Denial of service in Cisco Meraki MX and Z3 Teleworker Gateway devices

1) Input validation error

EUVDB-ID: #VU68524

Risk: High

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2022-20933

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

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

CPE2.3

• cpe:2.3:h:cisco_systems:meraki_mx:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:meraki_mx:16.2:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:meraki_mx:17.0:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:meraki_z3:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_meraki_z3c:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_meraki_mx64:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_meraki_mx64w:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_meraki_mx65:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_meraki_mx65w:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_meraki_mx67:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_meraki_mx67cw:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_meraki_mx67w:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_meraki_mx68:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_meraki_mx68cw:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_meraki_mx68w:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_meraki_mx75:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_meraki_mx84:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_meraki_mx85:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_meraki_mx95:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_meraki_mx100:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_meraki_mx105:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_meraki_mx250:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_meraki_mx400:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_meraki_mx450:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_meraki_mx600:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_meraki_vmx:*:*:*:*:*:*:*:*

External links

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

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.