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.

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History

Mon, 24 Aug 2026 21:30:00 +0000

Type Values Removed Values Added
First Time appeared Netis-systems
Netis-systems nc63
Vendors & Products Netis-systems
Netis-systems nc63

Mon, 24 Aug 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


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'}


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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

Updated: 2026-08-24T18:28:08.289Z

cve-icon NVD

Status : Received

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

Modified: 2026-08-24T19:16:58.433

Link: CVE-2026-76070

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-24T21:10:33Z

Weaknesses