How do I check whether I am affected by CVE-2026-35499?

Open the router admin page, go to system info/firmware, and compare with TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327; that build is the only one confirmed vulnerable. Also check whether the admin web UI is reachable from WAN (remote management enabled, or a port forward to the router's web port) from outside your network.

What is the fix for CVE-2026-35499?

No fixed firmware known as of 2026-10-23. Mitigate: disable WAN/remote management, restrict the admin UI to a trusted LAN host, change the default admin password, and check totolink.net for newer X2000R firmware. Consider replacing the device if no patch ships.

Who is not affected by CVE-2026-35499?

Not affected if: auth-required, different-firmware-version, managed-hosting, no-web-admin-exposed.

Live › vulnerability › CVE-2026-35499

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critical9.1Infrastructure

Totolink X2000R router: crafted request runs OS commands via formWsc

Totolink X2000R firmware B20250421.1327 has an OS command injection in the boa web server's /boafrm/formWsc handler. The peerRptPin POST parameter (used when setRptPIN is set and setPIN is empty) is put into a system() call unescaped, so a logged-in admin session can run any command as the router's OS user. CVSS 9.1 (PR:H). Found by Cisco Talos. The vendor acknowledged the report in June 2026, and no fixed firmware has been published.

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 arbitrary code as root on the router.
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-2026-35499

Go to dashboard

critical9.1Infrastructure

Totolink X2000R router: crafted request runs OS commands via formWsc

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 arbitrary code as root on the router.
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 via formWsc

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 via formWsc

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