CVE-2026-76861

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-16. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: None knownExposed: 0

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

Netcore NR255-V version 1.5.130703 contains a stack-based buffer overflow in ntools_tcpdump_start_set.cgi caused by an unsized sprintf call when processing form values. An attacker can submit crafted input to this cgi endpoint to overflow the stack buffer and potentially execute arbitrary code.

CVSS v3
8.8
EG Score
8.8(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

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
Severity88% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
50%
KEV
Not listed

Published

September 15, 2026

Last Modified

September 21, 2026

Advisory Details (2)

Auto-updated Sep 15, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

Netcore NR255-V 1.5.130703 Stack-Based Buffer Overflow in ntools_tcpdump_start_set.cgi | Advisories | VulnCheck

https://www.vulncheck.com/advisories/netcore-nr255-v-1.5.130703-stack-based-buffer-overflow-in-ntools-tcpdump-start-set-cgi
generic🟡 PoC Available

netcore-router-public-refs/2026.08.19-netcore-nr255v-tcpdump-overflow.md at main · draw-ctf/netcore-router-public-refs · GitHub

https://github.com/draw-ctf/netcore-router-public-refs/blob/main/2026.08.19-netcore-nr255v-tcpdump-overflow.md

Vendor Advisories for CVE-2026-76861(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 29× in last 7d / 41× 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. 2026-09-25 06:46 UTCGHSA enrichment
  2. 2026-09-24 18:54 UTCEG score recompute
  3. 2026-09-24 18:54 UTCGHSA enrichment
  4. 2026-09-24 14:04 UTCEPSS rescore
  5. 2026-09-24 07:04 UTCGHSA enrichment
  6. 2026-09-23 19:14 UTCEG score recompute
  7. 2026-09-23 19:14 UTCGHSA enrichment
  8. 2026-09-23 17:54 UTCEPSS rescore
  9. 2026-09-23 07:00 UTCGHSA enrichment
  10. 2026-09-22 19:10 UTCEG score recompute
  11. 2026-09-22 19:10 UTCGHSA enrichment
  12. 2026-09-22 16:01 UTCEPSS rescore
  13. 2026-09-22 07:20 UTCEG score recompute
  14. 2026-09-22 07:20 UTCGHSA enrichment
  15. 2026-09-21 21:09 UTCEPSS rescore
  16. 2026-09-21 19:30 UTCEG score recompute
  17. 2026-09-21 19:30 UTCGHSA enrichment
  18. 2026-09-21 18:29 UTCGHSA enrichment
  19. 2026-09-21 06:37 UTCEG score recompute
  20. 2026-09-21 06:37 UTCGHSA enrichment
  21. 2026-09-20 20:16 UTCEPSS rescore
  22. 2026-09-20 18:47 UTCGHSA enrichment
  23. 2026-09-20 06:57 UTCGHSA enrichment
  24. 2026-09-19 18:54 UTCEG score recompute
  25. 2026-09-19 18:54 UTCGHSA enrichment
Show 16 more
  1. 2026-09-19 07:04 UTCEG score recompute
  2. 2026-09-19 07:04 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 19:15 UTCGHSA enrichment
  5. 2026-09-18 07:23 UTCGHSA enrichment
  6. 2026-09-17 19:33 UTCEG score recompute
  7. 2026-09-17 19:33 UTCGHSA enrichment
  8. 2026-09-17 07:43 UTCGHSA enrichment
  9. 2026-09-16 19:53 UTCEG score recompute
  10. 2026-09-16 19:53 UTCGHSA enrichment
  11. 2026-09-16 14:08 UTCEPSS rescore
  12. 2026-09-16 10:10 UTCEG score recompute
  13. 2026-09-16 10:10 UTCGHSA enrichment
  14. 2026-09-15 22:19 UTCEG score recompute
  15. 2026-09-15 22:04 UTCEG score recompute
  16. 2026-09-15 22:02 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-76861?
CVE-2026-76861 is a high vulnerability published on September 15, 2026. Netcore NR255-V version 1.5.130703 contains a stack-based buffer overflow in ntoolstcpdumpstart_set.cgi caused by an unsized sprintf call when processing form values. An attacker can submit crafted input to this cgi endpoint to overflow the stack buffer and potentially execute arbitrary code.
When was CVE-2026-76861 disclosed?
CVE-2026-76861 was first published in the National Vulnerability Database on September 15, 2026, with the most recent update on September 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-76861 actively exploited?
CVE-2026-76861 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 49.9% of all scored CVEs.
What is the CVSS score of CVE-2026-76861?
CVE-2026-76861 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-76861?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-76861, 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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