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Dsl Ac51 FirmwareOperating system · Asus

CVE-2025-59367

CRITICAL · 9.8 CVSS v3.1 Published 2025-11-13
Fix available
A fix is available. Upgrade to 1.1.2.3_1010 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
An authentication bypass vulnerability has been identified in certain DSL series routers, may allow remote attackers to gain unauthorized access into the affected system. Refer to the 'Security Update for DSL Series Router' section on the ASUS Security Advisory for more information.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

This is an authentication bypass vulnerability in ASUS DSL series routers that allows remote attackers to circumvent authentication mechanisms and gain unauthorized administrative access to the affected device without valid credentials.

MitigationApply vendor-supplied firmware updates from ASUS Security Advisory when available; until then, disable remote management interfaces, restrict management access to trusted IP addresses only, and monitor for unauthorized access attempts.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Dsl Ac51 FirmwareOperating system
Affected:< 1.1.2.3_1010
Dsl N16 FirmwareOperating system
Affected:< 1.1.2.3_1010
Dsl Ac750 FirmwareOperating system
Affected:< 1.1.2.3_1010

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify router model and firmware version
    Log into the router web interface or use the command line interface (telnet/ssh if enabled) to locate the System Information or Firmware Version page. Typical paths: Administration > Firmware Upgrade or Status > Device Information.
    Affected if The model is Asus DSL-AC51, DSL-N16, or DSL-AC750 AND the firmware version is earlier than 1.1.2.3_1010.
  2. Verify remote management status
    In the router web interface, navigate to WAN > Remote Management or Administration > System > Remote Access. Check if the remote management or Web Access from WAN feature is enabled.
    Affected if Remote management interfaces are exposed to the WAN (internet), making the device reachable for remote exploitation.
  3. Review administrator accounts
    In the router web interface, go to Administration > Account or User Management. Review the list of configured administrator accounts for any unfamiliar or unauthorized accounts.
    Affected if Unexpected additional administrator accounts exist that were not created by the legitimate administrator.
  4. Check for active admin sessions
    In the router web interface, look for a Status > Active Sessions, System Log, or Connections table. Identify any active administrative sessions from unexpected IP addresses, particularly WAN IP addresses.
    Affected if Active administrative sessions are originating from external IP addresses that the administrator does not recognize.

A defender is affected if they own an Asus DSL-AC51, DSL-N16, or DSL-AC750 router running firmware earlier than 1.1.2.3_1010 AND have remote management enabled or notice unauthorized admin activity.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 1.1.2.3_1010 or later
Fixed in 1.1.2.3_1010
Interim mitigation

Apply vendor-supplied firmware updates from ASUS Security Advisory when available; until then, disable remote management interfaces, restrict management access to trusted IP addresses only, and monitor for unauthorized access attempts.

Recommended fix High confidence

1.1.2.3_1010

  1. 1. Identify your specific ASUS DSL router model (DSL-AC51, DSL-N16, or DSL-AC750)
  2. 2. Navigate to the ASUS support website and locate the firmware download page for your specific model
  3. 3. Download the firmware version 1.1.2.3_1010 or later from the official ASUS support page
  4. 4. Access the router's web administration interface
  5. 5. Navigate to the Administration > Firmware Upgrade section
  6. 6. Upload the downloaded firmware file and wait for the upgrade process to complete
  7. 7. After the router restarts, verify the firmware version has been updated to 1.1.2.3_1010 or later
Caveat Standard firmware upgrade; ensure stable power during the update process

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Dsl Ac51 Firmware Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
18.0 hours of engineering $3,200
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-59367 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data