How do I check whether I am affected by CVE-2026-40627?

In the router web UI (status/system page) read the firmware version; affected if it is TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327. Check whether the admin web server (boa, ports 80/8080) answers from the WAN side.

What is the fix for CVE-2026-40627?

No fixed firmware published as of 2026-10-23 (unknown); check totolink.net downloads for X2000R. Mitigate: turn off remote/WAN management, limit admin UI to trusted LAN, replace the default admin password (exploit needs a valid login).

Who is not affected by CVE-2026-40627?

Not affected if: auth-required, other-firmware, remote-management-disabled.

Live › vulnerability › CVE-2026-40627

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critical9.1Infrastructure

Totolink X2000R router: crafted request runs OS commands as attacker

The boa web server's formWsc handler on Totolink X2000R routers passes the targetAPSsid parameter to a system shell without sanitising it. An attacker who holds a valid login can send a crafted HTTP request and run arbitrary commands on the router.

Summary written from the sources below. Check the originals before acting.

CVSS 3.x

9.1

critical

scored by [email protected]

known so far5 of 6

missing: exploitation

First public: Oct 20, 2026 UTC
Last modified: Oct 23, 2026
Status: open
Known exploitation: None reported
Public exploit: None on GitHub
EPSS: not scored

First seen by InfraStack 2026-10-23 21:57 UTC. All times on this page are UTC.

Why it is critical, and not just CVSS

Likelihood → · Impact ↓

critical

high

medium

high

medium

low

medium

low

Exploited: No reports yet.
Needs login: Yes.
Needs a special setup: Not known from the sources.
Reachable from: network.
Worst case: Attacker runs commands as root on the router and takes over the device.
CVSS said: 9.1. The facts above say medium; we keep the sources' critical until an analyst looks.

Who is affected

1 product

Know the next one before it finds you.

Add to Slack

Live › vulnerability › CVE-2026-40627

Go to dashboard

critical9.1Infrastructure

Totolink X2000R router: crafted request runs OS commands as attacker

Summary written from the sources below. Check the originals before acting.

CVSS 3.x

9.1

critical

scored by [email protected]

known so far5 of 6

missing: exploitation

First public: Oct 20, 2026 UTC
Last modified: Oct 23, 2026
Status: open
Known exploitation: None reported
Public exploit: None on GitHub
EPSS: not scored

First seen by InfraStack 2026-10-23 21:57 UTC. All times on this page are UTC.

Why it is critical, and not just CVSS

Likelihood → · Impact ↓

critical

high

medium

high

medium

low

medium

low

Exploited: No reports yet.
Needs login: Yes.
Needs a special setup: Not known from the sources.
Reachable from: network.
Worst case: Attacker runs commands as root on the router and takes over the device.
CVSS said: 9.1. The facts above say medium; we keep the sources' critical until an analyst looks.

Who is affected

1 product

Know the next one before it finds you.

Add to Slack

Totolink X2000R router: crafted request runs OS commands as attacker

Why it is critical, and not just CVSS

Who is affected

Know the next one before it finds you.

Totolink X2000R router: crafted request runs OS commands as attacker

Why it is critical, and not just CVSS

Who is affected

Know the next one before it finds you.

How to check

The fix

Who had it, and when

What the sources say, verbatim

Sources