What is the CVSS score of CVE-2026-20012?

CVE-2026-20012 has a CVSS 3.1 base score of 8.6 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H. EPSS exploitation probability: 0.1%.

Which versions of Cisco are affected by CVE-2026-20012?

A high-severity memory leak vulnerability in Cisco IKEv2 implementations poses denial-of-service risk to organizations operating Cisco routers, ASA firewalls, and Threat Defense appliances.

How to fix or mitigate CVE-2026-20012?

Within 24 hours: inventory all Cisco IOS, IOS XE, ASA, and FTD devices and confirm affected versions against Cisco's advisory; enable syslog alerting for unexpected device reloads and memory exhaustion warnings. Within 7 days: implement network segmentation to restrict IKEv2 access to trusted sources only and disable IKEv2 on non-essential devices; establish incident response runbooks for rapid device recovery. Within 30 days: evaluate Cisco's security patches as they become available and establish a phased deployment schedule; consider alternative VPN endpoints or vendors for critical remote access if patches remain unavailable.

Cisco CVE-2026-20012

EUVD-2026-15428 HIGH

Memory Leak (CWE-401)

2026-03-25 cisco

Cisco Denial Of Service Microsoft Apple

8.6

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

8.6 HIGH

AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

EUVD ID Assigned

Mar 25, 2026 - 16:16 euvd

EUVD-2026-15428

Analysis Generated

Mar 25, 2026 - 16:16 vuln.today

CVE Published

Mar 25, 2026 - 16:03 nvd

HIGH 8.6

DescriptionCVE.org

A vulnerability in the Internet Key Exchange version 2 (IKEv2) feature of Cisco IOS Software, Cisco IOS XE Software, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to trigger a memory leak, resulting in a denial of service (DoS) condition on an affected device. This vulnerability is due to improper parsing of IKEv2 packets. An attacker could exploit this vulnerability by sending crafted IKEv2 packets to an affected device. A successful exploit of Cisco IOS Software and IOS XE Software could allow the attacker to cause the affected device to reload, resulting in a DoS condition. A successful exploit of Cisco Secure Firewall ASA Software and Secure FTD Software could allow the attacker to partially exhaust system memory, resulting in system instability, such as the inability to establish new IKEv2 VPN sessions. A manual reboot of the device is required to recover from this condition.