CVE-2026-51701
Unauthenticated remote modification of MAC filter rules on TOTOLINK T6 routers.
Is CVE-2026-51701 being exploited?
Not confirmed. CVE-2026-51701 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-2026-51701?
CVE-2026-51701 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-2026-51701?
Yes. A fix has been recorded for CVE-2026-51701. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-51701 affect?
CVE-2026-51701 affects TOTOLINK T6 firmware 4.1.5cu.748_B20211015 (setMacFilterRules via /cgi-bin/cstecgi.cgi). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-51701?
Apply vendor firmware update immediately and restrict remote admin access.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated attacker can POST to /cgi-bin/cstecgi.cgi setMacFilterRules to change MAC filters, bypass/alter access controls, enable persistent unauthorized access or lock out devices.
Immediate action required