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HomeTopics 4Network SecurityPatch Now: Critical JetBrains TeamCity On-Premises Flaws Expose Servers to Takeover

Patch Now: Critical JetBrains TeamCity On-Premises Flaws Expose Servers to Takeover


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Attention developers using JetBrains TeamCity On-Premises! A recent discovery of critical security vulnerabilities poses a significant risk of server takeover by malicious actors.

This article details the vulnerabilities, their potential impact, and essential steps to mitigate the threat.

Understanding the JetBrains TeamCity On-Premises Vulnerabilities:

Researchers have identified two critical vulnerabilities (CVE-2024-27198 and CVE-2024-27199) affecting JetBrains TeamCity On-Premises, a popular self-hosted continuous integration and continuous delivery (CI/CD) server solution. These vulnerabilities allow unauthenticated attackers with remote access to potentially gain complete control over vulnerable TeamCity servers.

The Risks of Unpatched Servers:

A successful exploit of these vulnerabilities could have devastating consequences:

  • Server Takeover: Attackers could gain complete administrative control over the TeamCity server, granting them access to sensitive project data, source code, and potentially the ability to deploy malicious code into ongoing builds.
  • Disruption of Development Workflows: A compromised TeamCity server could disrupt development workflows, causing delays and hindering project progress.
  • Lateral Movement: Hackers might leverage compromised TeamCity servers as a foothold to gain access to other systems within the network.

What You Can Do to Stay Protected:

Here are 10 critical actions to safeguard your JetBrains TeamCity On-Premises server:

  1. Patch Immediately: Apply the security patch released by JetBrains (version 2023.11.4) as soon as possible. Delaying the update significantly increases your risk of attack.
  2. Update Regularly: Make a habit of updating TeamCity to the latest version whenever new releases become available.
  3. Minimize Access: Grant access to the TeamCity server only to authorized personnel and implement the principle of least privilege.
  4. Enable Two-Factor Authentication: Enforce two-factor authentication (2FA) for all TeamCity user accounts to add an extra layer of security beyond passwords.
  5. Monitor Network Activity: Continuously monitor network activity for suspicious behavior that might indicate an ongoing attack.
  6. Segment Networks: Implement network segmentation to limit the potential impact of a breach and isolate critical systems.
  7. Maintain Backups: Regularly back up your project data and maintain a comprehensive disaster recovery plan to facilitate swift restoration in case of a cyberattack.
  8. Educate Developers: Train developers on cybersecurity best practices, including secure coding principles and phishing awareness.
  9. Consider Cloud-Based CI/CD Solutions: Evaluate the advantages of cloud-based CI/CD solutions that often come with built-in security features and automatic updates.
  10. Stay Informed: Keep yourself updated on evolving cybersecurity threats and best practices for securing your CI/CD environment.


The critical vulnerabilities in JetBrains TeamCity On-Premises highlight the importance of prioritizing security in your development environment. By implementing the recommended measures, developers and organizations can significantly reduce their attack surface and protect their CI/CD pipelines from exploitation. Remember, a proactive approach to cybersecurity is essential for safeguarding your development projects and maintaining a secure software development lifecycle.

Ouaissou DEMBELE
Ouaissou DEMBELEhttps://cybercory.com
Ouaissou DEMBELE is an accomplished cybersecurity professional and the Editor-In-Chief of cybercory.com. He has over 10 years of experience in the field, with a particular focus on Ethical Hacking, Data Security & GRC. Currently, Ouaissou serves as the Co-founder & Chief Information Security Officer (CISO) at Saintynet, a leading provider of IT solutions and services. In this role, he is responsible for managing the company's cybersecurity strategy, ensuring compliance with relevant regulations, and identifying and mitigating potential threats, as well as helping the company customers for better & long term cybersecurity strategy. Prior to his work at Saintynet, Ouaissou held various positions in the IT industry, including as a consultant. He has also served as a speaker and trainer at industry conferences and events, sharing his expertise and insights with fellow professionals. Ouaissou holds a number of certifications in cybersecurity, including the Cisco Certified Network Professional - Security (CCNP Security) and the Certified Ethical Hacker (CEH), ITIL. With his wealth of experience and knowledge, Ouaissou is a valuable member of the cybercory team and a trusted advisor to clients seeking to enhance their cybersecurity posture.


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