A vulnerability in the DHCP snooping feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to a crafted IPv4 DHCP request packet being mishandled when endpoint analytics are enabled. An attacker could exploit this vulnerability by sending a crafted DHCP request through an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition. Note: The attack vector is listed as network because a DHCP relay anywhere on the network could allow exploits from networks other than the adjacent one.
The severity of this vulnerability is classified as high with a CVSS score of 8.6, indicating a significant risk to affected organizations. The potential for device reloads poses a serious disruption, particularly in environments reliant on continuous network availability. Organizations should prioritize patching immediately.
As of now, there are no known public exploits available, which provides a temporary window of opportunity for organizations to address this vulnerability before it can be exploited in the wild. However, the potential for future exploitation remains, making it critical for defenders to act swiftly.
Cisco has provided guidance on remediation in their advisory, urging affected users to update to the latest versions of IOS XE to mitigate this vulnerability.
Vulnerability Details
CVE-2024-20259 is classified as a denial of service vulnerability due to its impact on device availability. The vulnerability exists in the DHCP snooping feature of Cisco IOS XE, which is utilized to prevent malicious DHCP servers from providing incorrect IP addresses to clients. The vulnerability allows an attacker to send a specially crafted DHCP request, leading to an unexpected device reload. The CVSS score of 8.6 underscores its high severity, emphasizing the importance of timely remediation.
Technical Analysis
The root cause of this vulnerability lies in the mishandling of crafted DHCP request packets by the DHCP snooping feature when endpoint analytics are enabled. Attackers may leverage this vulnerability by sending malicious DHCP requests over the network, resulting in an unexpected reload of the affected device. This vulnerability has a low attack complexity rating, as no special privileges or user interaction are required to exploit it. The impacts include high availability risk, as the device may become temporarily unavailable, disrupting network services.
Risk & Impact Analysis
Risk to organizations includes significant disruptions due to device reloads, potentially impacting business operations and service availability. The blast radius may extend to multiple users or services relying on the affected device, underscoring the urgency for organizations to address this vulnerability in their patch management processes. Given the CVSS score of 8.6 and the potential impact on availability, organizations should address this vulnerability in priority patch cycle.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions of Cisco IOS XE prior to the latest patch are affected. Organizations should ensure their devices are updated to secure versions to mitigate the risk of exploitation.
Mitigation & Remediation
To address this vulnerability, organizations should immediately apply the latest patches provided by Cisco. Additionally, they should implement network controls to monitor and restrict unauthorized DHCP requests. For effective remediation, consider utilizing penetration testing to validate the security posture and ensure that all vulnerabilities are addressed effectively.
Detection Guidance
Organizations should monitor logs for unusual DHCP request patterns and unexpected device reloads. Behavioral anomalies in network traffic may indicate attempts to exploit this vulnerability. Additionally, network signatures should be established to detect crafted DHCP packets.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2024-20259 is tied to its potential impact on network infrastructure stability. As organizations increasingly depend on network devices for critical operations, any vulnerability that can lead to a DoS condition warrants immediate attention. This incident underscores the importance of maintaining a robust vulnerability management program, including regular updates and security assessments. Security teams should learn from this vulnerability to enhance their defensive strategies against similar threats. For ongoing insights, organizations can benefit from reviewing our comprehensive vulnerability management program and adopting best practices around network security.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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