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Jetbrains Teamcity Vulnerability Under Active Exploitation

March 8, 2024 Reading Time: 3 minutes

Following the recent disclosure on 3rd March 2024, malicious actors wasted no time launching sophisticated attacks targeting two critical vulnerabilities within the popular CI/CD platform, Jetbrains TeamCity. The vulnerabilities relate to authentication bypass which can allow an unauthorised user to perform administrative actions, marking a significant threat to the platform widely utilised for automating software builds, testing, and deployment processes.

Examination of the Vulnerability

Analysis of the Vulnerabilities

A closer examination of CVE-2024-27198, with a CVSS rating of 9.8, allows a severe authentication bypass flaw within TeamCity’s Web component. Discovered by Rapid7 researchers, this vulnerability empowers remote, unauthenticated attackers to execute arbitrary code, seizing total control of impacted instances. CVE-2024-27199 presents a moderate-severity authentication bypass issue in the same component, albeit with less severe implications, allowing for limited information disclosure and system manipulation.

RCE Vulnerability

What are the Implications for TeamCity Users

The announcement of these vulnerabilities has incited considerable anxiety among the 30,000 organisations that depend on TeamCity. Given the platform’s pivotal role in CI/CD environments, the potential for attackers to manipulate software builds and projects for widespread supply chain attacks is a distinct possibility. Security experts highlight the attractiveness of deployment tools like TeamCity to attackers seeking to disseminate malicious code or facilitate lateral movement across networks on an unprecedented scale.

Understanding the Response and Mitigation Efforts

In response to these threats, JetBrains has released updates to mitigate these vulnerabilities, collaborating with agencies like CISA to ensure widespread awareness and patch application. Despite these efforts, the cybersecurity landscape remains fraught with challenges, including reports of ransomware dissemination and unauthorised administrative account creation on vulnerable TeamCity instances. It is strongly advised that all TeamCity users assume a compromised status if operating vulnerable systems and to implement the recommended patches without delay.

The Need for Robust Security Measures

Once again, this is an incident that serves as a stark reminder of the cyber threats facing our digital infrastructure. Organisations leveraging JetBrains TeamCity need to undertake immediate, rigorous actions to safeguard their systems. This includes updating to the latest software versions, diligently monitoring for indications of compromise, and embracing a holistic approach to cybersecurity that encompasses regular vulnerability assessments and adherence to best practices.


The exploitation of vulnerabilities within JetBrains TeamCity highlights a critical threat to the integrity of software development environments, emphasising the paramount importance of vigilant, proactive cybersecurity measures in an era where attackers are continually evolving their tactics. To effectively counteract these threats, companies must not only remain alert but also actively engage in comprehensive vulnerability scanning and penetration testing . Furthermore, leveraging crisis management exercises can provide a way for organisations to test how they can quickly respond to such issues. By adopting these strategies, organisations can enhance their defence against the complex landscape of cyber threats, ensuring a more robust and resilient software development environment.

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