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Known exploited vulnerability

CVE-2019-5591

mediumCVSS 3.1 6.5In CISA KEVRansomwareEPSS 19%Published · Fortinet

The short answer

CVE-2019-5591 affects Fortinet Fortinet FortiOS and is rated medium (CVSS 6.5). CISA added it to the Known Exploited Vulnerabilities catalog on 2021-11-03: attackers are using it, so patch it first.

What it is

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

Weakness: CWE-306.

Severity

6.5 medium

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

Exploited (CISA KEV)

Yes, since Nov 3, 2021

Federal due date May 3, 2022

EPSS, next 30 days

19%

Higher than 97% of scored CVEs

How it can be exploited

Attack vector
Adjacent network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

What CISA says to do

Apply updates per vendor instructions.

Affected products

Fortinet FortiOS. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2019-5591 being exploited?

Yes. CISA added CVE-2019-5591 to its Known Exploited Vulnerabilities catalog on 2021-11-03, with a federal remediation due date of 2022-05-03. CISA lists it as used in ransomware campaigns.

How do I fix CVE-2019-5591?

CISA's required action: Apply updates per vendor instructions.

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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