Vulnerability
CVE-2025-14733
WatchGuard Fireware: unauthenticated out-of-bounds write leading to code execution
Most severe levelDEFCON 2 · Severe risk
Official data
- CVSS 4.0
- 9.3 · critical
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/U:Red - Weakness
- CWE-787
- EPSS
- 26.51% probability of exploitation in the next 30 days, higher than 97% of CVEs
- CISA KEV catalogue
- Yes, since 19 December 2025 · used in ransomware campaigns
Sources: NVD (CVSS, weakness, publication), FIRST (EPSS), CISA (KEV catalogue).
Data read on 5 November 2026.
Timeline
- 19 December 2025Published on NVD
- 19 December 2025Added to the CISA KEV catalogue
- 20 December 2025First in the DefenceLevel briefing
In DefenceLevel briefings3 days
- 22 December 2025Still ongoingDEFCON 3
- 21 December 2025Still ongoingDEFCON 3
- 20 December 2025New in the last 24 hoursDEFCON 2
Last 12 months.
The full analysis is in the briefingThe full analysis is in your archive
Why it matters now, who is affected and what to do: every day at 05:00 UTC, for subscribers.Why it matters, who is affected and what to do, as in the daily briefing.
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