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Actively exploited

CVE-2017-1000353 Jenkins Remote Code Execution Vulnerability

Jenkins contains a remote code execution vulnerability. This vulnerability that could allowed attackers to transfer a serialized Java SignedObject object to the remoting-based Jenkins CLI, that would be deserialized using a new ObjectInputStream, bypassing the existing blocklist-based protection mechanism.

From the CISA KEV catalogue version 2026.11.06, with Cybergen analysis. Updated 6 Nov 2026.

Our Assessment

Should You Worry?

Patch nowCybergen assessment
  • CISA confirmed exploitation in the wild and added it to the Known Exploited Vulnerabilities catalogue on 2 Oct 2025.
  • Rated Critical severity (CVSS 9.8, scored by CISA).
  • This product type is often exposed to the internet, which is where attackers scan for it first.
  • It has been in the catalogue for 400 days. Systems still unpatched now have almost certainly been scanned for it.
The Vulnerability

What It Is

Jenkins versions 2.56 and earlier as well as 2.46.1 LTS and earlier are vulnerable to an unauthenticated remote code execution. An unauthenticated remote code execution vulnerability allowed attackers to transfer a serialized Java `SignedObject` object to the Jenkins CLI, that would be deserialized using a new `ObjectInputStream`, bypassing the existing blacklist-based protection mechanism. We're fixing this issue by adding `SignedObject` to the blacklist. We're also backporting the new HTTP CLI protocol from Jenkins 2.54 to LTS 2.46.2, and deprecating the remoting-based (i.e. Java serialization) CLI protocol, disabling it by default.

From Watch to Action

What To Do Now

  1. 1

    Find it

    Search your asset inventory and external attack surface for Jenkins. Include cloud images, appliances and anything a supplier runs for you.

    Attack Surface Management
  2. 2

    Fix it

    Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

    Vulnerability Management
  3. 3

    Hunt for compromise

    If an affected system was reachable before you patched, assume it may have been hit. Check logs, new accounts, web shells and outbound connections from the date of exposure.

    Incident Response
  4. 4

    Prove it is fixed

    Rescan or test the system after patching. Upgrades that fail silently and forgotten secondary instances are common.

    Penetration Testing

Vendor Advisories

Regulation

The Compliance Clock

Cyber EssentialsRated critical, so if it affects devices in your Cyber Essentials scope, the update must be installed within 14 days of the vendor releasing it.NIS2If exploitation causes a significant incident, essential and important entities owe their CSIRT an early warning within 24 hours and a notification within 72 hours.DORAFinancial entities must classify ICT incidents and send an initial notification for a major incident within strict deadlines, with exploited flaws a common cause.US federal (BOD 22-01)Federal civilian agencies had until 23 Oct 2025 to remediate. A sensible benchmark for everyone else.

General guidance, not legal advice. Your obligations depend on your sector, scope and jurisdiction.

Stay Ahead

More Exploited Jenkins Flaws

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CVE-2024-23897 · RansomwareJenkins Command Line Interface (CLI) Path Traversal VulnerabilityAdded 19 Aug 2024CVE-2015-5317Jenkins User Interface (UI) Information Disclosure VulnerabilityAdded 12 May 2023CVE-2019-1003029Jenkins Script Security Plugin Sandbox Bypass VulnerabilityAdded 25 Apr 2022CVE-2019-1003030Jenkins Matrix Project Plugin Remote Code Execution VulnerabilityAdded 25 Mar 2022CVE-2018-1000861Jenkins Stapler Web Framework Deserialization of Untrusted Data VulnerabilityAdded 10 Feb 2022

All 6 exploited Jenkins vulnerabilities

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Evidence

Sources

  1. CISA Known Exploited Vulnerabilities catalogue
  2. NVD: CVE-2017-1000353
  3. CVE record: CVE-2017-1000353
  4. FIRST EPSS
  5. jenkins.io/security/advisory/2017-04-26/
  6. exploit-db.com/exploits/41965/
  7. securityfocus.com/bid/98056
  8. oracle.com/security-alerts/cpuapr2022.html
  9. jenkins.io/security/advisory/2017-04-26/
  10. packetstormsecurity.com/files/159266/Jenkins-2.56-CLI-Deserialization-Code-Execution.html