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Cisco IP Phones Exposure of Sensitive Information to an Unauthorized Actor (CVE-2025-20336)

high Tenable OT Security Plugin ID 505007

Synopsis

The remote OT asset is affected by a vulnerability.

Description

A vulnerability in the directory permissions of Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisco Video Phone 8875 could allow an unauthenticated, remote attacker to access sensitive information on an affected device. This vulnerability exists because the product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. An attacker could exploit this vulnerability by sending a crafted packet to the IP address of a device that has Web Access enabled. A successful exploit could allow the attacker to access sensitive information from the device. Note: To exploit this vulnerability, Web Access must be enabled on the phone. Web Access is disabled by default.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.

Solution

Refer to the vendor advisory.

See Also

http://www.nessus.org/u?335db2e6

Plugin Details

Severity: High

ID: 505007

File Name: tenable_ot_cisco_CVE-2025-20336.nasl

Version: 1.3

Type: remote

Family: Tenable.ot

Published: 1/20/2026

Updated: 2/4/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:N/A:N

CVSS Score Source: CVE-2025-20336

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:cisco:ip_phone_8821_firmware, cpe:/o:cisco:ip_phone_7811_firmware, cpe:/o:cisco:ip_phone_7821_firmware, cpe:/o:cisco:ip_phone_7841_firmware, cpe:/o:cisco:ip_phone_7861_firmware, cpe:/o:cisco:ip_phone_8811_firmware, cpe:/o:cisco:ip_phone_8841_firmware, cpe:/o:cisco:ip_phone_8845_firmware, cpe:/o:cisco:ip_phone_8851_firmware, cpe:/o:cisco:ip_phone_8861_firmware, cpe:/o:cisco:ip_phone_8865_firmware, cpe:/o:cisco:ip_phone_7811_firmware:14.3%281%29:sr1, cpe:/o:cisco:ip_phone_7821_firmware:14.3%281%29:sr1, cpe:/o:cisco:ip_phone_7841_firmware:14.3%281%29:sr1, cpe:/o:cisco:ip_phone_7861_firmware:14.3%281%29:sr1, cpe:/o:cisco:ip_phone_8811_firmware:14.3%281%29:sr1, cpe:/o:cisco:ip_phone_8841_firmware:14.3%281%29:sr1, cpe:/o:cisco:ip_phone_8845_firmware:14.3%281%29:sr1, cpe:/o:cisco:ip_phone_8851_firmware:14.3%281%29:sr1, cpe:/o:cisco:ip_phone_8861_firmware:14.3%281%29:sr1, cpe:/o:cisco:ip_phone_8865_firmware:14.3%281%29:sr1, cpe:/o:cisco:ip_phone_7811_firmware:14.3%281%29:-, cpe:/o:cisco:ip_phone_7821_firmware:14.3%281%29:-, cpe:/o:cisco:ip_phone_7841_firmware:14.3%281%29:-, cpe:/o:cisco:ip_phone_7861_firmware:14.3%281%29:-, cpe:/o:cisco:ip_phone_8811_firmware:14.3%281%29:-, cpe:/o:cisco:ip_phone_8841_firmware:14.3%281%29:-, cpe:/o:cisco:ip_phone_8845_firmware:14.3%281%29:-, cpe:/o:cisco:ip_phone_8851_firmware:14.3%281%29:-, cpe:/o:cisco:ip_phone_8851nr_firmware, cpe:/o:cisco:ip_phone_8851nr_firmware:14.3%281%29:-, cpe:/o:cisco:ip_phone_8851nr_firmware:14.3%281%29:sr1, cpe:/o:cisco:ip_phone_8861_firmware:14.3%281%29:-, cpe:/o:cisco:ip_phone_8865_firmware:14.3%281%29:-, cpe:/o:cisco:ip_phone_8821_firmware:11.0%286%29:sr1, cpe:/o:cisco:ip_phone_8821_firmware:11.0%286%29:sr2, cpe:/o:cisco:ip_phone_8821_firmware:11.0%286%29:sr4, cpe:/o:cisco:ip_phone_8821_firmware:11.0%286%29:sr5, cpe:/o:cisco:ip_phone_8821_firmware:11.0%286%29:sr6, cpe:/o:cisco:ip_phone_8821_firmware:11.0%286%29:-

Required KB Items: Tenable.ot/Cisco

Exploit Ease: No known exploits are available

Patch Publication Date: 9/3/2025

Vulnerability Publication Date: 9/3/2025

Reference Information

CVE: CVE-2025-20336

CWE: 200