CVE-2024-20500 Denial of service in Cisco Meraki MX Firmware
Unauthenticated remote attackers can cause a denial of service in the Cisco AnyConnect VPN server by sending crafted TLS/SSL messages, blocking new connections.
- 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-2024-20500?
CVE-2024-20500 is a medium-severity denial of service 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 cause a DoS condition in the AnyConnect service on an affected device.
This vulnerability is due to insufficient resource management when establishing TLS/SSL sessions. An attacker could exploit this vulnerability by sending a series of crafted TLS/SSL messages to the VPN server of an affected device. A successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to stop accepting new connections, preventing new SSL VPN connections from being established. Existing SSL VPN sessions are not impacted.
Note: When the attack traffic stops, the Cisco AnyConnect VPN server recovers gracefully without requiring manual intervention.
Weakness: CWE-400
Which versions are affected by CVE-2024-20500?
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-2024-20500?
No fix has been published for CVE-2024-20500 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2024-20500 being exploited?
There is no known exploitation of CVE-2024-20500 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-2024-20502 Denial of service in Cisco Meraki MX Firmware
Sources
Also known as GHSA-7pgw-6p7m-45vf.