7.8

CVE-2025-46776: fortinet fortiextender_firmware Classic Buffer Overflow

CVSS: 7.8v3.1HighModified
Published 18-11-2025Last modified 14-01-2026
Open JSON

Vulnerability summary

CVE-2025-46776 is a high (CVSS 7.8) Classic Buffer Overflow vulnerability in fortinet fortiextender_firmware. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 5.5% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (NVD)
EPSS score
0.17%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 18-11-2025
    PublishedVulnerability first disclosed.
  2. 14-01-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.17%

Chance of exploitation in the next 30 days

Percentile

6%

Versus all other CVEs

30-day change

+0.01 pp

From 0.15% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.17%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Fortinet1 product
  • fortiextender_firmware≥ 7.6.0, ≤ 7.6.1 | ≥ 7.4.0, ≤ 7.4.6 | ≥ 7.2.0, ≤ 7.2.5 | ≥ 7.0.0, ≤ 7.0.5 | ≥ 7.0.0, < 7.4.8 | ≥ 7.6.0, < 7.6.3

1 vendor · 1 product

References

1 links