Vulnerability identifier: #VU68524

Vulnerability risk: High

CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-20933

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Meraki MX
Hardware solutions / Firmware
Meraki Z3
Hardware solutions / Firmware
Cisco Meraki Z3C
Hardware solutions / Firmware
Cisco Meraki MX67CW
Hardware solutions / Firmware
Cisco Meraki MX67W
Hardware solutions / Firmware
Cisco Meraki MX68CW
Hardware solutions / Firmware
Cisco Meraki MX68W
Hardware solutions / Firmware
Cisco Meraki MX64
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Meraki MX64W
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Meraki MX65
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Meraki MX65W
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Meraki MX67
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Meraki MX68
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Meraki MX75
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Meraki MX84
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Meraki MX85
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Meraki MX95
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Meraki MX100
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Meraki MX105
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Meraki MX250
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Meraki MX400
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Meraki MX450
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Meraki MX600
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Meraki vMX
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: Cisco Systems, Inc

Description

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

The vulnerability exists due to insufficient validation of client-supplied parameters while establishing an SSL VPN session. A remote attacker can send a specially crafted request to the application and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Meraki MX: 16.2 - 17.0

Meraki Z3: All versions

Cisco Meraki Z3C: All versions

Cisco Meraki MX64: All versions

Cisco Meraki MX64W: All versions

Cisco Meraki MX65: All versions

Cisco Meraki MX65W: All versions

Cisco Meraki MX67: All versions

Cisco Meraki MX67CW: All versions

Cisco Meraki MX67W: All versions

Cisco Meraki MX68: All versions

Cisco Meraki MX68CW: All versions

Cisco Meraki MX68W: All versions

Cisco Meraki MX75: All versions

Cisco Meraki MX84: All versions

Cisco Meraki MX85: All versions

Cisco Meraki MX95: All versions

Cisco Meraki MX100: All versions

Cisco Meraki MX105: All versions

Cisco Meraki MX250: All versions

Cisco Meraki MX400: All versions

Cisco Meraki MX450: All versions

Cisco Meraki MX600: All versions

Cisco Meraki vMX: All versions

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-meraki-mx-vpn-dos-vnESbgBf

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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.