CVE-2026-76861

HIGHPre-NVD 8.88.8
EchelonGraph scoreMEDIUM confidence

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

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, GitHub Security Advisory, a secondary CVSS source
Trending — 3 sources updated this week

Also known asEUVD-2026-80033 (ENISA EUVD) · GHSA-hj8p-w4gv-7pjf (GitHub Security Advisories)Source: ENISA EUVD

8.8EG
EchelonGraph verdictPlan mitigationNo fix is confirmed yet: check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 8.8Exploit: None knownExposed services: Not assessed

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

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
8.8HIGHmedium confidence
EG Risk
40
EG Risk 40/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity88% × 45%
Impact severity (EG Severity): CVSS 8.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.7% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (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. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule.
EPSS PROB
0.7%
EPSS %ILE
52nd
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (8.8): severity, escalated by confirmed exploitation. This CVE's 8.8 is its impact severity (EG Severity), not escalated.

EG Severity
8.8 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.7% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-28). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says. In the directive's words, “Fix on system upgrade” means that, “unless conditions change”, the vulnerability “should be remediated the next time the vulnerable asset receives a scheduled major upgrade or rebuild”: its timelines are “dynamic as facts change”, and a KEV listing shortens them.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

No fix is confirmed yet. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule.

Exploitation none (CISA Vulnrichment) · Automatable no (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)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says. In the directive's words, “Fix on system upgrade” means that, “unless conditions change”, the vulnerability “should be remediated the next time the vulnerable asset receives a scheduled major upgrade or rebuild”: its timelines are “dynamic as facts change”, and a KEV listing shortens them.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (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

September 15, 2026

Last Modified

September 21, 2026

Advisory Details (2)

Auto-updated Sep 15, 2026
No fix on record yet.
Web page

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
Web page

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 9× in last 7d / 69× 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 141 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 41 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  2. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  3. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  4. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  5. 2026-10-29 12:58 UTCEG score recompute
  6. 2026-10-29 12:58 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  7. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  8. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  9. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  10. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  11. 2026-10-25 14:01 UTCEG score recompute
  12. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  13. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  14. 2026-10-22 18:08 UTCEG score recompute
  15. 2026-10-22 18:08 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  16. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  17. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  18. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  19. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  20. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  21. 2026-10-18 03:12 UTCEG score recompute
  22. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  23. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  24. 2026-10-16 00:34 UTCEG score recompute
  25. 2026-10-16 00:34 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
Show 75 more
  1. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  2. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  3. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  4. 2026-10-13 07:03 UTCEG score recompute
  5. 2026-10-13 07:03 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  6. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  7. 2026-10-12 15:38 UTCEG score recompute
  8. 2026-10-11 21:37 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  9. 2026-10-11 19:23 UTCEG score recompute
  10. 2026-10-11 16:39 UTCEG score recompute
  11. 2026-10-11 13:58 UTCEG score recompute
  12. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  13. 2026-10-11 09:21 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  14. 2026-10-10 20:45 UTCEG score recompute
  15. 2026-10-10 20:45 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  16. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  17. 2026-10-10 08:49 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  18. 2026-10-09 20:59 UTCEG score recompute
  19. 2026-10-09 20:58 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  20. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  21. 2026-10-09 09:08 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  22. 2026-10-08 20:53 UTCEG score recompute
  23. 2026-10-08 20:53 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  24. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  25. 2026-10-08 06:26 UTCEG score recompute
  26. 2026-10-08 06:26 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  27. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  28. 2026-10-07 18:35 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  29. 2026-10-07 06:44 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  30. 2026-10-06 18:54 UTCEG score recompute
  31. 2026-10-06 18:54 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  32. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  33. 2026-10-06 07:05 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  34. 2026-10-05 18:52 UTCEG score recompute
  35. 2026-10-05 18:52 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  36. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  37. 2026-10-05 06:57 UTCEG score recompute
  38. 2026-10-05 06:57 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  39. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  40. 2026-10-04 19:07 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  41. 2026-10-04 06:40 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  42. 2026-10-03 18:51 UTCEG score recompute
  43. 2026-10-03 18:51 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  44. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  45. 2026-10-03 06:40 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  46. 2026-10-02 18:50 UTCEG score recompute
  47. 2026-10-02 18:50 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  48. 2026-10-02 07:00 UTCEG score recompute
  49. 2026-10-02 07:00 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  50. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  51. 2026-10-01 19:10 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  52. 2026-10-01 07:20 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  53. 2026-09-30 19:30 UTCEG score recompute
  54. 2026-09-30 19:30 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  55. 2026-09-30 07:40 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  56. 2026-09-29 19:48 UTCEG score recompute
  57. 2026-09-29 19:47 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  58. 2026-09-29 15:24 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  59. 2026-09-29 06:17 UTCEG score recompute
  60. 2026-09-29 06:17 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  61. 2026-09-28 18:27 UTCEG score recompute
  62. 2026-09-28 18:27 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  63. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  64. 2026-09-28 06:37 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  65. 2026-09-27 18:47 UTCEG score recompute
  66. 2026-09-27 18:47 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  67. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  68. 2026-09-27 06:58 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  69. 2026-09-26 19:07 UTCEG score recompute
  70. 2026-09-26 19:07 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  71. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  72. 2026-09-26 07:13 UTCEG score recompute
  73. 2026-09-26 07:13 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8
  74. 2026-09-26 00:28 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  75. 2026-09-25 19:24 UTCGHSA enrichmentGHSA-hj8p-w4gv-7pjf · GitHub severity HIGH · GitHub CVSS 8.8

Frequently asked(5)

What is CVE-2026-76861?
CVE-2026-76861 is a high-severity vulnerability; its CVE record was published on September 15, 2026. 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.
When was CVE-2026-76861 made public?
CVE-2026-76861 was made public on September 4, 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 September 15, 2026. EchelonGraph's copy of the record carries a last-modified date of September 21, 2026; the record at its source may have been updated since.
Is CVE-2026-76861 actively exploited?
CVE-2026-76861 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (52nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-76861?
CVE-2026-76861 has a CVSS base score of 8.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-76861?
No fix for CVE-2026-76861 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 vendor advisories EchelonGraph has for CVE-2026-76861 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-76861

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