How do I check whether I am affected by CVE-2026-10139?

Open the router admin page (Status/System info) and read the firmware version. TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327 is confirmed vulnerable. Also check whether the admin web UI (port 80/boa) is reachable from WAN or untrusted LAN/guest networks.

What is the fix for CVE-2026-10139?

No fixed firmware published in the sources; unknown. Check totolink.net X2000R product page for newer firmware. Until then: disable WAN/remote management, use a strong unique admin password, keep the admin UI off guest and IoT networks.

Who is not affected by CVE-2026-10139?

Not affected if: auth-required, no-wan-admin.

Live › vulnerability › CVE-2026-10139

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critical9.1Infrastructure

TOTOLINK X2000R router: stack overflow in Mcli lets an attacker run code

Authenticated stack overflow in the Mcli helper binary of TOTOLINK X2000R firmware B20250421.1327. In formUpload, attacker-supplied devicemac%d POST parameters (mesh upgrade mode) are put into a system() command line for Mcli, which strcpy's them into 0x12-byte stack buffers. An admin-level session can get code execution as root. CVSS 9.1 (Talos), PR:H.

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 code on the router after logging in.
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-2026-10139

Go to dashboard

critical9.1Infrastructure

TOTOLINK X2000R router: stack overflow in Mcli lets an attacker run code

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 code on the router after logging in.
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: stack overflow in Mcli lets an attacker run code

Why it is critical, and not just CVSS

Who is affected

Know the next one before it finds you.

TOTOLINK X2000R router: stack overflow in Mcli lets an attacker run code

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