Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2025-53843
Fortinet FortiOS — A stack-based buffer overflow vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2 all version…
AV AC PR UI S C I A CVSS EPSS %ile KEV
N H L N U H H H 7.5 .0059 47.1 —
AFFECTED
Product Versions Fixed
FortiOS 7.6.0 – —
TIMELINE
Jul 10 Reserved by fortinet
Nov 18 Published (CNA: fortinet)
Oct 18 RESCORED — CVE-2025-53843 (Fortinet FortiOS). CVSS 6.9 → 7.5 (NVD).
Description
A stack-based buffer overflow vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2 all versions, FortiOS 7.0 all versions, FortiOS 6.4 all versions allows attacker to execute unauthorized code or commands via specially crafted packets
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| July 10, 2025 | Reserved | Reserved by fortinet |
| November 18, 2025 | Published | Published (CNA: fortinet) |
| October 18, 2026 | RESCORED | RESCORED — CVE-2025-53843 (Fortinet FortiOS). CVSS 6.9 → 7.5 (NVD). |
Affected
Affected products and packages — 1 row
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| Fortinet | FortiOS | — | 7.6.0 | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2025-53843 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
