CVE-2026-76071

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-24. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this weekElevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
62%
KEV
Not listed

Published

August 24, 2026

Last Modified

August 26, 2026

Advisory Details (4)

Auto-updated Aug 26, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

Netis NC63 V3.0.0.3327 Stack Buffer Overflow via destHost Parameter | Advisories | VulnCheck

https://www.vulncheck.com/advisories/netis-nc63-stack-buffer-overflow-via-desthost-parameter
generic

NC63

https://www.netis-systems.com/products/NC63.html
generic🟡 PoC Available

CVE-2026-76071: Unauthenticated Pre-Auth Stack Buffer Overflow via sscanf %[^,] in skk_set.cgi ipFilterList Handler in Netis NC63 - ozcanpng

https://ozcanpng.dev/blog/cve-2026-76071-netis-nc63-ipfilter-stack-buffer-overflow/
generic

GitHub - ozcanpng/CVE-2026-76071: Original research and non-destructive PoC for a pre-auth stack buffer overflow via unbounded sscanf scanset in the Netis NC63 ipFilterList handler · GitHub

https://github.com/ozcanpng/CVE-2026-76071

Vendor Advisories for CVE-2026-76071(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 50× in last 7d / 50× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-30 05:23 UTCGHSA enrichment
  2. 2026-08-30 01:26 UTCEG score recompute
  3. 2026-08-30 01:26 UTCGHSA enrichment
  4. 2026-08-30 01:22 UTCEPSS rescore
  5. 2026-08-29 21:30 UTCGHSA enrichment
  6. 2026-08-29 17:34 UTCGHSA enrichment
  7. 2026-08-29 12:33 UTCGHSA enrichment
  8. 2026-08-29 08:30 UTCGHSA enrichment
  9. 2026-08-29 04:32 UTCGHSA enrichment
  10. 2026-08-29 00:26 UTCEG score recompute
  11. 2026-08-29 00:26 UTCGHSA enrichment
  12. 2026-08-28 21:42 UTCEPSS rescore
  13. 2026-08-28 18:54 UTCGHSA enrichment
  14. 2026-08-28 14:55 UTCGHSA enrichment
  15. 2026-08-28 10:49 UTCGHSA enrichment
  16. 2026-08-28 06:47 UTCGHSA enrichment
  17. 2026-08-28 02:52 UTCGHSA enrichment
  18. 2026-08-27 22:56 UTCGHSA enrichment
  19. 2026-08-27 19:00 UTCGHSA enrichment
  20. 2026-08-27 15:03 UTCEG score recompute
  21. 2026-08-27 15:03 UTCGHSA enrichment
  22. 2026-08-27 14:25 UTCEPSS rescore
  23. 2026-08-27 11:08 UTCGHSA enrichment
  24. 2026-08-27 07:10 UTCGHSA enrichment
  25. 2026-08-27 03:14 UTCGHSA enrichment
Show 25 more
  1. 2026-08-26 23:19 UTCGHSA enrichment
  2. 2026-08-26 19:22 UTCEG score recompute
  3. 2026-08-26 19:22 UTCGHSA enrichment
  4. 2026-08-26 18:41 UTCEG score recompute
  5. 2026-08-26 18:41 UTCGHSA enrichment
  6. 2026-08-26 15:40 UTCEG score recompute
  7. 2026-08-26 15:40 UTCGHSA enrichment
  8. 2026-08-26 14:47 UTCEPSS rescore
  9. 2026-08-26 11:41 UTCGHSA enrichment
  10. 2026-08-26 07:46 UTCGHSA enrichment
  11. 2026-08-26 03:50 UTCGHSA enrichment
  12. 2026-08-25 23:54 UTCGHSA enrichment
  13. 2026-08-25 19:58 UTCGHSA enrichment
  14. 2026-08-25 16:02 UTCEG score recompute
  15. 2026-08-25 16:02 UTCGHSA enrichment
  16. 2026-08-25 13:49 UTCEPSS rescore
  17. 2026-08-25 12:06 UTCGHSA enrichment
  18. 2026-08-25 08:10 UTCGHSA enrichment
  19. 2026-08-25 04:12 UTCGHSA enrichment
  20. 2026-08-25 00:16 UTCGHSA enrichment
  21. 2026-08-24 20:20 UTCEG score recompute
  22. 2026-08-24 20:20 UTCGHSA enrichment
  23. 2026-08-24 16:25 UTCEG score recompute
  24. 2026-08-24 15:46 UTCEG score recompute
  25. 2026-08-24 15:46 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-76071?
CVE-2026-76071 is a critical vulnerability published on August 24, 2026. 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…
When was CVE-2026-76071 disclosed?
CVE-2026-76071 was first published in the National Vulnerability Database on August 24, 2026, with the most recent update on August 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-76071 actively exploited?
CVE-2026-76071 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 38.3% of all scored CVEs.
What is the CVSS score of CVE-2026-76071?
CVE-2026-76071 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-76071?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-76071, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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