CVE-2025-20198 in IOS XE
Summary
by MITRE • 05/07/2025
A vulnerability in the CLI of Cisco IOS XE Software could allow an authenticated, local attacker with privilege level 15 to elevate privileges to root on the underlying operating system of an affected device.
This vulnerability is due to insufficient input validation when processing specific configuration commands. An attacker could exploit this vulnerability by including crafted input in specific configuration commands. A successful exploit could allow the attacker to elevate privileges to root on the underlying operating system of an affected device. The security impact rating (SIR) of this advisory has been raised to High because an attacker could gain access to the underlying operating system of the affected device and perform potentially undetected actions.
Note: The attacker must have privileges to enter configuration mode on the affected device. This is usually referred to as privilege level 15.
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Analysis
by VulDB Data Team • 07/08/2025
This vulnerability resides within the command line interface of Cisco IOS XE Software, representing a critical privilege escalation flaw that directly impacts the security posture of network infrastructure devices. The vulnerability specifically affects authenticated local attackers who possess privilege level 15 access, which typically corresponds to the highest administrative privileges within the IOS XE environment. This classification aligns with CWE-20, which addresses "Improper Input Validation," as the flaw stems from inadequate sanitization of user inputs during configuration command processing. The security impact rating has been elevated to High due to the potential for complete system compromise, as successful exploitation grants attackers root-level access to the underlying operating system, effectively providing them with unrestricted control over the device's core functions and data.
The technical mechanism behind this vulnerability involves insufficient input validation when processing specific configuration commands that are designed to modify system-level parameters. Attackers can craft malicious inputs that bypass normal validation checks, allowing them to inject arbitrary commands or manipulate system configurations in ways that should be restricted. This type of vulnerability represents a classic privilege escalation vector where legitimate administrative functionality is abused to gain elevated privileges. The flaw demonstrates a failure in the principle of least privilege enforcement, where the system does not adequately verify or sanitize inputs before executing potentially dangerous operations. According to ATT&CK framework, this vulnerability maps to T1068 (Local Port Forwarding) and T1548.002 (Abuse Elevation Control Mechanism) as attackers can leverage their existing administrative access to escalate privileges to root level. The configuration commands that trigger this vulnerability likely interact with system-level processes or kernel interfaces that are not properly protected against malformed inputs.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with complete control over the affected device's underlying operating system. Once elevated to root privileges, attackers can modify system files, install malicious software, access all device data, and potentially use the compromised device as a launch point for further attacks within the network. The ability to perform "potentially undetected actions" suggests that the compromised device could serve as a persistent backdoor or command and control node without immediate detection by network monitoring systems. This vulnerability particularly affects enterprise network infrastructure where Cisco IOS XE devices serve as core routing, switching, or wireless access points, making it a significant concern for organizations relying on these platforms for their network operations. The impact is amplified because privilege level 15 access is typically restricted to authorized administrators, but if such credentials are compromised through social engineering, insider threats, or credential theft, the vulnerability becomes immediately exploitable.
Mitigation strategies should focus on immediate patch management and operational security enhancements to prevent exploitation. Organizations must prioritize applying the relevant Cisco security patches as soon as they become available, as these updates will address the input validation deficiencies in the affected CLI commands. Network administrators should also implement additional monitoring for unusual configuration changes or command execution patterns that might indicate exploitation attempts. The principle of least privilege should be strictly enforced, ensuring that only authorized personnel have access to privilege level 15 accounts, and that multi-factor authentication is implemented for all administrative access. Additionally, implementing network segmentation and access controls can limit the potential damage if an attacker successfully exploits this vulnerability. Security teams should conduct thorough audits of administrative access logs to identify any suspicious activities that might indicate attempted exploitation, while also considering the implementation of privileged access management solutions to better control and monitor administrative activities on affected devices.