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CVE-2026-73673— Netis NC63 V3.0.0.3327 Unauthenticated Firmware Update with Missing Cryptographic Firmware Authentication

Quick assessment

Affected
Netis Systems Co., Ltd. Netis NC63 Wireless AC1200 Router
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Netis NC63是中国Netis公司的一款路由器。 Netis NC63 V3.0.0.3327版本存在授权问题漏洞，该漏洞源于Boa Web服务器和netis.cgi CGI分发器缺少身份验证执行机制，可能导致未经身份验证的攻击者提交未签名固件映像并绕过身份验证，造成路由器持久性被攻破。

CVSS 8.8 · High EPSS 0.54% · P44

Affected Version Matrix 1

VendorProduct Version RangeStatus
Netis Systems Co., Ltd. Netis NC63 Wireless AC1200 Router ≤ V3.0.0.3327 affected
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I. Basic Information for CVE-2026-73673

Vulnerability Information
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Vulnerability Title
Netis NC63 V3.0.0.3327 Unauthenticated Firmware Update with Missing Cryptographic Firmware Authentication
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Netis NC63 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Netis NC63是中国Netis公司的一款路由器。 Netis NC63 V3.0.0.3327版本存在授权问题漏洞，该漏洞源于Boa Web服务器和netis.cgi CGI分发器缺少身份验证执行机制，可能导致未经身份验证的攻击者提交未签名固件映像并绕过身份验证，造成路由器持久性被攻破。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Netis Systems Co., Ltd. Netis NC63 Wireless AC1200 Router 0 ~ V3.0.0.3327 -

II. Public POCs for CVE-2026-73673

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 6998 chars
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III. Intelligence Information for CVE-2026-73673

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Vendor Advisories for CVE-2026-73673 (1)

Exploits & Public PoCs for CVE-2026-73673 (1)

Security Blog Posts for CVE-2026-73673 (1)

Vendor Pages for CVE-2026-73673 (3)

IV. Related Vulnerabilities

Same vendor: Netis Systems Co., Ltd.
Same weakness: CWE-306

V. Comments for CVE-2026-73673

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