CVE-2022-20933
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.03%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 8.6 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- EPSS
- 1.03% probability · 62th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-234
- Affected
- cisco/meraki mx64 firmware · cisco/meraki mx64w firmware · cisco/meraki mx65 firmware · cisco/meraki mx65w firmware · cisco/meraki mx67 firmware · cisco/meraki mx67cw firmware · cisco/meraki mx67w firmware · cisco/meraki mx68 firmware · cisco/meraki mx68cw firmware · cisco/meraki mx68w firmware · cisco/meraki mx75 firmware · cisco/meraki mx84 firmware · cisco/meraki mx85 firmware · cisco/meraki mx95 firmware · cisco/meraki mx100 firmware · cisco/meraki mx105 firmware · cisco/meraki mx250 firmware · cisco/meraki mx400 firmware · cisco/meraki mx450 firmware · cisco/meraki mx600 firmware · +3 more
- Source
- psirt@cisco.com
References
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.