CVE-2025-20188: Cisco IOS XE WLC RCE Vulnerability

CVE-2025-20188 Overview

A vulnerability in the Out-of-Band Access Point (AP) Image Download, the Clean Air Spectral Recording, and the client debug bundles features of Cisco IOS XE Software for Wireless LAN Controllers (WLCs) could allow an unauthenticated, remote attacker to upload arbitrary files to an affected system.

Critical Impact
An attacker could exploit this vulnerability by sending crafted HTTPS requests to the AP file upload interface, allowing file uploads, path traversal, and command execution with root privileges.

Affected Products

Cisco IOS XE 17.11.1
Cisco IOS XE 17.12.1
Cisco IOS XE 17.12.2

Discovery Timeline

Not Available - Vulnerability discovered by Not Available
Not Available - Responsible disclosure to Cisco
Not Available - CVE CVE-2025-20188 assigned
Not Available - Cisco releases security patch
2025-05-07 - CVE CVE-2025-20188 published to NVD
2025-06-23 - Last updated in NVD database

Technical Details for CVE-2025-20188

Vulnerability Analysis

This vulnerability results from a hard-coded JSON Web Token (JWT) present on an affected system. It allows an attacker to send malicious HTTPS requests to perform path traversal and execute commands as the root user.

Root Cause

Hard-coded credentials and inadequate validation in the file upload interface.

Attack Vector

This is a network-based attack where the attacker sends specially crafted HTTPS requests to the affected system.

bash

# Example exploitation code (sanitized)
curl -X POST \
  --url https://vulnerable-system.example.com/upload \
  --header 'Authorization: Bearer <hardcoded-token>' \
  --form 'file=@/path/to/malicious/file'

Detection Methods for CVE-2025-20188

Indicators of Compromise

Unexpected files in the upload directories
Unusual authentication attempts using JWT
Anomalous command executions

Detection Strategies

Implement network-based intrusion detection systems (NIDS) to monitor for unusual HTTPS requests and JWT usage patterns.

Monitoring Recommendations

Regularly inspect logs for unauthorized file uploads and command execution patterns that deviate from normal behavior.

How to Mitigate CVE-2025-20188

Immediate Actions Required

Block access to file upload endpoints on the affected systems.
Monitor network traffic for suspicious HTTPS requests.
Remove hard-coded JWT from the system configuration.

Patch Information

Apply the security patch released by Cisco as soon as it becomes available. Monitor Cisco’s security advisory page for updates.

Workarounds

For systems where patching is not immediately possible, disable the vulnerable features and modify network configurations to block unauthorized access.