CVE-2026-51743
Unauthenticated MQTT message can disable guest Wi‑Fi on TOTOLINK T6.
Is CVE-2026-51743 being exploited?
Not confirmed. CVE-2026-51743 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.36% probability of exploitation in the next 30 days.
How severe is CVE-2026-51743?
CVE-2026-51743 is rated Critical with a CVSS score of 9.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-51743?
Not known from our data. No patch reference has been recorded for CVE-2026-51743, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-51743 affect?
CVE-2026-51743 affects TOTOLINK T6 firmware 4.1.5cu.748_B20211015. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-51743?
Apply vendor firmware when released; block/segment MQTT and management access to routers.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated attacker can disable guest virtual APs via crafted MQTT to cs_broker, causing denial of service and potential lateral access.
Immediate action required