medium
5.8
CWE
639
Advisory Published
Updated

CVE-2024-20513: Cisco Meraki MX and Z3 Teleworker Gateway AnyConnect VPN Targeted Denial of Service Vulnerability

First published: Wed Oct 02 2024(Updated: )

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.

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
All of
Cisco Meraki Mx65 Firmware>=17.6.0<18.211.2
Cisco Meraki Mx65
All of
Cisco Meraki Mx64 Firmware>=17.6.0<18.211.2
Cisco Meraki Mx64
All of
Cisco Meraki Z4c Firmware>=16.2<18.211.2
Cisco Meraki Z4c
All of
Cisco Meraki Z4 Firmware>=16.2<18.211.2
Cisco Meraki Z4
All of
Cisco Meraki Z3c Firmware>=16.2<18.211.2
Cisco Meraki Z3c
All of
Cisco Meraki Z3 Firmware>=16.2<18.211.2
Cisco Meraki Z3
All of
Cisco Meraki Vmx Firmware>=16.2<18.211.2
Cisco Meraki Vmx
All of
Cisco Meraki Mx600 Firmware>=16.2<18.211.2
Cisco Meraki Mx600
All of
Cisco Meraki Mx450 Firmware>=16.2<18.211.2
Cisco Meraki Mx450
All of
Cisco Meraki Mx400 Firmware>=16.2<18.211.2
Cisco Meraki Mx400
All of
Cisco Meraki Mx250 Firmware>=16.2<18.211.2
Cisco Meraki Mx250
All of
Cisco Meraki Mx105 Firmware>=16.2<18.211.2
Cisco Meraki Mx105
All of
Cisco Meraki Mx100 Firmware>=16.2<18.211.2
Cisco Meraki Mx100
All of
Cisco Meraki Mx95 Firmware>=16.2<18.211.2
Cisco Meraki Mx95
All of
Cisco Meraki Mx85 Firmware>=16.2<18.211.2
Cisco Meraki Mx85
All of
Cisco Meraki Mx84 Firmware>=16.2<18.211.2
Cisco Meraki Mx84
All of
Cisco Meraki Mx75 Firmware>=16.2<18.211.2
Cisco Meraki Mx75
All of
Cisco Meraki Mx68w Firmware>=16.2<18.211.2
Cisco Meraki Mx68w
All of
Cisco Meraki Mx68cw Firmware>=16.2<18.211.2
Cisco Meraki Mx68cw
All of
Cisco Meraki Mx68 Firmware>=16.2<18.211.2
Cisco Meraki Mx68
All of
Cisco Meraki Mx67w Firmware>=16.2<18.211.2
Cisco Meraki Mx67w
All of
Cisco Meraki Mx67c Firmware>=16.2<18.211.2
Cisco Meraki Mx67c
All of
Cisco Meraki Mx67 Firmware>=16.2<18.211.2
Cisco Meraki Mx67
All of
Cisco Meraki Mx65w Firmware>=16.2<18.211.2
Cisco Meraki Mx65w
All of
Cisco Meraki Mx64w Firmware>=16.2<18.211.2
Cisco Meraki Mx64w

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Read MoreStart Free Trial

Reference Links

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2024 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203