Vulnerability-Lookup

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	CPE status
Netis Systems	NC63	Affected: 0 , ≤ 3.0.0.3327 (custom)	guessed

Date Public

2026-08-20 00:00

Credits

Özcan Ersan (@ozcanpng)

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-76071

Vulnerability from fkie_nvd - Published: 2026-08-24 16:17 - Updated: 2026-08-26 19:17

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/ozcanpng/CVE-2026-76071
	disclosure@vulncheck.com	https://ozcanpng.dev/blog/cve-2026-76071-netis-nc63-ipfilter-stack-buffer-overflow/
	disclosure@vulncheck.com	https://www.netis-systems.com/products/NC63.html
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/netis-nc63-stack-buffer-overflow-via-desthost-parameter

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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          "defaultStatus": "affected",
          "product": "NC63",
          "vendor": "Netis Systems",
          "versions": [
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  "lastModified": "2026-08-26T19:17:04.430",
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          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
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          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
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          "options": [
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    },
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}

GHSA-MX2Q-89WP-JRVH

Vulnerability from github – Published: 2026-08-24 18:31 – Updated: 2026-08-24 18:31

Details

Severity

9.8 (Critical)


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

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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-76071"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-121"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-24T16:17:23Z",
    "severity": "CRITICAL"
  },
  "details": "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.",
  "id": "GHSA-mx2q-89wp-jrvh",
  "modified": "2026-08-24T18:31:51Z",
  "published": "2026-08-24T18:31:51Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-76071"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ozcanpng/CVE-2026-76071"
    },
    {
      "type": "WEB",
      "url": "https://ozcanpng.dev/blog/cve-2026-76071-netis-nc63-ipfilter-stack-buffer-overflow"
    },
    {
      "type": "WEB",
      "url": "https://www.netis-systems.com/products/NC63.html"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/netis-nc63-stack-buffer-overflow-via-desthost-parameter"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

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

FKIE_CVE-2026-76071

GHSA-MX2Q-89WP-JRVH

Tags

Sightings

Nomenclature