CVE-2019-0708 (BlueKeep): Zero day vulnerability in Windows Remote Desktop Services

Zero day attack description : In 2019, a critical vulnerability known as CVE-2019-0708, or commonly referred to as BlueKeep, sent shockwaves through the cybersecurity community. BlueKeep affected Microsoft’s Remote Desktop Services (RDS) and posed a significant threat to millions of Windows systems worldwide. In this article, we delve into the technical aspects of BlueKeep, explore its potential impact, and discuss the importance of timely patching and proactive security measures.

BlueKeep was a remote code execution vulnerability found in the Remote Desktop Protocol (RDP) implementation in Windows 7, Windows Server 2008 R2, and older versions of Windows. This vulnerability allowed an attacker to execute arbitrary code remotely without any user interaction, potentially leading to a wormable exploit. This meant that malware leveraging BlueKeep had the potential to spread from one vulnerable system to another automatically, similar to the infamous WannaCry ransomware.

BlueKeep exploited a flaw in the RDP’s “pre-authentication” process, enabling an attacker to send specially crafted packets to the vulnerable system. By exploiting this vulnerability, an attacker could gain unauthorized access and execute arbitrary code with system-level privileges, effectively taking control of the target system.

  1. Wormable Nature: BlueKeep’s wormable nature made it particularly concerning. Once a vulnerable system was compromised, the malware could scan the network for other susceptible systems and propagate itself, potentially leading to a widespread outbreak.
  2. Remote Code Execution: BlueKeep allowed attackers to execute arbitrary code remotely, giving them the ability to install malware, exfiltrate sensitive data, create backdoors, or carry out other malicious activities on the compromised system.

Impact :

BlueKeep posed significant risks to Windows systems, including:

  1. System Compromise: Exploitation of BlueKeep could result in complete compromise of the vulnerable system, granting attackers unauthorized access and control. This could lead to data breaches, system disruption, or even the installation of additional malware.
  2. Network-wide Infection: The wormable nature of BlueKeep meant that a single compromised system could act as a launching pad for spreading the malware across networks, potentially impacting a large number of systems within an organization or even globally.


Microsoft swiftly released security patches to address the BlueKeep vulnerability and mitigate the associated risks. The incident underscored the critical importance of timely patching and proactive security measures:

  1. Patching: Organizations and individual users were strongly advised to apply the available security patches to vulnerable Windows systems as soon as possible. Patching effectively closed the vulnerability and prevented potential exploitation.
  2. Network Segmentation: Implementing network segmentation and isolating vulnerable systems from critical network resources could help contain the spread of BlueKeep and limit the impact of potential exploits.
  3. Endpoint Protection: Deploying robust endpoint protection solutions capable of detecting and blocking BlueKeep-related exploitation attempts was crucial in safeguarding vulnerable systems. Such solutions could identify and prevent unauthorized access attempts targeting the RDP service.
  4. Security Awareness: Educating users about the risks posed by BlueKeep and the importance of patching, strong passwords, and secure remote access practices helped raise awareness and promote responsible security practices.

Take away: BlueKeep represented a significant threat to Windows systems, highlighting the importance of promptly patching vulnerabilities and implementing proactive security measures. The incident served as a wake-up call for organizations and individuals to prioritize the security of their systems, keep software up to date, and remain vigilant against emerging threats. By taking these precautions, we can reduce the risk of exploitation and enhance the overall resilience of our systems in the face of evolving cyber threats.


Disclaimer : The information provided herein is on “as is” basis, without warranty of any kind.