CVE-2026-20012

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.

CVSS v3 8.6 HIGH

8.6^/10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 4.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope CHANGED

References

Link	Resource
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ftd-ios-dos-kPEpQGGK

Configurations

No configuration.

History

17 Jun 2026, 10:16

Type	Values Removed	Values Added
Summary		(es) Una vulnerabilidad en la función de Intercambio de Claves de Internet versión 2 (IKEv2) de Cisco IOS Software, Cisco IOS XE Software, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software y Cisco Secure Firewall Threat Defense (FTD) Software podría permitir a un atacante remoto no autenticado activar una fuga de memoria, lo que resultaría en una condición de denegación de servicio (DoS) en un dispositivo afectado. Esta vulnerabilidad se debe a un análisis incorrecto de los paquetes IKEv2. Un atacante podría explotar esta vulnerabilidad enviando paquetes IKEv2 manipulados a un dispositivo afectado. Un exploit exitoso de Cisco IOS Software y IOS XE Software podría permitir al atacante provocar que el dispositivo afectado se reinicie, lo que resultaría en una condición de DoS. Un exploit exitoso de Cisco Secure Firewall ASA Software y Secure FTD Software podría permitir al atacante agotar parcialmente la memoria del sistema, lo que resultaría en inestabilidad del sistema, como la incapacidad de establecer nuevas sesiones VPN IKEv2. Se requiere un reinicio manual del dispositivo para recuperarse de esta condición.

25 Mar 2026, 16:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-03-25 16:16

Updated : 2026-06-17 10:16

NVD link : CVE-2026-20012

Mitre link : CVE-2026-20012

CVE.ORG link : CVE-2026-20012

JSON object : View

Products Affected

No product.

CWE

CWE-401

Missing Release of Memory after Effective Lifetime

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"affected", "version": "6.2.3.4"}, {"status": "affected", "version": "6.2.3.5"}, {"status": "affected", "version": "6.2.3.6"}, {"status": "affected", "version": "6.2.3.7"}, {"status": "affected", "version": "6.2.3.8"}, {"status": "affected", "version": "6.2.3.10"}, {"status": "affected", "version": "6.2.3.11"}, {"status": "affected", "version": "6.2.3.9"}, {"status": "affected", "version": "6.2.3.12"}, {"status": "affected", "version": "6.2.3.13"}, {"status": "affected", "version": "6.2.3.14"}, {"status": "affected", "version": "6.2.3.15"}, {"status": "affected", "version": "6.2.3.16"}, {"status": "affected", "version": "6.2.3.17"}, {"status": "affected", "version": "6.2.3.18"}, {"status": "affected", "version": "6.6.0"}, {"status": "affected", "version": "6.6.0.1"}, {"status": "affected", "version": "6.6.1"}, {"status": "affected", "version": "6.6.3"}, {"status": "affected", "version": "6.6.4"}, {"status": "affected", "version": "6.6.5"}, {"status": "affected", "version": "6.6.5.1"}, {"status": "affected", "version": "6.6.5.2"}, {"status": "affected", "version": "6.6.7"}, {"status": "affected", "version": "6.6.7.1"}, {"status": "affected", "version": "6.6.7.2"}, {"status": "affected", "version": "6.4.0"}, {"status": "affected", "version": "6.4.0.1"}, {"status": "affected", "version": "6.4.0.3"}, {"status": "affected", "version": "6.4.0.2"}, {"status": "affected", "version": "6.4.0.4"}, {"status": "affected", "version": "6.4.0.5"}, {"status": "affected", "version": "6.4.0.6"}, {"status": "affected", "version": "6.4.0.7"}, {"status": "affected", "version": "6.4.0.8"}, {"status": "affected", "version": "6.4.0.9"}, {"status": "affected", "version": "6.4.0.10"}, {"status": "affected", "version": "6.4.0.11"}, {"status": "affected", "version": "6.4.0.12"}, {"status": "affected", "version": "6.4.0.13"}, {"status": "affected", "version": "6.4.0.14"}, {"status": "affected", "version": "6.4.0.15"}, {"status": "affected", "version": "6.4.0.16"}, {"status": "affected", "version": "6.4.0.17"}, {"status": "affected", "version": "6.4.0.18"}, {"status": "affected", "version": "7.0.0"}, {"status": "affected", "version": "7.0.0.1"}, {"status": "affected", "version": "7.0.1"}, {"status": "affected", "version": "7.0.1.1"}, {"status": "affected", "version": "7.0.2"}, {"status": "affected", "version": "7.0.2.1"}, {"status": "affected", "version": "7.0.3"}, {"status": "affected", "version": "7.0.4"}, {"status": "affected", "version": "7.0.5"}, {"status": "affected", "version": "7.0.6"}, {"status": "affected", "version": "7.0.6.1"}, {"status": "affected", "version": "7.0.6.2"}, {"status": "affected", "version": "7.0.6.3"}, {"status": "affected", "version": "7.0.7"}, {"status": "affected", "version": "7.0.8"}, {"status": "affected", "version": "7.0.8.1"}, {"status": "affected", "version": "7.1.0"}, {"status": "affected", "version": "7.1.0.1"}, {"status": "affected", "version": "7.1.0.2"}, {"status": "affected", "version": "7.1.0.3"}, {"status": "affected", "version": "7.2.0"}, {"status": "affected", "version": "7.2.0.1"}, {"status": "affected", "version": "7.2.1"}, {"status": "affected", "version": "7.2.2"}, {"status": "affected", "version": "7.2.3"}, {"status": "affected", "version": "7.2.4"}, {"status": "affected", "version": "7.2.4.1"}, {"status": "affected", "version": "7.2.5"}, {"status": "affected", "version": "7.2.5.1"}, {"status": "affected", "version": "7.2.6"}, {"status": "affected", "version": "7.2.7"}, {"status": "affected", "version": "7.2.5.2"}, {"status": "affected", "version": "7.2.8"}, {"status": "affected", "version": "7.2.8.1"}, {"status": "affected", "version": "7.2.9"}, {"status": "affected", "version": "7.2.10"}, {"status": "affected", "version": "7.2.10.2"}, {"status": "affected", "version": "7.3.0"}, {"status": "affected", "version": "7.3.1"}, {"status": "affected", "version": "7.3.1.1"}, {"status": "affected", "version": "7.3.1.2"}, {"status": "affected", "version": "7.4.0"}, {"status": "affected", "version": "7.4.1"}, {"status": "affected", "version": "7.4.1.1"}, {"status": "affected", "version": "7.4.2"}, {"status": "affected", "version": "7.4.2.1"}, {"status": "affected", "version": "7.4.2.2"}, {"status": "affected", "version": "7.4.2.3"}, {"status": "affected", "version": "7.4.2.4"}, {"status": "affected", "version": "7.6.0"}, {"status": "affected", "version": "7.6.1"}, {"status": "affected", "version": "7.6.2"}, {"status": "affected", "version": "7.6.2.1"}, {"status": "affected", "version": "7.7.0"}, {"status": "affected", "version": "7.7.10"}, {"status": "affected", "version": "7.7.10.1"}]}]}], "published": "2026-03-25T16:16:10.957", "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ftd-ios-dos-kPEpQGGK", "source": "psirt@cisco.com"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "psirt@cisco.com", "description": [{"lang": "en", "value": "CWE-401"}]}], "descriptions": [{"lang": "en", "value": "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.\r\n\r 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."}, {"lang": "es", "value": "Una vulnerabilidad en la funci\u00f3n de Intercambio de Claves de Internet versi\u00f3n 2 (IKEv2) de Cisco IOS Software, Cisco IOS XE Software, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software y Cisco Secure Firewall Threat Defense (FTD) Software podr\u00eda permitir a un atacante remoto no autenticado activar una fuga de memoria, lo que resultar\u00eda en una condici\u00f3n de denegaci\u00f3n de servicio (DoS) en un dispositivo afectado.\nEsta vulnerabilidad se debe a un an\u00e1lisis incorrecto de los paquetes IKEv2. Un atacante podr\u00eda explotar esta vulnerabilidad enviando paquetes IKEv2 manipulados a un dispositivo afectado. Un exploit exitoso de Cisco IOS Software y IOS XE Software podr\u00eda permitir al atacante provocar que el dispositivo afectado se reinicie, lo que resultar\u00eda en una condici\u00f3n de DoS. Un exploit exitoso de Cisco Secure Firewall ASA Software y Secure FTD Software podr\u00eda permitir al atacante agotar parcialmente la memoria del sistema, lo que resultar\u00eda en inestabilidad del sistema, como la incapacidad de establecer nuevas sesiones VPN IKEv2. Se requiere un reinicio manual del dispositivo para recuperarse de esta condici\u00f3n."}], "lastModified": "2026-06-17T10:16:52.720", "sourceIdentifier": "psirt@cisco.com"}