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CVE-2026-76071 (GCVE-0-2026-76071)

Vulnerability from nvd – Published: 2026-08-24 15:42 – Updated: 2026-08-26 18:25

Title

Netis NC63 V3.0.0.3327 Stack Buffer Overflow via destHost Parameter

Summary

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 supplying an oversized destHost parameter to the ipFilterList=mod action in netis.cgi. Attackers can exploit widthless sscanf conversions that copy user-supplied input into fixed-size stack buffers before authentication is verified, achieving remote code execution as root due to the Boa web server executing the CGI environment with root privileges.

Severity

9.3 (Critical)


                        
                          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

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-26 18:25 UTC

CWE

CWE-121 - Stack-based Buffer Overflow

Assigner

VulnCheck mitre root

References

4 references

URL	Tags
https://ozcanpng.dev/blog/cve-2026-76071-netis-nc…	technical-descriptionexploit
https://github.com/ozcanpng/CVE-2026-76071	technical-descriptionexploit
https://www.netis-systems.com/products/NC63.html	product
https://www.vulncheck.com/advisories/netis-nc63-s…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
Netis Systems	NC63	Affected: 0 , ≤ 3.0.0.3327 (custom)

Date Public

2026-08-20 00:00

Credits

Özcan Ersan (@ozcanpng)

Show details on NVD website

JSON

To clipboard

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CVE-2026-76070 (GCVE-0-2026-76070)

Vulnerability from nvd – Published: 2026-08-24 15:41 – Updated: 2026-08-24 18:28

Title

Netis NC63 V3.0.0.3327 Stack Buffer Overflow via Login Password Parameter

Summary

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.

Severity

9.3 (Critical)


                        
                          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

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-24 18:28 UTC

CWE

CWE-121 - Stack-based Buffer Overflow

Assigner

VulnCheck mitre root

References

4 references

URL	Tags
https://ozcanpng.dev/blog/cve-2026-76070-netis-nc…	technical-descriptionexploit
https://github.com/ozcanpng/CVE-2026-76070	technical-descriptionexploit
https://www.netis-systems.com/products/NC63.html	product
https://www.vulncheck.com/advisories/netis-nc63-s…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
Netis Systems	NC63	Affected: 0 , ≤ 3.0.0.3327 (custom)

Date Public

2026-08-20 00:00

Credits

Özcan Ersan (@ozcanpng)

Show details on NVD website

JSON

To clipboard

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CVE-2026-76071 (GCVE-0-2026-76071)

Vulnerability from cvelistv5 – Published: 2026-08-24 15:42 – Updated: 2026-08-26 18:25

Title

Netis NC63 V3.0.0.3327 Stack Buffer Overflow via destHost Parameter

Summary

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 supplying an oversized destHost parameter to the ipFilterList=mod action in netis.cgi. Attackers can exploit widthless sscanf conversions that copy user-supplied input into fixed-size stack buffers before authentication is verified, achieving remote code execution as root due to the Boa web server executing the CGI environment with root privileges.

Severity

9.3 (Critical)


                        
                          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

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-26 18:25 UTC

CWE

CWE-121 - Stack-based Buffer Overflow

Assigner

VulnCheck mitre root

References

4 references

URL	Tags
https://ozcanpng.dev/blog/cve-2026-76071-netis-nc…	technical-descriptionexploit
https://github.com/ozcanpng/CVE-2026-76071	technical-descriptionexploit
https://www.netis-systems.com/products/NC63.html	product
https://www.vulncheck.com/advisories/netis-nc63-s…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
Netis Systems	NC63	Affected: 0 , ≤ 3.0.0.3327 (custom)

Date Public

2026-08-20 00:00

Credits

Özcan Ersan (@ozcanpng)

Show details on NVD website

JSON

To clipboard

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CVE-2026-76070 (GCVE-0-2026-76070)

Vulnerability from cvelistv5 – Published: 2026-08-24 15:41 – Updated: 2026-08-24 18:28

Title

Netis NC63 V3.0.0.3327 Stack Buffer Overflow via Login Password Parameter

Summary

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.

Severity

9.3 (Critical)


                        
                          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

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-24 18:28 UTC

CWE

CWE-121 - Stack-based Buffer Overflow

Assigner

VulnCheck mitre root

References

4 references

URL	Tags
https://ozcanpng.dev/blog/cve-2026-76070-netis-nc…	technical-descriptionexploit
https://github.com/ozcanpng/CVE-2026-76070	technical-descriptionexploit
https://www.netis-systems.com/products/NC63.html	product
https://www.vulncheck.com/advisories/netis-nc63-s…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
Netis Systems	NC63	Affected: 0 , ≤ 3.0.0.3327 (custom)

Date Public

2026-08-20 00:00

Credits

Özcan Ersan (@ozcanpng)

Show details on NVD website

JSON

To clipboard

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4 vulnerabilities found for NC63 by Netis Systems

CVE-2026-76071 (GCVE-0-2026-76071)

CVE-2026-76070 (GCVE-0-2026-76070)

CVE-2026-76071 (GCVE-0-2026-76071)

CVE-2026-76070 (GCVE-0-2026-76070)

Find a vulnerability

Search criteria ⓘ Use this form to refine search results. Full-text search supports keyword queries with ranking and filtering. You can combine vendor, product, and sources to narrow results. Enable “Apply ordering” to sort by date instead of relevance.

4 vulnerabilities found for NC63 by Netis Systems

CVE-2026-76071 (GCVE-0-2026-76071)

CVE-2026-76070 (GCVE-0-2026-76070)

CVE-2026-76071 (GCVE-0-2026-76071)

CVE-2026-76070 (GCVE-0-2026-76070)

Search criteria ⓘ Use this form to refine search results.
Full-text search supports keyword queries with ranking and filtering.
You can combine vendor, product, and sources to narrow results.
Enable “Apply ordering” to sort by date instead of relevance.