CVE-2026-96257

CRITICALPre-NVD 10.010.0—
EchelonGraph scoreHIGH confidence

Score 10.0 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-23. a secondary CVSS source baseline 10.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this weekElevated
10.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 10.0Exploit: Elevated riskExposed: 0

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

A flaw has been found in Fast FAC1203R Gigabit Edition 2.0.4. Affected by this issue is the function copy_msg_element of the component Device Discovery Service. Executing a manipulation can lead to stack-based buffer overflow. The attack can be executed remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

CVSS v3
10.0
EG Score
10.0(high)
EG Risk
76(Attend)
EG Risk 76/100SSVC: 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
Severity100% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
62%
KEV
Not listed

Published

September 23, 2026

Last Modified

September 23, 2026

Advisory Details (1)

Auto-updated Sep 23, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

vuls-find-VxWorks/vul-find-FAST_FAC1203R-copy_msg_element at main · xiaobor123/vuls-find-VxWorks · GitHub

https://github.com/xiaobor123/vuls-find-VxWorks/tree/main/vul-find-FAST_FAC1203R-copy_msg_element

Vendor Advisories for CVE-2026-96257(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 18× in last 7d / 18× 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. 2026-09-24 03:14 UTCGHSA enrichment
  2. 2026-09-23 23:22 UTCGHSA enrichment
  3. 2026-09-23 19:30 UTCEG score recompute
  4. 2026-09-23 19:30 UTCGHSA enrichment
  5. 2026-09-23 17:54 UTCEPSS rescore
  6. 2026-09-23 15:36 UTCGHSA enrichment
  7. 2026-09-23 15:17 UTCEG score recompute
  8. 2026-09-23 15:17 UTCGHSA enrichment
  9. 2026-09-23 15:16 UTCNVD updateCVSS v4 → 9.3
  10. 2026-09-23 14:25 UTCEG score recompute
  11. 2026-09-23 14:25 UTCGHSA enrichment
  12. 2026-09-23 14:24 UTCMITRE cvelistV5CVSS v4 → 10
  13. 2026-09-23 11:01 UTCGHSA enrichment
  14. 2026-09-23 07:09 UTCEG score recompute
  15. 2026-09-23 07:09 UTCGHSA enrichment
  16. 2026-09-23 03:27 UTCNVD updateCVSS v4 → 9.3
  17. 2026-09-23 03:18 UTCEG score recompute
  18. 2026-09-23 03:17 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-96257?
CVE-2026-96257 is a critical vulnerability published on September 23, 2026. A flaw has been found in Fast FAC1203R Gigabit Edition 2.0.4. Affected by this issue is the function copymsgelement of the component Device Discovery Service. Executing a manipulation can lead to stack-based buffer overflow. The attack can be executed remotely. The exploit has been published and…
When was CVE-2026-96257 disclosed?
CVE-2026-96257 was first published in the National Vulnerability Database on September 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-96257 actively exploited?
CVE-2026-96257 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 37.5% of all scored CVEs.
What is the CVSS score of CVE-2026-96257?
CVE-2026-96257 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2026-96257?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-96257, 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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