A critical Remote Code Execution (RCE) vulnerability (CVE-2025-9943, CVSS 9.9) has been discovered in the built-in Command Line Interface (CLI) of Jenkins, the world’s most popular automation server. The flaw allows unauthenticated attackers to read arbitrary files and execute commands on the master controller.
Business Impact
Compromising Jenkins is a “game over” scenario for software supply chains. Attackers can inject malicious code into your software products, steal proprietary source code, and exfiltrate production secrets (API keys, cloud credentials) stored within the build environment.
Why It Happened
The vulnerability involves an unsafe argument parsing feature in the Jenkins CLI library (args4j) that is enabled by default. Attackers can manipulate CLI commands to bypass security restrictions.
Recommended Executive Action
Direct DevOps leads to disable the Jenkins CLI immediately if it is not strictly required. Apply the patch released today (Jenkins 2.490+). If patching is delayed, block access to the CLI port at the network firewall level.
Hashtags: #Jenkins #DevOps #SupplyChain #RCE #Vulnerability #CI_CD #CyberSecurity #PatchNow