CVE-2025-20158: desk phone 9841 Information Disclosure

Description

A vulnerability in the debug shell of Cisco Video Phone 8875 and Cisco Desk Phone 9800 Series could allow an authenticated, local attacker to access sensitive information on an affected device. To exploit this vulnerability, the attacker must have valid administrative credentials with SSH access on the affected device. SSH access is disabled by default. This vulnerability is due to insufficient validation of user-supplied input by the debug shell of an affected device. An attacker could exploit this vulnerability by sending a crafted SSH client command to the CLI. A successful exploit could allow the attacker to access sensitive information on the underlying operating system.

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CVSS v3.1 Score

4.4

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

Weakness Type (CWE)

CWE-200 CWE-200

Affected Products

Vendor	Product	Versions
cisco	video_phone_8875_firmware	< 3.3\(1\)
cisco	video_phone_8875	All
cisco	desk_phone_9871_firmware	< 3.3\(1\)
cisco	desk_phone_9871	All
cisco	desk_phone_9841_firmware	< 3.3\(1\)
cisco	desk_phone_9841	All
cisco	desk_phone_9851_firmware	< 3.3\(1\)
cisco	desk_phone_9851	All
cisco	desk_phone_9861_firmware	< 3.3\(1\)
cisco	desk_phone_9861	All

References

Advisories & Patches

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-phone-info-disc-YyxsWStK

Frequently Asked Questions

What is CVE-2025-20158? +

A vulnerability in the debug shell of Cisco Video Phone 8875 and Cisco Desk Phone 9800 Series could allow an authenticated, local attacker to access sensitive information on an affected device. To exploit this vulnerability, the attacker must have valid administrative credentials with SSH access on the affected device. SSH access is disabled by default. This vulnerability is due to insufficient validation of user-supplied input by the debug shell of an affected device. An attacker could exploit this vulnerability by sending a crafted SSH client command to the CLI. A successful exploit could allow the attacker to access sensitive information on the underlying operating system. It has a CVSS v3.1 base score of 4.4 (MEDIUM).

How severe is CVE-2025-20158? +

CVE-2025-20158 has a CVSS v3.1 score of 4.4 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-20158? +

CVE-2025-20158 affects products from cisco, specifically: desk_phone_9841, desk_phone_9841_firmware, desk_phone_9851, desk_phone_9851_firmware, desk_phone_9861, desk_phone_9861_firmware, desk_phone_9871, desk_phone_9871_firmware, video_phone_8875, video_phone_8875_firmware. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-20158? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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