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.
Published 2022-10-26 15:15:15
Updated 2022-10-31 17:40:05
View at NVD,   CVE.org
Vulnerability category: Denial of service

Exploit prediction scoring system (EPSS) score for CVE-2022-20933

0.14%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 49 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2022-20933

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
8.6
HIGH CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
3.9
4.0
Cisco Systems, Inc.
8.6
HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
3.9
4.0
NIST

CWE ids for CVE-2022-20933

  • If too few arguments are sent to a function, the function will still pop the expected number of arguments from the stack. Potentially, a variable number of arguments could be exhausted in a function as well.
    Assigned by: ykramarz@cisco.com (Secondary)

References for CVE-2022-20933

Products affected by CVE-2022-20933

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