CVE-2012-0360 in IOS
Summary
by MITRE
Memory leak in Cisco IOS before 15.1(1)SY, when IKEv2 debugging is enabled, allows remote attackers to cause a denial of service (memory consumption) via crafted packets, aka Bug ID CSCtn22376.
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Analysis
by VulDB Data Team • 05/11/2026
The vulnerability identified as CVE-2012-0360 represents a critical memory leak flaw within Cisco IOS operating systems prior to version 15.1(1)SY. This issue specifically manifests when Internet Key Exchange version 2 IKEv2 debugging functionality is enabled on affected devices, creating a pathway for remote attackers to exploit the system's memory management mechanisms. The vulnerability operates through a sophisticated manipulation of network packet structures that triggers improper memory allocation and subsequent failure to release allocated memory segments, ultimately leading to progressive memory exhaustion.
The technical exploitation of this vulnerability occurs through the careful crafting of specially designed packets that are processed by the IKEv2 debugging subsystem. When these malformed packets are received by an affected Cisco IOS device with IKEv2 debugging enabled, the system's memory allocation routines become corrupted, causing memory segments to be allocated without proper subsequent deallocation. This memory leak accumulates over time as attackers continuously send these crafted packets, gradually consuming available system memory resources until the device becomes unresponsive and experiences complete denial of service. The vulnerability is particularly dangerous because it requires minimal network access and can be executed remotely without authentication, making it highly attractive to attackers seeking to disrupt network services.
The operational impact of this vulnerability extends beyond simple service disruption to encompass potential network infrastructure instability and business continuity risks. Organizations relying on Cisco IOS devices for critical network operations face significant exposure when this vulnerability exists in their environments, as the memory consumption can escalate rapidly and may require manual intervention to restore normal device functionality. The vulnerability affects a broad range of Cisco IOS products and is particularly concerning because the debugging functionality is often enabled in production environments for troubleshooting purposes, creating a persistent attack surface that can be exploited by adversaries with minimal technical expertise. This issue directly maps to CWE-401, which describes improper handling of memory allocation and deallocation, and aligns with ATT&CK technique T1499.004 for network denial of service attacks.
Mitigation strategies for CVE-2012-0360 require immediate implementation of several protective measures to safeguard affected network infrastructure. The most effective immediate solution involves disabling IKEv2 debugging functionality on all affected Cisco IOS devices, as this eliminates the attack vector entirely. Network administrators should also implement access control measures to restrict network access to only authorized sources that require debugging capabilities, while monitoring for unusual packet patterns that may indicate exploitation attempts. Additionally, organizations should prioritize upgrading their Cisco IOS software to version 15.1(1)SY or later, which contains the necessary patches to address the memory leak vulnerability. Network segmentation and intrusion detection systems can provide additional layers of protection by monitoring for suspicious packet traffic patterns associated with this specific vulnerability. The implementation of these mitigations should be prioritized based on the criticality of affected devices and the potential impact of service disruption on business operations, with particular attention to core network infrastructure components where the vulnerability could cause cascading failures across the entire network ecosystem.