CVE-2026-81433

HIGHPre-NVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (8th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 4 sources updated this week
8.7EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 8.7Exploit: None knownExposed services: Not assessed

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

A stack-based buffer overflow vulnerability in WatchGuard Fireware OS's DHCP fingerprinting daemon (fingerd) allows an unauthenticated attacker with adjacent network access to execute arbitrary code or crash the process by sending a specially crafted DHCP packet.

CVSS v3
8.7
EG Score
8.7HIGHmedium confidence
EG Risk
39
EG Risk 39/100CISA SSVC

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
Severity87% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.2%
EPSS %ILE
8th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 29, 2026

Last Modified

October 1, 2026

Advisory Details (1)

Auto-updated Sep 29, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic🔴 Active Exploitation

CVE-2026-81433 — Fireware OS Pre-Authentication Stack Buffer Overflow in fingerd Allows Remote Code Execution

https://psirt.watchguard.com/CVE-2026-81433

Vendor Advisories for CVE-2026-81433(1)

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

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 27× in last 7d / 27× 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. 2026-10-04 01:30 UTCEG score recompute
  2. 2026-10-04 01:30 UTCGHSA enrichment
  3. 2026-10-03 14:26 UTCEPSS rescore
  4. 2026-10-03 13:56 UTCGHSA enrichment
  5. 2026-10-03 02:24 UTCEG score recompute
  6. 2026-10-03 02:24 UTCGHSA enrichment
  7. 2026-10-02 17:57 UTCEPSS rescore
  8. 2026-10-02 14:52 UTCGHSA enrichment
  9. 2026-10-02 03:22 UTCEG score recompute
  10. 2026-10-02 03:22 UTCGHSA enrichment
  11. 2026-10-01 19:50 UTCEPSS rescore
  12. 2026-10-01 15:52 UTCGHSA enrichment
  13. 2026-10-01 04:21 UTCEG score recompute
  14. 2026-10-01 04:21 UTCGHSA enrichment
  15. 2026-10-01 04:09 UTCEG score recompute
  16. 2026-10-01 04:09 UTCGHSA enrichment
  17. 2026-09-30 16:42 UTCGHSA enrichment
  18. 2026-09-30 16:25 UTCEG score recompute
  19. 2026-09-30 16:25 UTCGHSA enrichment
  20. 2026-09-30 15:44 UTCEG score recompute
  21. 2026-09-30 15:44 UTCGHSA enrichment
  22. 2026-09-30 15:04 UTCEPSS rescore
  23. 2026-09-30 12:04 UTCGHSA enrichment
  24. 2026-09-30 00:33 UTCEG score recompute
  25. 2026-09-30 00:32 UTCGHSA enrichment
Show 2 more
  1. 2026-09-29 23:26 UTCEG score recompute
  2. 2026-09-29 23:23 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-81433?
CVE-2026-81433 is a high vulnerability published on September 29, 2026. A stack-based buffer overflow vulnerability in WatchGuard Fireware OS's DHCP fingerprinting daemon (fingerd) allows an unauthenticated attacker with adjacent network access to execute arbitrary code or crash the process by sending a specially crafted DHCP packet.
When was CVE-2026-81433 disclosed?
CVE-2026-81433 was first published on September 29, 2026, with the most recent update on October 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-81433 actively exploited?
CVE-2026-81433 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (8th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-81433?
CVE-2026-81433 has a CVSS base score of 8.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-81433?
No fix for CVE-2026-81433 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-2026-81433 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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