CVE-2026-31847
Remote enablement of Telnet via /goform/setSysTools on Nebula 300+ firmware.
Is CVE-2026-31847 being exploited?
Not confirmed. CVE-2026-31847 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 0.42% probability of exploitation in the next 30 days.
How severe is CVE-2026-31847?
CVE-2026-31847 is rated High with a CVSS score of 8.5. 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-2026-31847?
Not known from our data. No patch reference has been recorded for CVE-2026-31847, 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-2026-31847 affect?
CVE-2026-31847 affects Nexxt Solutions Nebula 300+ router firmware <=12.01.01.37. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-31847?
Disable Telnet; limit remote management; monitor; patch when released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remotely enabling Telnet exposes a privileged diagnostic interface, enabling further device compromise.
Immediate action required
- affected>= <= 12.01.01.37 and <= Nebula300+_v12.01.01.37
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.