FortiClient and EMS
CVE-2026-70465: Classic buffer overflow in FortiClientWindows
A buffer copy without checking size of input ('classic buffer overflow') vulnerability in Fortinet FortiClientWindows 7.4.0 through 7.4.3, FortiClientWindows 7.2.0 through 7.2.11 may allow an unauthenticated attacker in a position to alter or craft DNS responses to the targeted host to execute arbitrary code via malicious packets.
Published
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| FortiClientWindows 7.4.0 to 7.4.3 | 7.4.4 or later |
| FortiClientWindows 7.2.0 to 7.2.11 | 7.2.12 or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
A buffer copy without checking size of input ('classic buffer overflow') vulnerability in Fortinet FortiClientWindows 7.4.0 through 7.4.3, FortiClientWindows 7.2.0 through 7.2.11 may allow an unauthenticated attacker in a position to alter or craft DNS responses to the targeted host to execute arbitrary code via malicious packets.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 10 Oct 2026.