CVE-2026-51738
Unauthenticated POST can reset config and reboot TOTOLINK T6 routers via /cgi-bin/cstecgi.cgi
Is CVE-2026-51738 being exploited?
Not confirmed. CVE-2026-51738 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-2026-51738?
CVE-2026-51738 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-2026-51738?
Yes. A fix has been recorded for CVE-2026-51738. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-51738 affect?
CVE-2026-51738 affects TOTOLINK T6 (firmware 4.1.5cu.748_B20211015), HTTP endpoint /cgi-bin/cstecgi.cgi. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-51738?
Apply vendor firmware update; block/limit access to /cgi-bin/cstecgi.cgi and restrict remote management
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated remote reset of device configuration and forced reboot, causing network disruption and loss of custom settings.
Immediate action required