Netis NC63 firmware through V3.0.0.3327 contains a stack-based buffer overflow vulnerability that allows unauthenticated remote attackers to overwrite saved stack state by submitting an oversized Base64-encoded password to the login handler in /bin/netis.cgi. Attackers can exploit the custom Base64 decoder's lack of output length validation against the fixed-size stack buffer to achieve remote code execution with root privileges, as the Boa web server executes the CGI environment as root.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Netis Systems NC63 affected
Version Status Constraints
0 affected ≤ 3.0.0.3327

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Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/ozcanpng/CVE-2026-76070 cve-icon cve-icon
https://ozcanpng.dev/blog/cve-2026-76070-netis-nc63-login-stack-buffer-overflow/ cve-icon cve-icon
https://www.netis-systems.com/products/NC63.html cve-icon cve-icon
https://www.vulncheck.com/advisories/netis-nc63-stack-buffer-overflow-via-login-password-parameter cve-icon cve-icon
History

Mon, 24 Aug 2026 16:00:00 +0000

Type Values Removed Values Added
Description Netis NC63 firmware through V3.0.0.3327 contains a stack-based buffer overflow vulnerability that allows unauthenticated remote attackers to overwrite saved stack state by submitting an oversized Base64-encoded password to the login handler in /bin/netis.cgi. Attackers can exploit the custom Base64 decoder's lack of output length validation against the fixed-size stack buffer to achieve remote code execution with root privileges, as the Boa web server executes the CGI environment as root.
Title Netis NC63 V3.0.0.3327 Stack Buffer Overflow via Login Password Parameter
Weaknesses CWE-121
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-24T18:28:13.077Z

Reserved: 2026-08-18T21:04:48.503Z

Link: CVE-2026-76070

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-24T16:17:22.963

Modified: 2026-08-24T16:17:22.963

Link: CVE-2026-76070

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-24T18:00:04Z

Weaknesses