CISA KEV · Known exploitedMedium

CVE-2018-13383

Fortinet FortiOS and FortiProxy

A heap buffer overflow in Fortinet FortiOS 6.0.0 through 6.0.4, 5.6.0 through 5.6.10, 5.4.0 through 5.4.12, 5.2.14 and earlier and FortiProxy 2.0.0, 1.2.8 and earlier in the SSL VPN web portal may cause the SSL VPN web service termination for logged in users due to a failure to properly handle javascript href data when proxying webpages.

CVSS: 6.5
EPSS: 33.6%
CISA KEV: Listed
Published: 2019.05.30

PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV

Exploit probability33.6%

Technical severityCVSS 6.5

Vulnerability overview

Affected product and versions

Product: Fortinet FortiOS and FortiProxy
Affected versions: FortiOS 6.0.0 through 6.0.4, 5.6.0 through 5.6.10, 5.4.0 through 5.4.12, 5.2.14 and earlier, FortiProxy 2.0.0, 1.2.8 and earlier, < 1.2.9, 2.0.0, >= 5.2.0 < 5.2.15, >= 5.4.0 < 5.4.13, >= 5.6.0 < 5.6.11, >= 6.0.0 < 6.0.5
Fixed versions: 1.2.9, 5.2.15, 5.4.13, 5.6.11, 6.0.5

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

CISA required action

Apply updates per vendor instructions.

Due date: 2022.07.10

1
Identify
Confirm that Fortinet FortiOS and FortiProxy and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CWE: CWE-787
KEV added: 2022.01.10
Ransomware use: 확인됨