Background exploitation KEV catalog Ransomware No authentication

CVE-2018-13382

Fortinet FortiOS and FortiProxy Improper Authorization

An Improper Authorization vulnerability in Fortinet FortiOS 6.0.0 to 6.0.4, 5.6.0 to 5.6.8 and 5.4.1 to 5.4.10 and FortiProxy 2.0.0, 1.2.0 to 1.2.8, 1.1.0 to 1.1.6, 1.0.0 to 1.0.7 under SSL VPN web portal allows an unauthenticated attacker…

CheckOps priority index

9.1/10 Patch within 24 h

Severity9.1

Probability8.2

Exploitation5/5

Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.

EPSS · today 81.7% higher than 99.6% of CVEs

CVSS 3.1 9.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:

Exploited for 1,758 days 10 Jan 2022

CISA due date 10 Jul 2022 for US federal agencies

Exploitation probability EPSS · FIRST

EPSS probability (%)Percentile among all CVEs

Exploitation signals 5 / 5

KEV catalog (CISA)10 Jan 2022
Exploited in EUVD (ENISA)10 Jan 2022
Used by ransomwareyes
EPSS above 10 %81.7%
No account, over the networkyes

What to do

Fix

Apply the vendor’s fix as soon as it is available.

CISA guidance: Apply updates per vendor instructions.

Meanwhile

Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.

Manufacturers (CRA)

Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained

Description ENISA EUVD

Affected products

Fortinet FortiOS, FortiProxyFortiOS and FortiProxy

Affected versions

FortiOS 6.0.0 to 6.0.4, 5.6.0 to 5.6.8, 5.4.1 to 5.4.10, FortiProxy 2.0.0, 1.2.0 to 1.2.8, 1.1.0 to 1.1.6, 1.0.0 to 1.0.7

Weaknesses (CWE)

CWE-285

Open source packages OSV

Affected libraries according to OSV, with fixed versions.

Timeline

04 Jun 2019
Published
10 Jan 2022
Exploitation reported (ENISA)
10 Jan 2022
Added to the KEV catalog
10 Jul 2022
CISA remediation due date
26 Sept 2026
EPSS peak: 81.7%

References

Other exploited vulnerabilities from the same vendor

CVE-2025-61624Fortinet Multiple Products Path Traversal Vulnerability
3.4 · Rising fast
CVE-2026-104286Fortinet FortiMail Path Traversal Vulnerability
5.9 · Actively exploited
CVE-2025-25249Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability
4.9 · Actively exploited
CVE-2025-68686Fortinet FortiOS Exposure of Sensitive Information to an Unauthorized Actor Vulnerability
5.4 · Actively exploited
CVE-2026-39808Fortinet FortiSandbox OS Command Injection Vulnerability
8.8 · Actively exploited
CVE-2026-25089Fortinet FortiSandbox OS Command Injection Vulnerability
8.3 · Actively exploited