CVE-2025-46776: A buffer copy without checking size of input ('classic buffer overflow') vulnerability in Fortinet FortiExtend

Q: How do I fix CVE-2025-46776?

fortiextender firmware: upgrade to 7.4.8, 7.6.3. Exact commands for each OS are on this page.

Q: Is CVE-2025-46776 being exploited?

CVE-2025-46776 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-46776 affect?

CVE-2025-46776 affects fortiextender firmware. Severity is medium (CVSS 6.4). A buffer copy without checking size of input ('classic buffer overflow') vulnerability in Fortinet FortiExtender 7.6.0 through 7.6.1, FortiExtender 7.4.0 through 7.4.6, FortiExtender 7.2 all versions, FortiExtender 7.0 all versions may allo

Q: How urgent is CVE-2025-46776?

Priority 24/100. No elevated risk signals yet.

Routine

MEDIUM 6.4UPGRADE

CVE-2025-46776 is a medium-severity flaw (CVSS 6.4) affecting fortiextender firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A buffer copy without checking size of input ('classic buffer overflow') vulnerability in Fortinet FortiExtender 7.6.0 through 7.6.1, FortiExtender 7.4.0 through 7.4.6, FortiExtender 7.2 all versions, FortiExtender 7.0 all versions may allow an authenticated user to execute arbitrary code or commands via crafted CLI commands.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.4 (Medium)
Attack vector	Local
Attack complexity	High
Privileges needed	High
User interaction	None
EPSS exploit chance	0.2% (top 94%)
CISA exploited list	No
Weakness	CWE-120
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 fortiextender firmware UPGRADE

Affected: >= 7.0.0 and < 7.4.8 · >= 7.6.0 and < 7.6.3

Fixed in: 7.4.8, 7.6.3

Safe to downgrade to: a release before 7.0.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2025-46776?

fortiextender firmware: upgrade to 7.4.8, 7.6.3. Exact commands for each OS are on this page.

Is CVE-2025-46776 being exploited?

CVE-2025-46776 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-2025-46776 affect?

CVE-2025-46776 affects fortiextender firmware. Severity is medium (CVSS 6.4). A buffer copy without checking size of input ('classic buffer overflow') vulnerability in Fortinet FortiExtender 7.6.0 through 7.6.1, FortiExtender 7.4.0 through 7.4.6, FortiExtender 7.2 all versions, FortiExtender 7.0 all versions may allo

How urgent is CVE-2025-46776?

Priority 24/100. No elevated risk signals yet.

Software pages

Fortinet vulnerabilities

Related CVEs

CVE-2025-46775 MEDIUM 5.5 UPGRADE A debug messages revealing unnecessary information vulnerability in Fortinet FortiExtender 7.6.0 through 7.6.1
CVE-2025-64153 HIGH 7.2 UPGRADE A improper neutralization of special elements used in an os command ('os command injection') in Fortinet Forti
CVE-2024-23663 HIGH 8.8 UPGRADE An improper access control in Fortinet FortiExtender 4.1.1 - 4.1.9, 4.2.0 - 4.2.6, 5.3.2, 7.0.0 - 7.0.4, 7.2.0
CVE-2022-27489 HIGH 7.2 UPGRADE A improper neutralization of special elements used in an os command ('os command injection') in Fortinet Forti
CVE-2022-23447 HIGH 7.5 UPGRADE An improper limitation of a pathname to a restricted directory ('Path Traversal') vulnerability [CWE-22] in Fo

References

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