CVE-2024-20509 Race condition in Cisco Meraki MX Firmware
An unauthenticated remote attacker can hijack AnyConnect VPN sessions or cause denial of service by exploiting weak entropy and a race condition in the authentication process.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2024-20509?
CVE-2024-20509 is a medium-severity vulnerability in Cisco Meraki MX Firmware, published on 2 Oct 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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 hijack an AnyConnect VPN session or cause a denial of service (DoS) condition for individual users of the AnyConnect VPN service on an affected device. This vulnerability is due to weak entropy for handlers that are used during the VPN authentication process as well as a race condition that exists in the same process. An attacker could exploit this vulnerability by correctly guessing an authentication handler and then sending crafted HTTPS requests to an affected device. A successful exploit could allow the attacker to take over the AnyConnect VPN session from a target user or prevent the target user from establishing an AnyConnect VPN session with the affected device.
Weakness: CWE-362
Which versions are affected by CVE-2024-20509?
It affects 25 products.
Products include Cisco Meraki Mx100 Firmware, Cisco Meraki Mx105 Firmware, Cisco Meraki Mx250 Firmware, Cisco Meraki Mx400 Firmware, Cisco Meraki Mx450 Firmware, Cisco Meraki Mx600 Firmware and 19 more.
How do I fix CVE-2024-20509?
No fix has been published for CVE-2024-20509 yet. Limit exposure of the affected software until one is available.
Is CVE-2024-20509 being exploited?
There is no known exploitation of CVE-2024-20509 in the wild and no public exploit code.
Other vulnerabilities in Cisco Meraki MX Firmware
- CVE-2024-20498 Denial of service in Cisco Meraki MX Firmware
- CVE-2024-20499 Denial of service in Cisco Meraki MX Firmware
- CVE-2024-20501 Denial of service in Cisco Meraki MX Firmware
- CVE-2022-20933 Cisco Meraki MX and Z3 Teleworker Gateway VPN Denial of Service Vulnerability
- CVE-2024-20500 Denial of service in Cisco Meraki MX Firmware
Sources
Also known as GHSA-frxm-f6qg-2mch.