What is CVE-2025-46776?

CVE-2025-46776 is a medium-severity vulnerability in Fortinet Fortiextender, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 6.4/10. Published 2025-11-18.

How severe is CVE-2025-46776?

Medium severity. CVSS v3 base score is 6.4 out of 10.

Buffer overflow in Fortinet Fortiextender

CVE-2025-46776

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.

Vulnerability class: Buffer Overflow

Published 2025-11-18 · last modified 2026-10-18.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.002 (5.6th percentile), scored 2026-10-23.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 6th percentile — 5.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000

Affected products

Fortinet Fortiextender — versions 7.6.0, 7.4.0, 7.2.0
Fortinet Fortiextender Firmware

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

fortiguard.fortinet.com/psirt/FG-IR-25-251 (Vendor Advisory)

Frequently asked questions

What is CVE-2025-46776?: CVE-2025-46776 is a medium-severity vulnerability in Fortinet Fortiextender, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 6.4/10. Published 2025-11-18.
How severe is CVE-2025-46776?: Medium severity. CVSS v3 base score is 6.4 out of 10.