CVE-2026-51767
Unauthenticated MQTT flaw allows remote reset of pairing and device reboot.
Is CVE-2026-51767 being exploited?
Not confirmed. CVE-2026-51767 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-2026-51767?
CVE-2026-51767 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-2026-51767?
Not known from our data. No patch reference has been recorded for CVE-2026-51767, 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-2026-51767 affect?
CVE-2026-51767 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-2026-51767?
Isolate devices, block MQTT access, and apply vendor firmware when available.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated attacker can send a crafted MQTT message to cs_broker to reset pairing state and force device reboot, enabling persistent DoS and possible unauthorized re-pairing.
Immediate action required