CVE-2025-20345

Cisco Duo Authentication Proxy Information Disclosure Vulnerability

Published Aug 20, 2025 CVSS 3.1 · 4.9 Medium EPSS < 1% KEV · Not listed
Description
A vulnerability in the debug logging function of Cisco Duo Authentication Proxy could allow an authenticated, high-privileged, remote attacker to view sensitive information in a system log file.

This vulnerability is due to insufficient masking of sensitive information before it is written to system log files. An attacker could exploit this vulnerability by accessing logs on an affected system. A successful exploit could allow the attacker to view sensitive information that should be restricted.&nbsp;

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2025-25387 A vulnerability in the debug logging function of Cisco Duo Authentication Proxy could allow an authenticated, high-privileged, remote attacker to view sensitive information in a system log file. This vulnerability is due to insufficient masking of sensitive information before it is written to system log files. An attacker could exploit this vulnerability by accessing logs on an affected system. A successful exploit could allow the attacker to view sensitive information that should be restricted.&nbsp;
History
Type Values Removed Values Added
First Time appeared Duo
Duo authentication Proxy
Vendors & Products Duo
Duo authentication Proxy
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description A vulnerability in the debug logging function of Cisco Duo Authentication Proxy could allow an authenticated, high-privileged, remote attacker to view sensitive information in a system log file. This vulnerability is due to insufficient masking of sensitive information before it is written to system log files. An attacker could exploit this vulnerability by accessing logs on an affected system. A successful exploit could allow the attacker to view sensitive information that should be restricted.&nbsp;
Title Cisco Duo Authentication Proxy Information Disclosure Vulnerability
Weaknesses CWE-200
References
Metrics cvssV3_1

{'score': 4.9, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
cisco
Published
Updated
Aug 20, 2025, 6:43 PM
Reserved
Oct 10, 2024, 7:15 PM
Status
Deferred
Published
Aug 20, 2025, 5:15 PM
Modified
Jun 17, 2026, 8:41 AM