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TI-2026-51756 Aliases CVE-2026-73673GHSA-mqjf-hpmj-9gr8

Netis NC63 V3.0.0.3327 Unauthenticated Firmware Update with Missing Cryptographic Firmware Authentication

Priority MEDIUM 40CWE-306Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-306.

Summary

Netis NC63 router firmware V3.0.0.3327 contains an unauthenticated firmware update vulnerability that allows unauthenticated attackers to submit unsigned firmware images by exploiting a missing authentication enforcement flaw in the Boa web server and netis.cgi CGI dispatcher. Attackers can send a multipart POST request to /cgi-bin/upload_fw.cgi without a valid session cookie, bypassing authentication because Boa grants access to any path containing '.cgi' regardless of cookie validation, and netis.cgi reads but does not enforce the authentication state before invoking the firmware update handler, which accepts images validated only by a forgeable additive checksum and static product strings rather than a cryptographic signature, potentially enabling persistent router compromise.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00543 45th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
NetisNetis NC63 Wireless AC1200 Routerup to V3.0.0.3327—No fix listedCNA
  • Netis NC63 Wireless AC1200 Router VendorNetis Affected up to V3.0.0.3327 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-73673
  2. 2026-10-03 Alias added: GHSA-mqjf-hpmj-9gr8

References

Other 4

  • TI-2019-13967 Netis WF2419 is vulnerable to authenticated Remote Code Execution (RCE) as root through… KEVCVSS 3.1HIGH 7.5
  • TI-2024-15118 NETIS SYSTEMS MW5360 V1.0.1.3031 was discovered to contain a command injection… CVSS 3.1CRITICAL 9.8
  • TI-2024-16976 Netis WF2780 v2.1.40144 was discovered to contain a command injection vulnerability via the wps_ap_ssid5g parameter CVSS 3.1CRITICAL 9.8
  • TI-2023-24351 Netis N3Mv2-V1.0.1.865 was discovered to contain a command injection vulnerability via… CVSS 3.1CRITICAL 9.8
  • TI-2023-24350 Netis N3Mv2-V1.0.1.865 was discovered to contain a command injection vulnerability via… CVSS 3.1CRITICAL 9.8
  • TI-2023-24349 Netis N3Mv2-V1.0.1.865 was discovered to contain a command injection vulnerability via… CVSS 3.1CRITICAL 9.8
See all 67 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences