CVE-2023-27900

Jenkins 2.393 and earlier, LTS 2.375.3 and earlier, and prior to LTS 2.387.1 is affected by the Apache Commons FileUpload library’s vulnerability CVE-2023-24998. This library is used to process uploaded files via the Stapler web framework (usually through StaplerRequest#getFile) and MultipartFormDataParser in Jenkins.

This allows attackers to cause a denial of service (DoS) by sending crafted requests to HTTP endpoints processing file uploads.

Jenkins 2.394, LTS 2.375.4, and LTS 2.387.1 limits the number of request parts to be processed to 1000. Specific endpoints receiving only simple form submissions have a lower limit.

The application allocates resources such as memory, threads, or file descriptors based on untrusted input without enforcing a cap. Typical impact: resource exhaustion leading to denial of service.

CVE-2023-27900 has a CVSS score of 6.5 (Medium). The vector is network-reachable, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (2.375.4, 2.394, 2.387.1); upgrading removes the vulnerable code path.

Kodem intelligence

1. What is CVE-2023-27900? CVE-2023-27900 is a medium-severity allocation of resources without limits or throttling vulnerability in org.jenkins-ci.main:jenkins-core (maven), affecting versions < 2.375.4. It is fixed in 2.375.4, 2.394, 2.387.1. The application allocates resources such as memory, threads, or file descriptors based on untrusted input without enforcing a cap.
2. How severe is CVE-2023-27900? CVE-2023-27900 has a CVSS score of 6.5 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of org.jenkins-ci.main:jenkins-core are affected by CVE-2023-27900? org.jenkins-ci.main:jenkins-core (maven) versions < 2.375.4 is affected.
4. Is there a fix for CVE-2023-27900? Yes. CVE-2023-27900 is fixed in 2.375.4, 2.394, 2.387.1. Upgrade to this version or later.
5. Is CVE-2023-27900 exploitable, and should I be worried? Whether CVE-2023-27900 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2023-27900 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2023-27900?
   • Upgrade org.jenkins-ci.main:jenkins-core to 2.375.4 or later
   • Upgrade org.jenkins-ci.main:jenkins-core to 2.394 or later
   • Upgrade org.jenkins-ci.main:jenkins-core to 2.387.1 or later

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