CVE-2025-20212
published 2025-04-02CVE-2025-20212: 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…
PriorityP343high7.7CVSS 3.1
AVNACLPRLUINSCCNINAH
EPSS
0.69%
52.4th percentile
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.
Affected
15 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| cisco | cisco_meraki_mx_firmware | — | — |
| cisco | cisco_meraki_mx_firmware | — | — |
| cisco | cisco_meraki_mx_firmware | — | — |
| cisco | cisco_meraki_mx_firmware | — | — |
| cisco | cisco_meraki_mx_firmware | — | — |
| cisco | cisco_meraki_mx_firmware | — | — |
| cisco | cisco_meraki_mx_firmware | — | — |
| cisco | cisco_meraki_mx_firmware | — | — |
| cisco | cisco_meraki_mx_firmware | — | — |
| cisco | cisco_meraki_mx_firmware | — | — |
| cisco | cisco_meraki_mx_firmware | — | — |
| cisco | cisco_meraki_mx_firmware | — | — |
| cisco | cisco_meraki_mx_firmware | — | — |
| cisco | cisco_meraki_mx_firmware | — | — |
| cisco | meraki_mx_and_z_series_anyconnect_vpn | — | — |
CVSS provenance
nvdv3.17.7HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
vendor_cisco7.7HIGH
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
Cisco
Cisco Meraki MX and Z Series AnyConnect VPN Denial of Service Vulnerability
vendor_cisco·2025-04-02·CVSS 7.7
CVE-2025-20212 [HIGH] CWE-457 Cisco Meraki MX and Z Series AnyConnect VPN Denial of Service Vulnerability
Cisco Meraki MX and Z Series AnyConnect VPN Denial of Service Vulnerability
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
Cisco
Cisco Meraki MX and Z Series AnyConnect VPN Denial of Service Vulnerability
vendor_cisco·CVSS 3.1
CVE-2025-20212 Cisco Meraki MX and Z Series AnyConnect VPN Denial of Service Vulnerability
CVE-2025-20212: Cisco Meraki MX and Z Series AnyConnect VPN Denial of Service Vulnerability
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
GHSA
GHSA-mf93-68c7-8cg2: A vulnerability in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series devices could allow an authenticated, remote attacker
ghsa_unreviewed·2025-04-02
CVE-2025-20212 [HIGH] CWE-457 GHSA-mf93-68c7-8cg2: A vulnerability in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series devices could allow an authenticated, remote attacker
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 n
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2025-04-02
Published