CVE-2026-51763
Unauthenticated MQTT message can disconnect wireless clients on TOTOLINK T6
Is CVE-2026-51763 being exploited?
Not confirmed. CVE-2026-51763 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 0.44% probability of exploitation in the next 30 days.
How severe is CVE-2026-51763?
CVE-2026-51763 is rated Critical with a CVSS score of 9.8. 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-2026-51763?
Not known from our data. No patch reference has been recorded for CVE-2026-51763, 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-2026-51763 affect?
CVE-2026-51763 affects TOTOLINK T6 router (firmware 4.1.5cu.748_B20211015), cs_broker component, freeStaClient function. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-51763?
Block MQTT access to routers, isolate affected devices, and apply vendor firmware when released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated remote attacker can send crafted MQTT messages to cs_broker to forcibly disconnect wireless clients (remote DoS/disruption).
Immediate action required