CVE-2022-20933

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

1.1% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2022-10-26 15:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 04:25 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.1% in the next 30 days (EPSS).
• Severity: 8.6 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2022-10-26 15:15 UTC

Last modified

2026-06-17 04:25 UTC

Exploit probability

1.1% · EPSS, next 30 days

Weakness

CWE-234

Record status

Modified

Affected

• Cisco Meraki mx64 Firmware < 16.16.6
• Cisco Meraki mx64 Firmware < 17.10.1
• Cisco Meraki mx64w Firmware < 16.16.6
• Cisco Meraki mx64w Firmware < 17.10.1
• Cisco Meraki mx65 Firmware < 16.16.6
• Cisco Meraki mx65 Firmware < 17.10.1
• Cisco Meraki mx65w Firmware < 16.16.6
• Cisco Meraki mx65w Firmware < 17.10.1

Attack profile CVSS 3.1 · 8.6

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2022-20933.md and follow it. Check whether this project is affected by CVE-2022-20933. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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