CVE-2024-20501
Multiple vulnerabilities in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series Teleworker Gateway devices could allow an unauthenticated, remote attacker to cause a DoS condition in the AnyConnect service on an affected device.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.51%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Multiple vulnerabilities in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series Teleworker Gateway devices could allow an unauthenticated, remote attacker to cause a DoS condition in the AnyConnect service on an affected device. These vulnerabilities are due to insufficient validation of client-supplied parameters while establishing an SSL VPN session. An attacker could exploit these vulnerabilities by sending a crafted HTTPS request to the VPN server of an affected device. A successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to restart, resulting in the failure of the established SSL VPN connections and forcing remote users to initiate a new VPN connection and reauthenticate. 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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.51% probability · 42th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-787
- Affected
- cisco/meraki mx65 firmware · cisco/meraki mx64 firmware · cisco/meraki z4c firmware · cisco/meraki z4 firmware · cisco/meraki z3c firmware · cisco/meraki z3 firmware · cisco/meraki vmx firmware · cisco/meraki mx600 firmware · cisco/meraki mx450 firmware · cisco/meraki mx400 firmware · cisco/meraki mx250 firmware · cisco/meraki mx105 firmware · cisco/meraki mx100 firmware · cisco/meraki mx95 firmware · cisco/meraki mx85 firmware · cisco/meraki mx84 firmware · cisco/meraki mx75 firmware · cisco/meraki mx68w firmware · cisco/meraki mx68cw firmware · cisco/meraki mx68 firmware · +5 more
- Source
- psirt@cisco.com
References
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.