Vulnerability identifier: #VU23072

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-15705

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
FortiOS
Operating systems & Components / Operating system

Vendor: Fortinet, Inc

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input in the SSL VPN portal. A remote attacker can send a specially crafted POST request and crash the SSL VPN service.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

FortiOS: 6.2.0 - 6.2.1, 6.0.0 - 6.0.6, 5.6.0 - 5.6.11, 5.4 - 5.4.12, 5.2.0 - 5.2.15, 5.0 - 5.0.14, 4.3.0 - 4.3.16, 4.2.0 - 4.2.13, 4.1.0 - 4.1.11, 3.0, 3 beta, 2.36 - 2.80

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External links
http://fortiguard.com/advisory/FG-IR-19-236

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.