Jenkins Remote Code Execution Vulnerability - Active in CISA KEV catalog.
Description
Jenkins Remote Code Execution Vulnerability - Active in CISA KEV catalog.
AI Analyst Comment
Remediation
FEDERAL DEADLINE: October 22, 2025 (21 days). Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. FEDERAL DEADLINE: October 22, 2025 (21 days). Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA KEV Details
Deadline: October 22, 2025
Required Action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
---METADATA---
VENDOR: Jenkins
PRODUCT: Jenkins
AFFECTED_VERSIONS: Jenkins versions 2.56 and earlier, and 2.46.1 LTS and earlier
CONFIDENCE: high
MISSING: none
SOURCES_JSON: [{"url":"https://www.exploit-db.com/exploits/41965/","name":"41965","tags":["exploit","x_refsource_EXPLOIT-DB"]},{"url":"http://www.securityfocus.com/bid/98056","name":"98056","tags":["vdb-entry","x_refsource_BID"]},{"url":"https://www.oracle.com/security-alerts/cpuapr2022.html","name":null,"tags":["x_refsource_MISC"]},{"url":"https://jenkins.io/security/advisory/2017-04-26/","name":null,"tags":["x_refsource_CONFIRM"]},{"url":"http://packetstormsecurity.com/files/159266/Jenkins-2.56-CLI-Deserialization-Code-Execution.html","name":null,"tags":["x_refsource_MISC"]}]
PROFILE: grounded@eead9838b633
MODEL: gemini-3.1-flash-lite
GENERATED: 2026-08-29T14:43:48.001Z
---END_METADATA---
Description Summary:
Jenkins is vulnerable to unauthenticated remote code execution via a Java deserialization flaw in the Jenkins CLI, allowing attackers to bypass blacklist protections using a serialized SignedObject.
Executive Summary:
An unauthenticated remote code execution vulnerability in Jenkins is currently being actively exploited in the wild, posing a critical risk to server integrity and data security.
Vulnerability Details
CVE-ID: CVE-2017-1000353
Affected Software: Jenkins Jenkins
Affected Versions: Jenkins versions 2.56 and earlier, and 2.46.1 LTS and earlier
Vulnerability: The vulnerability allows an unauthenticated attacker to execute arbitrary code by sending a serialized Java SignedObject to the Jenkins CLI. This object bypasses existing blacklist protections during deserialization, enabling full system compromise.
Business Impact
A successful exploit grants an attacker complete control over the Jenkins server, leading to unauthorized access to sensitive build configurations, credentials, and source code repositories. Given the critical CVSS score of 9.5 and the confirmed active exploitation in the wild, this vulnerability represents an immediate threat to operational continuity and organizational data integrity.
Remediation Plan
Immediate Action: Update Jenkins to version 2.57 or 2.46.2 LTS immediately to patch the deserialization flaw.
Proactive Monitoring: Review Jenkins access logs for unusual CLI activity or serialized object patterns, and monitor system processes for unauthorized child executions originating from the Jenkins service account.
Compensating Controls: If immediate patching is not possible, restrict network access to the Jenkins CLI port and disable the remoting-based CLI protocol to reduce the attack surface.
Exploitation Status
Public Exploit Available: Yes, a weaponized exploit exists via a Metasploit module and an Exploit-DB entry (EDB-ID 41965).
Analyst Notes: This vulnerability is confirmed to be actively exploited in the wild as of October 2, 2025. The flaw is highly accessible due to the lack of authentication requirements and the availability of functional exploit code.
Analyst Recommendation
Due to the critical nature of this remote code execution vulnerability and its confirmed status in the CISA Known Exploited Vulnerabilities catalog, remediation must be prioritized above all other maintenance tasks. Administrators should apply the provided security updates immediately to protect their environments from ongoing exploitation attempts.