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Uncontrolled Resource ConsumptionWeakness · CWE-400

CVE-2026-36605

MEDIUM · 6.5 CVSS v3.1 Published 2026-06-03
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
70/100
Remediation priority · Elevated
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
Mercusys AC12G (EU) V1 router with firmware AC12G(EU)_V1_200909 is vulnerable to a HTTP denial of service via a low number of crafted incomplete HTTP requests, causing a persistent crash that requires physical power cycling to recover.

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

The Mercusys AC12G V1 router's HTTP server crashes when receiving a small number of malformed incomplete HTTP requests, causing a persistent denial of service that requires physical power cycling to recover. The vulnerability is in the embedded HTTP daemon which fails to handle edge cases in HTTP request parsing.

MitigationApply vendor firmware update when available; until then, isolate the device behind a firewall with rate limiting or consider replacement with a supported device.

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

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
Adjacent
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 device model
    Access the router admin panel or check the device label to confirm it is a Mercusys AC12G V1 router
    Affected if The device is NOT a Mercusys AC12G V1 model
  2. Check firmware version
    Log into the router web interface (typically at 192.168.0.1) and navigate to Status or System settings to view the firmware version, or use the command 'cat /proc/version' via telnet/SSH if available
    Affected if Firmware version matches AC12G(EU)_V1_200909 exactly or falls within the affected range around this version
  3. Verify HTTP service is enabled
    In the router admin panel, check under Advanced or Security settings for HTTP remote management settings, or scan the router's WAN IP on port 80/tcp
    Affected if HTTP service is enabled and accessible (WAN or LAN)
  4. Confirm device accessibility
    Attempt to access the router login page via HTTP on the expected IP address
    Affected if Router web interface is reachable via HTTP, indicating the vulnerable service is running

You are affected if you have a Mercusys AC12G V1 router running firmware version AC12G(EU)_V1_200909 (or a comparable version) with the HTTP service enabled and accessible.

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.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply vendor firmware update when available; until then, isolate the device behind a firewall with rate limiting or consider replacement with a supported device.

Have this fixed Scoped from the published advisory
  • Consultation2.0 h
  • Implementation1.0 h
  • Testing1.0 h
  • Review / QA1.0 h
5.0 hours of engineering $910
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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-2026-36605 in production — separate from our analysis above.

No notes yet

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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
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