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CVE-2025-26677: Remote Desktop Gateway Service Vulnerability Exploitable for Denial of Service Attacks

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Overview

CVE-2025-26677 is a serious vulnerability found in the Remote Desktop Gateway Service that, if exploited, can lead to uncontrolled resource consumption. This vulnerability can be utilized by unauthorized attackers to cause a denial of service over a network. Given the widespread use of Remote Desktop Gateway Service across various industries, this vulnerability possesses a significant threat to businesses and individuals alike, potentially leading to system compromise or data leakage.

Vulnerability Summary

CVE ID: CVE-2025-26677
Severity: High, with a CVSS Score of 7.5
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Denial of service leading to potential system compromise or data leakage

Affected Products

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Product | Affected Versions

Remote Desktop Gateway Service | All versions prior to vendor patch

How the Exploit Works

An unauthorized attacker initiates this exploit by sending a multitude of requests to the Remote Desktop Gateway Service over the network. Due to lack of proper resource control, these requests lead to excessive resource consumption, ultimately causing a denial of service. This can further pave the way for a potential system compromise or data leakage.

Conceptual Example Code

The following is a
conceptual
example of how an attacker might exploit this vulnerability using a flood of network requests:

POST /rdp-gateway/endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "request_payload": "..." }
# Repeat the request multiple times to trigger uncontrolled resource consumption

Mitigation Guidance

To mitigate this vulnerability, it is recommended to apply the vendor patch as soon as it is available. Until then, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) could serve as a temporary mitigation measure by monitoring and limiting the number of incoming requests.

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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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