CISA KEV · Known exploitedMedium

CVE-2019-5591

Fortinet FortiOS

A Default Configuration vulnerability in FortiOS may allow an unauthenticated attacker on the same subnet to intercept sensitive information by impersonating the LDAP server.

CVSS
6.5
EPSS
18.6%
97.0% percentile
CISA KEV
Listed
Published
2020.08.15
PRIORITY ASSESSMENT

Immediate review

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

Known exploitationConfirmed by CISA KEV
Exploit probability18.6%
Technical severityCVSS 6.5

Vulnerability overview

A Default Configuration vulnerability in FortiOS may allow an unauthenticated attacker on the same subnet to intercept sensitive information by impersonating the LDAP server.

Affected product and versions

Product
Fortinet FortiOS
Affected versions
FortiOS 6.2.0 and below., <= 6.2.0
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
CISA required action

Apply updates per vendor instructions.

Due date: 2022.05.03
  1. 1
    Identify

    Confirm that Fortinet FortiOS and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE
CWE-306
KEV added
2021.11.03
Ransomware use
미확인
CVE-2019-5591 — Fortinet FortiOS | SECUFOCUS NOW