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CVE-2026-73673

HighPublished

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

Published: Aug 14, 2026
Updated: Aug 19, 2026
Assigning CNA: VulnCheck
Evidence observed: Aug 21, 2026

Primary CVSS

8.7/ 10High

cvelist · CVSS 4.0

CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

EPSS probability estimate

0.5%

Low · next 30 days

Percentile: 42.5%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

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.

Sources

CVE-2026-73673PoC
Non-destructive PoC and technical write-up for CVE-2026-73673, an unauthenticated firmware-update flaw in Netis NC63 router, with reproduction and evidence artifacts.

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