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CVE-2022-20933— Cisco Meraki MX and Z3 Teleworker Gateway VPN Denial of Service Vulnerability

Quick assessment

Affected
Cisco Cisco Meraki MX Firmware
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cisco Meraki MX Series Security Appliances是美国思科（Cisco）公司的Meraki MX 系列的安全路由器。该设备具有LTE、SD-WAN、状态防火墙和集成的Sourcefire入侵防御（IPS）引擎以确保网络安全。 Cisco Meraki MX Series Security Appliances 存在安全漏洞，该漏洞源于客户端验证不足，可能允许未经身份验证的远程攻击者在受影响的设备上造成拒绝服务(DoS)，攻击者可以通过制作恶意请求并将其发送到受影响的设备

CVSS 8.6 · High EPSS 1.03% · P62
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I. Basic Information for CVE-2022-20933

Vulnerability Information
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Vulnerability Title
Cisco Meraki MX and Z3 Teleworker Gateway VPN Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z3 Teleworker Gateway devices could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient validation of client-supplied parameters while establishing an SSL VPN session. An attacker could exploit this vulnerability by crafting a malicious request and sending it to the affected device. A successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to crash and restart, resulting in the failure of the established SSL VPN connections and forcing remote users to initiate a new VPN connection and re-authenticate. A sustained attack could prevent new SSL VPN connections from being established. Note: When the attack traffic stops, the Cisco AnyConnect VPN server recovers gracefully without requiring manual intervention. Cisco Meraki has released software updates that address this vulnerability.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未对缺失参数进行处理
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco Meraki MX Series Security Appliances 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco Meraki MX Series Security Appliances是美国思科（Cisco）公司的Meraki MX 系列的安全路由器。该设备具有LTE、SD-WAN、状态防火墙和集成的Sourcefire入侵防御（IPS）引擎以确保网络安全。 Cisco Meraki MX Series Security Appliances 存在安全漏洞，该漏洞源于客户端验证不足，可能允许未经身份验证的远程攻击者在受影响的设备上造成拒绝服务(DoS)，攻击者可以通过制作恶意请求并将其发送到受影响的设备
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Cisco Cisco Meraki MX Firmware n/a -

II. Public POCs for CVE-2022-20933

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III. Intelligence Information for CVE-2022-20933

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Vendor Advisories for CVE-2022-20933 (1)

Same Patch Batch · Cisco · 2022-10-26 · 8 CVEs total

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CVE-2022-20811 5.5 MEDIUM Cisco TelePresence Collaboration Endpoint and RoomOS Software Vulnerabilities

IV. Related Vulnerabilities

Same product: Cisco Meraki MX Firmware
Same vendor: Cisco

V. Comments for CVE-2022-20933

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