CVE-2025-20271 — Use of Uninitialized Variable in Cisco Meraki MX Firmware
Severity
8.6HIGHNVD
EPSS
0.2%
top 61.53%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedJun 18
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 denial of service (DoS) condition in the Cisco AnyConnect service on an affected device.
This vulnerability is due to variable initialization errors when an SSL VPN session is established. An attacker could exploit this vulnerability by sending a sequence of crafted HTTPS requests to an affected device. A successful…
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:HExploitability: 3.9 | Impact: 4.0
Affected Packages1 packages
🔴Vulnerability Details
2CVEList▶
Cisco Meraki MX and Z Series AnyConnect VPN with Client Certificate Authentication Denial of Service Vulnerability↗2025-06-18
GHSA▶
GHSA-m673-qg9w-p8mh: A vulnerability in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series Teleworker Gateway devices could allow an unauthentica↗2025-06-18
📋Vendor Advisories
1Cisco▶
Cisco Meraki MX and Z Series AnyConnect VPN with Client Certificate Authentication Denial of Service Vulnerability↗2025-06-18