:*
cisco unified_ip_phone_8865nr_firmware < 14.1\(1\)sr2 cpe:2.3:o:cisco:unified_ip_phone_8865nr_firmware:*:*:*:*:*:*:*:*
cisco wireless_ip_phone_8821_firmware < 11.0\(6\)sr4 cpe:2.3:o:cisco:wireless_ip_phone_8821_firmware:*:*:*:*:*:*:*:*
cisco wireless_ip_phone_8821-ex_firmware < 11.0\(6\)sr4 cpe:2.3:o:cisco:wireless_ip_phone_8821-ex_firmware:*:*:*:*:*:*:*:*

References for CVE-2023-20018

cvelogic Threat Intelligence