CVE-2026-51717
Unauthenticated remote change of TOTOLINK T6 operating mode via crafted POST.
Is CVE-2026-51717 being exploited?
Not confirmed. CVE-2026-51717 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 0.29% probability of exploitation in the next 30 days.
How severe is CVE-2026-51717?
CVE-2026-51717 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-2026-51717?
Yes. A fix has been recorded for CVE-2026-51717. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-51717 affect?
CVE-2026-51717 affects TOTOLINK T6 (firmware 4.1.5cu.748_B20211015), TOTOLINK T6 routers. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-51717?
Apply vendor firmware update and block access to /cgi-bin/cstecgi.cgi
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated attacker can change device operating mode remotely via /cgi-bin/cstecgi.cgi, enabling misconfiguration, network disruption, or persistent access.
Immediate action required