How do I check whether I am affected by CVE-2026-28763?

In the router admin UI (System > Firmware / Status), read the firmware version. Build TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327 is confirmed vulnerable. Other builds are untested, so treat them as possibly affected. Also check whether the admin web interface is reachable from WAN (remote management / port-forwarding of the admin port) and whether the default admin password is still set.

What is the fix for CVE-2026-28763?

No fixed firmware is known. Talos disclosure timeline shows no patch as of 2026-09-15. Mitigate: turn off WAN/remote management, restrict the admin UI to a trusted LAN segment, change default admin credentials, and watch totolink.net for a newer X2000R firmware. Consider replacing the device if no patch ships.

Who is not affected by CVE-2026-28763?

Not affected if: auth-required, not-x2000r, other-firmware-versions, web-admin-disabled.

Live › vulnerability › CVE-2026-28763

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critical9.1Infrastructure

TOTOLINK X2000R router: stack overflow in device hostname handler allows code execution

Stack-based buffer overflow in the boa web server on the TOTOLINK X2000R. formMapDelDevice copies the POST parameter 'hostname' onto a 0x40-byte stack buffer with strcpy, and it only runs when 'hostnameAdd' is non-empty. An authenticated admin session can overwrite the return address and get code execution on the router. Talos found it, and the vendor has not published a fix.

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: Code runs on the router with full device control.
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-2026-28763

Go to dashboard

critical9.1Infrastructure

TOTOLINK X2000R router: stack overflow in device hostname handler allows code execution

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: Code runs on the router with full device control.
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 device hostname handler allows code execution

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 device hostname handler allows code execution

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