CVE-2025-20334 in IOS XE
Summary
by MITRE • 09/24/2025
A vulnerability in the HTTP API subsystem of Cisco IOS XE Software could allow a remote attacker to inject commands that will execute with root privileges into the underlying operating system.
This vulnerability is due to insufficient input validation. An attacker with administrative privileges could exploit this vulnerability by authenticating to an affected system and performing an API call with crafted input. Alternatively, an unauthenticated attacker could persuade a legitimate user with administrative privileges who is currently logged in to the system to click a crafted link. A successful exploit could allow the attacker to execute arbitrary commands as the root user.
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Analysis
by VulDB Data Team • 09/25/2025
This vulnerability resides within the HTTP API subsystem of Cisco IOS XE Software, representing a critical command injection flaw that could enable remote code execution with elevated privileges. The issue stems from inadequate input validation mechanisms that fail to properly sanitize or filter user-supplied data before processing. According to CWE-94, this vulnerability manifests as an insufficient input validation weakness that allows attackers to inject malicious commands into the system. The vulnerability affects the underlying operating system of Cisco IOS XE devices, which operates on a Linux-based kernel, making it susceptible to arbitrary command execution through carefully crafted API requests. The attack vector is particularly concerning because it can be exploited through multiple pathways, including authenticated and unauthenticated scenarios.
The technical exploitation of this vulnerability occurs through the HTTP API subsystem where user input is not adequately validated or sanitized before being processed. When an attacker successfully crafts API calls with malicious input, the system fails to properly validate the data, allowing command injection payloads to be executed within the operating system context. This flaw specifically targets the API processing logic that handles HTTP requests, where the system does not properly distinguish between legitimate user input and potentially harmful command sequences. The vulnerability can be triggered through authenticated access where an attacker uses administrative credentials to make API calls, or through social engineering techniques where unauthenticated attackers trick legitimate users into clicking malicious links that contain the crafted payloads.
The operational impact of this vulnerability is severe as it provides attackers with root-level privileges on the affected systems, effectively granting complete control over the network infrastructure. This privilege escalation capability enables attackers to execute arbitrary commands, modify system configurations, access sensitive data, and potentially establish persistent backdoors within the network. The attack surface is expanded by the fact that the vulnerability can be exploited through both authenticated and unauthenticated means, making it particularly dangerous in environments where administrative access might be compromised or where social engineering attacks are prevalent. Organizations using affected Cisco IOS XE software could face complete system compromise, data breaches, and potential network infiltration that could affect multiple connected devices.
Mitigation strategies should focus on immediate patch management and network segmentation to limit potential damage. Cisco has released security advisories and patches that address this vulnerability, requiring organizations to update their systems promptly to prevent exploitation. Network administrators should implement strict input validation controls at the API level and consider disabling unnecessary API endpoints to reduce attack surface. The mitigation approach aligns with ATT&CK technique T1059.001 for command and scripting interpreter and T1068 for exploit for privilege escalation. Organizations should also deploy intrusion detection systems to monitor for suspicious API activity and implement multi-factor authentication for administrative access. Additionally, regular security assessments and vulnerability scanning should be conducted to identify and remediate similar weaknesses in network infrastructure components.