How do I check whether I am affected by CVE-2026-42019?

Open the router admin page, Status/Firmware: version TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327 is affected. Also check whether the web UI answers from the WAN side.

What is the fix for CVE-2026-42019?

No fixed firmware published as of 2026-10-23. Mitigate: turn off WAN/remote management of the admin UI, restrict it to a trusted LAN, change default admin credentials, and check totolink.tw/totolink.net X2000R support pages for new firmware.

Who is not affected by CVE-2026-42019?

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

Live › vulnerability › CVE-2026-42019

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critical9.1Infrastructure

Totolink X2000R router: stack overflow in IPv6 PPPoE setup lets attackers run code

The web management interface (boa, formIpv6Setup) of the Totolink X2000R router has stack-based buffer overflows in its PPPoE settings, triggered through the pppoe_dns1 parameter. An attacker who is logged in to the admin interface can send a crafted HTTP request to run code 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 far4 of 6

missing: primary source, 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 after an authenticated crafted request.
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-2026-42019

Go to dashboard

critical9.1Infrastructure

Totolink X2000R router: stack overflow in IPv6 PPPoE setup lets attackers 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 far4 of 6

missing: primary source, 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 after an authenticated crafted request.
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 IPv6 PPPoE setup lets attackers 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 IPv6 PPPoE setup lets attackers 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