CVE-2025-20212

Description

A vulnerability in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series devices could allow an authenticated, remote attacker to cause a denial of service (DoS) condition in the Cisco AnyConnect service on an affected device. To exploit this vulnerability, the attacker must have valid VPN user credentials on the affected device. This vulnerability exists because a variable is not initialized when an SSL VPN session is established. An attacker could exploit this vulnerability by supplying crafted attributes while establishing an SSL VPN session with 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 sessions 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 without manual intervention.

Category

7.7
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.12%
Affected: Cisco Cisco Meraki MX Firmware
Published at:
Updated at:

References

Frequently Asked Questions

What is the severity of CVE-2025-20212?
CVE-2025-20212 has been scored as a high severity vulnerability.
How to fix CVE-2025-20212?
To fix CVE-2025-20212, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-20212 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-20212 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-20212?
CVE-2025-20212 affects Cisco Cisco Meraki MX Firmware.
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