Vulnerability
CVE-2025-21042
Samsung Android: unauthenticated out-of-bounds write leading to code execution
Most severe levelDEFCON 1 · Critical risk
Official data
- CVSS 3.1
- 9.8 · critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-787
- EPSS
- 33.17% probability of exploitation in the next 30 days, higher than 98% of CVEs
- CISA KEV catalogue
- Yes, since 10 November 2025
Sources: NVD (CVSS, weakness, publication), FIRST (EPSS), CISA (KEV catalogue).
Data read on 4 November 2026.
Timeline
- 12 September 2025Published on NVD
- 10 November 2025Added to the CISA KEV catalogue
In DefenceLevel briefings4 days
- 13 November 2025Still ongoingDEFCON 3
- 12 November 2025Still ongoingDEFCON 3
- 11 November 2025New in the last 24 hoursDEFCON 1
- 8 November 2025Worth watching
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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