CVE-2026-76071

CRITICALPre-NVD 9.89.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

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, GitHub Security Advisory, a secondary CVSS source
Trending — 3 sources updated this weekElevated
9.8EG
EchelonGraph verdictPlan mitigationRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 1.4%CVSS: 9.8Exploit: No code on recordExposed services: Not assessed

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

The CVE record's CNA (VulnCheck) lists Netis Systems NC63 versions up to and including 3.0.0.3327 as affected. No release containing a fix is confirmed on record.

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
9.8CRITICALmedium confidence
EG Risk
75
EG Risk 75/100

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 (value × EchelonGraph’s weight)
Severity98% × 45%
The EG Score, 9.8 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
1.4%
EPSS %ILE
72nd
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)3 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 24, 2026

Last Modified

October 12, 2026

Advisory Details (4)

Auto-updated Oct 13, 2026
🔬 Proof of concept available. No fix on record yet.
Web page

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
Web page

NC63

https://www.netis-systems.com/products/NC63.html
Web page🟡 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/
Web page

GitHub - ozcanpng/CVE-2026-76071: Original research and 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 23× in last 7d / 176× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 340 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 240 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:35 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
  2. 2026-10-13 14:33 UTCEG score recompute
  3. 2026-10-13 14:33 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  4. 2026-10-12 16:35 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
  5. 2026-10-12 15:25 UTCEG score recompute
  6. 2026-10-12 15:25 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  7. 2026-10-12 05:33 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  8. 2026-10-11 19:24 UTCEG score recompute
  9. 2026-10-11 16:40 UTCEG score recompute
  10. 2026-10-11 13:59 UTCEG score recompute
  11. 2026-10-11 13:49 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
  12. 2026-10-10 20:00 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
  13. 2026-10-10 16:34 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  14. 2026-10-10 12:38 UTCEG score recompute
  15. 2026-10-10 12:38 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  16. 2026-10-09 20:07 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
  17. 2026-10-09 04:52 UTCEG score recompute
  18. 2026-10-09 04:52 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  19. 2026-10-08 17:13 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  20. 2026-10-08 08:16 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  21. 2026-10-08 03:59 UTCEG score recompute
  22. 2026-10-08 03:58 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  23. 2026-10-07 23:48 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  24. 2026-10-07 09:09 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  25. 2026-10-07 05:08 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
Show 75 more
  1. 2026-10-07 01:11 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  2. 2026-10-06 20:48 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  3. 2026-10-06 16:12 UTCEG score recompute
  4. 2026-10-06 16:12 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  5. 2026-10-06 15:18 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  6. 2026-10-06 12:05 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  7. 2026-10-06 07:45 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  8. 2026-10-06 02:51 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  9. 2026-10-05 17:45 UTCEG score recompute
  10. 2026-10-05 17:45 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  11. 2026-10-05 17:43 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  12. 2026-10-05 13:49 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  13. 2026-10-05 09:22 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  14. 2026-10-05 05:23 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  15. 2026-10-05 01:27 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  16. 2026-10-04 20:42 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  17. 2026-10-04 14:40 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  18. 2026-10-04 10:11 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  19. 2026-10-04 06:15 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  20. 2026-10-04 02:19 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  21. 2026-10-03 20:27 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  22. 2026-10-03 16:32 UTCEG score recompute
  23. 2026-10-03 16:32 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  24. 2026-10-03 14:26 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  25. 2026-10-03 04:33 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  26. 2026-10-03 00:37 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  27. 2026-10-02 18:54 UTCEG score recompute
  28. 2026-10-02 18:54 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  29. 2026-10-02 14:58 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  30. 2026-10-02 11:03 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  31. 2026-10-02 06:43 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  32. 2026-10-02 01:19 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  33. 2026-10-01 21:03 UTCEG score recompute
  34. 2026-10-01 21:03 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  35. 2026-10-01 19:50 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  36. 2026-10-01 13:33 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  37. 2026-10-01 09:37 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  38. 2026-10-01 05:37 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  39. 2026-10-01 01:08 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  40. 2026-09-30 20:18 UTCEG score recompute
  41. 2026-09-30 20:18 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  42. 2026-09-30 11:45 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  43. 2026-09-30 07:13 UTCEG score recompute
  44. 2026-09-30 07:13 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  45. 2026-09-29 15:24 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  46. 2026-09-29 15:14 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  47. 2026-09-29 05:38 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  48. 2026-09-29 01:41 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  49. 2026-09-28 21:32 UTCEG score recompute
  50. 2026-09-28 21:32 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  51. 2026-09-28 14:10 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  52. 2026-09-28 10:14 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  53. 2026-09-28 06:18 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  54. 2026-09-28 02:22 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  55. 2026-09-27 22:27 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  56. 2026-09-27 18:31 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  57. 2026-09-27 14:32 UTCEG score recompute
  58. 2026-09-27 14:31 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  59. 2026-09-27 13:48 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  60. 2026-09-27 09:46 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  61. 2026-09-27 05:51 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  62. 2026-09-27 00:38 UTCEG score recompute
  63. 2026-09-27 00:38 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  64. 2026-09-26 15:59 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  65. 2026-09-26 00:28 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  66. 2026-09-25 16:59 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  67. 2026-09-25 13:03 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  68. 2026-09-25 09:07 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  69. 2026-09-25 05:11 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  70. 2026-09-25 01:16 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  71. 2026-09-24 21:20 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  72. 2026-09-24 19:40 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  73. 2026-09-24 15:44 UTCEG score recompute
  74. 2026-09-24 15:44 UTCGHSA enrichmentGHSA-mx2q-89wp-jrvh · GitHub severity CRITICAL · GitHub CVSS 9.8
  75. 2026-09-24 14:04 UTCEPSS rescoreEPSS 1.4% · 71st percentile

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-76071?
CVE-2026-76071 is a critical-severity vulnerability; its CVE record was 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 made public?
CVE-2026-76071 was made public on August 20, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on August 24, 2026. EchelonGraph's copy of the record carries a last-modified date of October 12, 2026; the record at its source may have been updated since.
Is CVE-2026-76071 actively exploited?
CVE-2026-76071 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.4% probability of exploitation in the next 30 days (72nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-76071?
CVE-2026-76071 has a CVSS base score of 9.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-76071?
No fix for CVE-2026-76071 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The CVE record's CNA (VulnCheck) lists Netis Systems NC63 versions up to and including 3.0.0.3327 as affected. No release containing a fix is confirmed on record. The vendor advisories EchelonGraph has for CVE-2026-76071 are linked in the Vendor Advisories panel on this page.

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