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CVE-2025-27066: Transient Denial Of Service Vulnerability in ANQP Message Processing

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Overview

The CVE-2025-27066 is a critical vulnerability, affecting systems that process ANQP (Access Network Query Protocol) messages. The vulnerability can lead to a transient Denial of Service (DoS) and potentially system compromise or data leakage. Given the severity of this vulnerability, it is crucial for organizations to understand and mitigate the risk it presents.

Vulnerability Summary

CVE ID: CVE-2025-27066
Severity: Critical (7.5 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Transient DoS, with potential for system compromise and data leakage.

Affected Products

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Product | Affected Versions

ANQP Message Processor | All current versions

How the Exploit Works

The exploit takes advantage of a flaw in how ANQP messages are processed. An attacker sends a specifically crafted ANQP message to a targeted system. This malformed message causes the system to enter a transient DoS state while it struggles to process the message. During this time, the system may be vulnerable to additional attacks that could lead to system compromise or data leakage.

Conceptual Example Code

Here’s a conceptual example of how the vulnerability might be exploited. This could be a malicious ANQP message:

POST /ANQP/Processor HTTP/1.1
Host: target.example.com
Content-Type: application/anqp-msg
{ "malicious_payload": "specially_crafted_message_that_causes_DoS" }

Mitigation

To mitigate this vulnerability, it is advised to apply the vendor patch as soon as it is available. In the meantime, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as temporary mitigation, helping to filter out malicious ANQP messages. It is also recommended to monitor system logs for any unusual activity or performance degradation, which could indicate an attempted exploit of this vulnerability.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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