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CVE-2025-20271

Meraki MX and Z Series - Cisco AnyConnect VPN server

Cisco CVSS 8.6 Updated March 16, 2026

Executive Risk Summary

"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 denial of service (DoS) condition. This vulnerability is due to variable initialization errors when an SSL VPN session is established, and a successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to restart, resulting in the failure of all established SSL VPN sessions."

Operational Audit Arsenal

Target Type Firmware Image
Target Asset Cisco AnyConnect VPN server
Standard Path Global Firmware

Manual Verification Required

This is a non-Windows asset (Cisco). Use the target asset details and official path provided above to verify your current version against the official vendor advisories listed below.

Patch Impact Forecast

Reboot Required Likely

High, as a sustained attack could prevent new SSL VPN connections from being established

Internal Work Notes

CVE-2025-20271: Unauthenticated DoS vulnerability in Cisco AnyConnect VPN server of Meraki MX and Z Series devices, requiring firmware update to prevent service disruption

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Related Cisco Threats

Data compiled from NVD, MSRC, and CISA KEV Catalog. Intelligence synthesized via AI. Scripts provided for diagnostic purposes under MIT License.