CVE-2026-76070

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 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.

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
60%
KEV
Not listed

Published

August 24, 2026

Last Modified

August 24, 2026

Advisory Details (4)

Auto-updated Aug 24, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

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

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

NC63

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

CVE-2026-76070: Unauthenticated Pre-Auth Stack Buffer Overflow via Base64-Decoded Password in Netis NC63 login.cgi Leading to RCE - ozcanpng

https://ozcanpng.dev/blog/cve-2026-76070-netis-nc63-login-stack-buffer-overflow/
generic

GitHub - ozcanpng/CVE-2026-76070: Original research and non-destructive PoC for a pre-auth Base64-decoded password stack buffer overflow in Netis NC63 login.cgi · GitHub

https://github.com/ozcanpng/CVE-2026-76070

Vendor Advisories for CVE-2026-76070(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 46× in last 7d / 46× 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 01:47 UTCEG score recompute
  2. 2026-08-30 01:47 UTCGHSA enrichment
  3. 2026-08-30 01:22 UTCEPSS rescore
  4. 2026-08-29 21:42 UTCGHSA enrichment
  5. 2026-08-29 17:36 UTCGHSA enrichment
  6. 2026-08-29 12:44 UTCGHSA enrichment
  7. 2026-08-29 08:37 UTCGHSA enrichment
  8. 2026-08-29 04:32 UTCGHSA enrichment
  9. 2026-08-29 00:26 UTCEG score recompute
  10. 2026-08-29 00:26 UTCGHSA enrichment
  11. 2026-08-28 21:42 UTCEPSS rescore
  12. 2026-08-28 19:25 UTCGHSA enrichment
  13. 2026-08-28 14:55 UTCGHSA enrichment
  14. 2026-08-28 10:49 UTCGHSA enrichment
  15. 2026-08-28 06:37 UTCGHSA enrichment
  16. 2026-08-28 02:25 UTCGHSA enrichment
  17. 2026-08-27 22:20 UTCGHSA enrichment
  18. 2026-08-27 18:14 UTCEG score recompute
  19. 2026-08-27 18:14 UTCGHSA enrichment
  20. 2026-08-27 14:25 UTCEPSS rescore
  21. 2026-08-27 13:06 UTCGHSA enrichment
  22. 2026-08-27 09:01 UTCGHSA enrichment
  23. 2026-08-27 04:56 UTCGHSA enrichment
  24. 2026-08-27 00:50 UTCGHSA enrichment
  25. 2026-08-26 20:45 UTCGHSA enrichment
Show 21 more
  1. 2026-08-26 16:29 UTCEG score recompute
  2. 2026-08-26 16:29 UTCGHSA enrichment
  3. 2026-08-26 14:47 UTCEPSS rescore
  4. 2026-08-26 12:24 UTCGHSA enrichment
  5. 2026-08-26 08:18 UTCGHSA enrichment
  6. 2026-08-26 04:13 UTCGHSA enrichment
  7. 2026-08-26 00:03 UTCGHSA enrichment
  8. 2026-08-25 19:56 UTCGHSA enrichment
  9. 2026-08-25 15:51 UTCEG score recompute
  10. 2026-08-25 15:51 UTCGHSA enrichment
  11. 2026-08-25 13:49 UTCEPSS rescore
  12. 2026-08-25 11:46 UTCGHSA enrichment
  13. 2026-08-25 07:39 UTCGHSA enrichment
  14. 2026-08-25 03:35 UTCGHSA enrichment
  15. 2026-08-24 23:30 UTCGHSA enrichment
  16. 2026-08-24 19:25 UTCEG score recompute
  17. 2026-08-24 19:25 UTCGHSA enrichment
  18. 2026-08-24 18:31 UTCEG score recompute
  19. 2026-08-24 16:25 UTCEG score recompute
  20. 2026-08-24 15:46 UTCEG score recompute
  21. 2026-08-24 15:46 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-76070?
CVE-2026-76070 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 submitting an oversized Base64-encoded password to the login handler in /bin/netis.cgi. Attackers can exploit the custom Base64…
When was CVE-2026-76070 disclosed?
CVE-2026-76070 was first published in the National Vulnerability Database on August 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-76070 actively exploited?
CVE-2026-76070 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 40.0% of all scored CVEs.
What is the CVSS score of CVE-2026-76070?
CVE-2026-76070 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-76070?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-76070, 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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