CVE-2025-53949 — An Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') vulnerability [CWE-78] vulnerability in Fortinet FortiSandbox 5.0.0 through 5.0.2, FortiSandbox 4.4.0 through 4.4.7, FortiSandbox 4.2 all versions, FortiSandbox 4.0 all versions may allow an authenticated attacker to execute unauthorized code on the underlying system via crafted HTTP requests

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HIGH

An Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') vulnerability [CWE-78] vulnerability in Fortinet FortiSandbox 5.0.0 through 5.0.2, FortiSandbox 4.4.0 through 4.4.7, FortiSandbox 4.2 all versions, FortiSandbox 4.0 all versions may allow an authenticated attacker to execute unauthorized code on the underlying system via crafted HTTP requests

Published Dec 9, 2025

8.8

HIGH

CVSS 3.1

EPSS 17.19%

Description

An Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') vulnerability [CWE-78] vulnerability in Fortinet FortiSandbox 5.0.0 through 5.0.2, FortiSandbox 4.4.0 through 4.4.7, FortiSandbox 4.2 all versions, FortiSandbox 4.0 all versions may allow an authenticated attacker to execute unauthorized code on the underlying system via crafted HTTP requests.

Affected products

Vendor Fortinet Product FortiSandbox Default
unaffected
- Version
  4.2.1
  Status
  affected
  Constraints
  <=4.2.8
- Version
  4.4.0
  Status
  affected
  Constraints
  <=4.4.7
- Version
  5.0.0
  Status
  affected
  Constraints
  <=5.0.2

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Fortinet

FortiSandbox

unaffected

Version	Status	Constraints
4.2.1	affected	<=4.2.8
4.4.0	affected	<=4.4.7
5.0.0	affected	<=5.0.2

Remediation

Vendor solution

Upgrade to FortiSandbox version 5.0.3 or above Upgrade to FortiSandbox version 4.4.8 or above

Metrics

17.19% 0.17188

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.17188

Score over time

2025–2026

EPSS v4
EPSS v5

Percentile over time

EPSS v4
EPSS v5

Table of values (4 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	17.19% (0.17188)	97.01th	v5 (v2026.06.15)
Aug 6, 2026	17.32% (0.17323)	96.81th	v5 (v2026.06.15)
Jun 15, 2026	15.54% (0.15537)	96.39th	v5 (v2026.06.15)
Dec 10, 2025	0.07% (0.00074)	22.61th	v4 (v2025.03.14)