CVE-2026-73673
Unauthenticated firmware upload allows persistent compromise of Netis NC63 routers
Is CVE-2026-73673 being exploited?
Not confirmed. CVE-2026-73673 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 0.51% probability of exploitation in the next 30 days.
How severe is CVE-2026-73673?
CVE-2026-73673 is rated High with a CVSS score of 8.7. 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-2026-73673?
Not known from our data. No patch reference has been recorded for CVE-2026-73673, 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-2026-73673 affect?
CVE-2026-73673 affects Netis NC63 router, Firmware v3.0.0.3327, Boa web server / netis.cgi CGI dispatcher. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-73673?
Isolate devices, disable remote/web management, block access, apply vendor firmware update when available.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated multipart POST to /cgi-bin/upload_fw.cgi lets attackers install unsigned firmware, enabling persistent remote compromise and root-level control.
Immediate action required
- affected<= V3.0.0.3327
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.