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Known exploited vulnerability

CVE-2018-13383

mediumCVSS 3.1 6.5In CISA KEVRansomwareEPSS 31%Published · Fortinet

The short answer

CVE-2018-13383 affects Fortinet Fortinet FortiOS and FortiProxy and is rated medium (CVSS 6.5). CISA added it to the Known Exploited Vulnerabilities catalog on 2022-01-10: attackers are using it, so patch it first.

What it is

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.

Weakness: CWE-787.

Severity

6.5 medium

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

Exploited (CISA KEV)

Yes, since Jan 10, 2022

Federal due date Jul 10, 2022

EPSS, next 30 days

31%

Higher than 98% of scored CVEs

How it can be exploited

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

What CISA says to do

Apply updates per vendor instructions.

Affected products

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

References

Questions

Is CVE-2018-13383 being exploited?

Yes. CISA added CVE-2018-13383 to its Known Exploited Vulnerabilities catalog on 2022-01-10, with a federal remediation due date of 2022-07-10. CISA lists it as used in ransomware campaigns.

How do I fix CVE-2018-13383?

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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