CVE-2026-70465 Memory corruption in FortiClientWindows
An unauthenticated attacker can execute arbitrary code on FortiClient Windows by sending malicious DNS responses, requiring immediate patching.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-70465?
CVE-2026-70465 is a high-severity memory corruption vulnerability in Fortinet Forticlient, published on 12 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-120
Which versions are affected by CVE-2026-70465?
It affects 1 product.
Products include Fortinet Forticlient.
How do I fix CVE-2026-70465?
No fix has been published for CVE-2026-70465 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-70465 being exploited?
There is no known exploitation of CVE-2026-70465 in the wild and no public exploit code.
Other vulnerabilities in Fortinet Forticlient
- CVE-2019-17658 Privilege escalation in Fortinet FortiClientWindows
- CVE-2023-45590 Code injection in FortiClientLinux
- CVE-2017-14184 Information disclosure in FortiClient SSLVPN Client for Linux
- CVE-2016-8493 Privilege escalation in Fortinet FortiClient
- CVE-2020-15934 Privilege escalation in FortiClientLinux
Sources
Also known as GHSA-95wv-6wmf-f8vm.