CVE-2019-25249Public exploitNetwork attack vector

Passwordless root access via unchecked configuration writes

Published Dec 24, 2025 · Updated Dec 24, 2025

Authentication bypass in dLAN 550 duo+ Starter Kit firmware 3.1.0-1 allows remote attackers to gain passwordless root access. The htmlmgr CGI script accepts unvalidated system-configuration keys, including hidden Telnetd, shell, and reboot parameters. Network access to the web interface suffices; rebooting activates the services, after which the root account accepts a login without a password.

CVSS severity9.8
Critical
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in dLAN 550 duo+ Starter Kit firmware 3.1.0-1 allows remote attackers to gain passwordless root access. The htmlmgr CGI script accepts unvalidated system-configuration keys, including hidden Telnetd, shell, and reboot parameters. Network access to the web interface suffices; rebooting activates the services, after which the root account accepts a login without a password.

The record

CVE
CVE-2019-25249
Published
Dec 24, 2025
Updated
Dec 24, 2025
Vendor
devolo
Product
dLAN 550 duo+
Classifications
CWE-266, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 24, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=500 AV Wireless+ 3.1.0-1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

devolo · dLAN 550 duo+version=500 AV Wireless+ 3.1.0-1

Published CVSS scores

9.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-266Incorrect Privilege Assignment
T1210Exploitation of Remote Services

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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