CVE-2026-31027
Buffer overflow on TOTOlink A3600R allows remote RCE/DoS via rootSsid param.
Is CVE-2026-31027 being exploited?
Not confirmed. CVE-2026-31027 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 0.58% probability of exploitation in the next 30 days.
How severe is CVE-2026-31027?
CVE-2026-31027 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-2026-31027?
Not known from our data. No patch reference has been recorded for CVE-2026-31027, 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-2026-31027 affect?
CVE-2026-31027 affects TOTOlink A3600R v5.9c.4959. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-31027?
Patch when available; disable/restrict the vulnerable interface
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution or denial of service via unvalidated rootSsid length; attacker can take control of the router.
Patch when possible