High severity · published Aug 12, 2026
CVE-2026-70465
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…
8.1
CVSS
0.5%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FO
FortiClientWindows · Fortinet
7.4.0 through 7.4.3; 7.2.0 through 7.2.11 · source: vendor
FO
Forticlient · Fortinet
7.2.0 before 7.2.12; 7.4.0 before 7.4.4 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-70465
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-70465
Vendor Advisory
https://fortiguard.fortinet.com/psirt/FG-IR-26-156
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