CVE-2025-46373: A Heap-based Buffer Overflow vulnerability [CWE-122] vulnerability in Fortinet FortiClientWindows 7.4.0 throug

Routine

HIGH 7.8UPGRADE

CVE-2025-46373 is a high-severity flaw (CVSS 7.8) affecting forticlient. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A Heap-based Buffer Overflow vulnerability [CWE-122] vulnerability in Fortinet FortiClientWindows 7.4.0 through 7.4.3, FortiClientWindows 7.2.0 through 7.2.8 may allow an authenticated local IPSec user to execute arbitrary code or commands via "fortips_74.sys". The attacker would need to bypass the Windows heap integrity protections

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 94%)
CISA exploited list	No
Weakness	CWE-122
Published	2025-11-18
Last modified	2026-10-18

Publisher (CNA): Fortinet, Inc. · Vendor: fortinet

Last updated 2026-10-18 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-11-18 17:16 UTCPublished CVE record published
2026-10-18 20:10 UTCUpdated Record last modified

fortinet forticlient UPGRADE

Affected: >= 7.2.0 and < 7.2.9 · >= 7.4.0 and < 7.4.4

Fixed in: 7.2.9, 7.4.4

Safe to downgrade to: a release before 7.2.0

1. Check installed version

apt-cache policy forticlient || rpm -q forticlient || forticlient --version

2. UPGRADE to 7.2.9 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade forticlient

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade forticlient

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 7.2.0 (Debian / Ubuntu)

apt-cache madison forticlient sudo apt install forticlient=<VERSION_BEFORE_7.2.0> sudo apt-mark hold forticlient

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list forticlient sudo dnf downgrade forticlient-<VERSION_BEFORE_7.2.0> sudo dnf versionlock add forticlient

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-46373?

forticlient: upgrade to 7.2.9, 7.4.4. Exact commands for each OS are on this page.

Is CVE-2025-46373 being exploited?

CVE-2025-46373 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-46373 affect?

CVE-2025-46373 affects forticlient. Severity is high (CVSS 7.8). A Heap-based Buffer Overflow vulnerability [CWE-122] vulnerability in Fortinet FortiClientWindows 7.4.0 through 7.4.3, FortiClientWindows 7.2.0 through 7.2.8 may allow an authenticated local IPSec user to execute arbitrary code or commands

How urgent is CVE-2025-46373?

Priority 29/100. High severity

Software pages

Windows vulnerabilities · Fortinet vulnerabilities

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References

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