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This CVE record has been updated after NVD enrichment efforts were completed. Enrichment data supplied by the NVD may require amendment due to these changes.
Current Description
A vulnerability 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 for targeted users of the AnyConnect service on an affected device.
This vulnerability is due to insufficient entropy for handlers that are used during SSL VPN session establishment. An unauthenticated attacker could exploit this vulnerability by brute forcing valid session handlers. An authenticated attacker could exploit this vulnerability by connecting to the AnyConnect VPN service of an affected device to retrieve a valid session handler and, based on that handler, predict further valid session handlers. The attacker would then send a crafted HTTPS request using the brute-forced or predicted session handler to the AnyConnect VPN server of the device. A successful exploit could allow the attacker to terminate targeted SSL VPN sessions, forcing remote users to initiate new VPN connections and reauthenticate.
A vulnerability 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 for targeted users of the AnyConnect service on an affected device.
This vulnerability is due to insufficient entropy for handlers that are used during SSL VPN session establishment. An unauthenticated attacker could exploit this vulnerability by brute forcing valid session handlers. An authenticated attacker could exploit this vulnerability by connecting to the AnyConnect VPN service of an affected device to retrieve a valid session handler and, based on that handler, predict further valid session handlers. The attacker would then send a crafted HTTPS request using the brute-forced or predicted session handler to the AnyConnect VPN server of the device. A successful exploit could allow the attacker to terminate targeted SSL VPN sessions, forcing remote users to initiate new VPN connections and reauthenticate.
Metrics
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CVE Modified by Cisco Systems, Inc.6/04/2025 5:15:37 PM
Action
Type
Old Value
New Value
Changed
Description
A vulnerability 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 for targeted users of the AnyConnect service on an affected device.
This vulnerability is due to insufficient entropy for handlers that are used during SSL VPN session establishment. An unauthenticated attacker could exploit this vulnerability by brute forcing valid session handlers. An authenticated attacker could exploit this vulnerability by connecting to the AnyConnect VPN service of an affected device to retrieve a valid session handler and, based on that handler, predict further valid session handlers. The attacker would then send a crafted HTTPS request using the brute-forced or predicted session handler to the AnyConnect VPN server of the device. A successful exploit could allow the attacker to terminate targeted SSL VPN sessions, forcing remote users to initiate new VPN connections and reauthenticate.
A vulnerability 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 for targeted users of the AnyConnect service on an affected device.
This vulnerability is due to insufficient entropy for handlers that are used during SSL VPN session establishment. An unauthenticated attacker could exploit this vulnerability by brute forcing valid session handlers. An authenticated attacker could exploit this vulnerability by connecting to the AnyConnect VPN service of an affected device to retrieve a valid session handler and, based on that handler, predict further valid session handlers. The attacker would then send a crafted HTTPS request using the brute-forced or predicted session handler to the AnyConnect VPN server of the device. A successful exploit could allow the attacker to terminate targeted SSL VPN sessions, forcing remote users to initiate new VPN connections and reauthenticate.
Initial Analysis by NIST10/08/2024 5:16:54 PM
Action
Type
Old Value
New Value
Added
CVSS V3.1
NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Added
CWE
NIST CWE-639
Added
CPE Configuration
AND
OR
*cpe:2.3:o:cisco:meraki_mx100_firmware:*:*:*:*:*:*:*:* versions from (including) 16.2 up to (excluding) 18.211.2
OR
cpe:2.3:h:cisco:meraki_mx100:-:*:*:*:*:*:*:*
Added
CPE Configuration
AND
OR
*cpe:2.3:o:cisco:meraki_mx105_firmware:*:*:*:*:*:*:*:* versions from (including) 16.2 up to (excluding) 18.211.2
OR
cpe:2.3:h:cisco:meraki_mx105:-:*:*:*:*:*:*:*
Added
CPE Configuration
AND
OR
*cpe:2.3:o:cisco:meraki_mx250_firmware:*:*:*:*:*:*:*:* versions from (including) 16.2 up to (excluding) 18.211.2
OR
cpe:2.3:h:cisco:meraki_mx250:-:*:*:*:*:*:*:*
Added
CPE Configuration
AND
OR
*cpe:2.3:o:cisco:meraki_mx400_firmware:*:*:*:*:*:*:*:* versions from (including) 16.2 up to (excluding) 18.211.2
OR
cpe:2.3:h:cisco:meraki_mx400:-:*:*:*:*:*:*:*
Added
CPE Configuration
AND
OR
*cpe:2.3:o:cisco:meraki_mx450_firmware:*:*:*:*:*:*:*:* versions from (including) 16.2 up to (excluding) 18.211.2
OR
cpe:2.3:h:cisco:meraki_mx450:-:*:*:*:*:*:*:*
Added
CPE Configuration
AND
OR
*cpe:2.3:o:cisco:meraki_mx600_firmware:*:*:*:*:*:*:*:* versions from (including) 16.2 up to (excluding) 18.211.2
OR
cpe:2.3:h:cisco:meraki_mx600:-:*:*:*:*:*:*:*
Added
CPE Configuration
AND
OR
*cpe:2.3:o:cisco:meraki_mx64_firmware:*:*:*:*:*:*:*:* versions from (including) 17.6.0 up to (excluding) 18.211.2
OR
cpe:2.3:h:cisco:meraki_mx64:-:*:*:*:*:*:*:*
Added
CPE Configuration
AND
OR
*cpe:2.3:o:cisco:meraki_mx64w_firmware:*:*:*:*:*:*:*:* versions from (including) 16.2 up to (excluding) 18.211.2
OR
cpe:2.3:h:cisco:meraki_mx64w:-:*:*:*:*:*:*:*
Added
CPE Configuration
AND
OR
*cpe:2.3:o:cisco:meraki_mx65_firmware:*:*:*:*:*:*:*:* versions from (including) 17.6.0 up to (excluding) 18.211.2
OR
cpe:2.3:h:cisco:meraki_mx65:-:*:*:*:*:*:*:*
Added
CPE Configuration
AND
OR
*cpe:2.3:o:cisco:meraki_mx65w_firmware:*:*:*:*:*:*:*:* versions from (including) 16.2 up to (excluding) 18.211.2
OR
cpe:2.3:h:cisco:meraki_mx65w:-:*:*:*:*:*:*:*
Added
CPE Configuration
AND
OR
*cpe:2.3:o:cisco:meraki_mx67_firmware:*:*:*:*:*:*:*:* versions from (including) 16.2 up to (excluding) 18.211.2
OR
cpe:2.3:h:cisco:meraki_mx67:-:*:*:*:*:*:*:*
Added
CPE Configuration
AND
OR
*cpe:2.3:o:cisco:meraki_mx67c_firmware:*:*:*:*:*:*:*:* versions from (including) 16.2 up to (excluding) 18.211.2
OR
cpe:2.3:h:cisco:meraki_mx67c:-:*:*:*:*:*:*:*
Added
CPE Configuration
AND
OR
*cpe:2.3:o:cisco:meraki_mx67w_firmware:*:*:*:*:*:*:*:* versions from (including) 16.2 up to (excluding) 18.211.2
OR
cpe:2.3:h:cisco:meraki_mx67w:-:*:*:*:*:*:*:*
Added
CPE Configuration
AND
OR
*cpe:2.3:o:cisco:meraki_mx68_firmware:*:*:*:*:*:*:*:* versions from (including) 16.2 up to (excluding) 18.211.2
OR
cpe:2.3:h:cisco:meraki_mx68:-:*:*:*:*:*:*:*
Added
CPE Configuration
AND
OR
*cpe:2.3:o:cisco:meraki_mx68cw_firmware:*:*:*:*:*:*:*:* versions from (including) 16.2 up to (excluding) 18.211.2
OR
cpe:2.3:h:cisco:meraki_mx68cw:-:*:*:*:*:*:*:*
Added
CPE Configuration
AND
OR
*cpe:2.3:o:cisco:meraki_mx68w_firmware:*:*:*:*:*:*:*:* versions from (including) 16.2 up to (excluding) 18.211.2
OR
cpe:2.3:h:cisco:meraki_mx68w:-:*:*:*:*:*:*:*
Added
CPE Configuration
AND
OR
*cpe:2.3:o:cisco:meraki_mx75_firmware:*:*:*:*:*:*:*:* versions from (including) 16.2 up to (excluding) 18.211.2
OR
cpe:2.3:h:cisco:meraki_mx75:-:*:*:*:*:*:*:*
Added
CPE Configuration
AND
OR
*cpe:2.3:o:cisco:meraki_mx84_firmware:*:*:*:*:*:*:*:* versions from (including) 16.2 up to (excluding) 18.211.2
OR
cpe:2.3:h:cisco:meraki_mx84:-:*:*:*:*:*:*:*
Added
CPE Configuration
AND
OR
*cpe:2.3:o:cisco:meraki_mx85_firmware:*:*:*:*:*:*:*:* versions from (including) 16.2 up to (excluding) 18.211.2
OR
cpe:2.3:h:cisco:meraki_mx85:-:*:*:*:*:*:*:*
Added
CPE Configuration
AND
OR
*cpe:2.3:o:cisco:meraki_mx95_firmware:*:*:*:*:*:*:*:* versions from (including) 16.2 up to (excluding) 18.211.2
OR
cpe:2.3:h:cisco:meraki_mx95:-:*:*:*:*:*:*:*
Added
CPE Configuration
AND
OR
*cpe:2.3:o:cisco:meraki_vmx_firmware:*:*:*:*:*:*:*:* versions from (including) 16.2 up to (excluding) 18.211.2
OR
cpe:2.3:h:cisco:meraki_vmx:-:*:*:*:*:*:*:*
Added
CPE Configuration
AND
OR
*cpe:2.3:o:cisco:meraki_z3_firmware:*:*:*:*:*:*:*:* versions from (including) 16.2 up to (excluding) 18.211.2
OR
cpe:2.3:h:cisco:meraki_z3:-:*:*:*:*:*:*:*
Added
CPE Configuration
AND
OR
*cpe:2.3:o:cisco:meraki_z3c_firmware:*:*:*:*:*:*:*:* versions from (including) 16.2 up to (excluding) 18.211.2
OR
cpe:2.3:h:cisco:meraki_z3c:-:*:*:*:*:*:*:*
Added
CPE Configuration
AND
OR
*cpe:2.3:o:cisco:meraki_z4_firmware:*:*:*:*:*:*:*:* versions from (including) 16.2 up to (excluding) 18.211.2
OR
cpe:2.3:h:cisco:meraki_z4:-:*:*:*:*:*:*:*
Added
CPE Configuration
AND
OR
*cpe:2.3:o:cisco:meraki_z4c_firmware:*:*:*:*:*:*:*:* versions from (including) 16.2 up to (excluding) 18.211.2
OR
cpe:2.3:h:cisco:meraki_z4c:-:*:*:*:*:*:*:*
Changed
Reference Type
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-meraki-mx-vpn-dos-QTRHzG2 No Types Assigned
New CVE Received from Cisco Systems, Inc.10/02/2024 3:15:15 PM
Action
Type
Old Value
New Value
Added
Description
A vulnerability 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 for targeted users of the AnyConnect service on an affected device.
This vulnerability is due to insufficient entropy for handlers that are used during SSL VPN session establishment. An unauthenticated attacker could exploit this vulnerability by brute forcing valid session handlers. An authenticated attacker could exploit this vulnerability by connecting to the AnyConnect VPN service of an affected device to retrieve a valid session handler and, based on that handler, predict further valid session handlers. The attacker would then send a crafted HTTPS request using the brute-forced or predicted session handler to the AnyConnect VPN server of the device. A successful exploit could allow the attacker to terminate targeted SSL VPN sessions, forcing remote users to initiate new VPN connections and reauthenticate.
Added
CVSS V3.1
Cisco Systems, Inc. AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
Added
CWE
Cisco Systems, Inc. CWE-639
Added
Reference
Cisco Systems, Inc. https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-meraki-mx-vpn-dos-QTRHzG2 [No types assigned]
Quick Info
CVE Dictionary Entry: CVE-2024-20513 NVD
Published Date: 10/02/2024 NVD
Last Modified: 06/17/2026
Source: Cisco Systems, Inc.
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