How do I check whether I am affected by CVE-2026-9869?

Open the router admin UI and read the firmware version. Firmware TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327 is confirmed vulnerable, and earlier builds are probably affected too (not confirmed). Also check that the admin interface is not reachable from the WAN, and that the admin password is not the default.

What is the fix for CVE-2026-9869?

No fixed firmware has been published as of 2026-10-23, and the vendor has not responded to Talos. Mitigate instead: turn off WAN remote administration, restrict LAN admin access, set a long unique admin password, and disable TR-069 if unused. Watch totolink.net for new X2000R firmware and install only official images.

Who is not affected by CVE-2026-9869?

Not affected if: admin-not-reachable, different-firmware-version.

Live › vulnerability › CVE-2026-9869

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critical9.1Infrastructure

TOTOLINK X2000R router: crafted request overflows stack and runs code

Stack buffer overflow in the boa web server's formTR069Config handler on the TOTOLINK X2000R router. An authenticated admin sends a long 'password' POST parameter to /boafrm/formTR069Config. The value is saved to flash, then copied into a smaller stack buffer, which gives code execution on the router. Talos found it and disclosed it on 2026-10-20 without a vendor patch. It is one of 30 Talos CVEs against the same firmware build.

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 control of the device and its traffic.
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-2026-9869

Go to dashboard

critical9.1Infrastructure

TOTOLINK X2000R router: crafted request overflows stack and runs 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: Code runs on the router with full control of the device and its traffic.
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 overflows stack and runs code

Why it is critical, and not just CVSS

Who is affected

Know the next one before it finds you.

TOTOLINK X2000R router: crafted request overflows stack and runs 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