CVE-2025-20313 in IOS XE
Summary
by MITRE • 09/24/2025
Multiple vulnerabilities in Cisco IOS XE Software of could allow an authenticated, local attacker with level-15 privileges or an unauthenticated attacker with physical access to the device to execute persistent code at boot time and break the chain of trust.
These vulnerabilities are due path traversal and improper image integrity validation. A successful exploit could allow the attacker to execute persistent code on the underlying operating system.
Because this allows the attacker to bypass a major security feature of the device, Cisco has raised the Security Impact Rating (SIR) of this advisory from Medium to High.
For more information about these vulnerabilities, see the Details ["#details"] section of this advisory.
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Analysis
by VulDB Data Team • 09/25/2025
The vulnerability identified as CVE-2025-20313 represents a critical security flaw in Cisco IOS XE Software that fundamentally undermines the device's boot-time security mechanisms. This vulnerability stems from two primary technical weaknesses: path traversal exploits and inadequate image integrity validation processes. The combination of these flaws creates a persistent threat vector that allows attackers to execute malicious code during the device's boot sequence, effectively compromising the system's trust model from the earliest stages of operation. The security implications are particularly severe because the attack can be executed either through authenticated access with level-15 privileges or through unauthenticated physical access, significantly broadening the attack surface and reducing the barriers to exploitation.
The technical exploitation of CVE-2025-20313 leverages path traversal mechanisms to manipulate the software update and boot processes, while simultaneously bypassing critical image validation checks that are designed to ensure only legitimate firmware components execute on the device. This dual approach creates a persistent backdoor that survives device reboots and system updates, fundamentally breaking the chain of trust that is essential for maintaining device security. The vulnerability affects the underlying operating system execution environment, allowing attackers to gain unauthorized code execution capabilities that persist across system restarts. This type of attack directly violates the principle of least privilege and undermines the security architecture that Cisco IOS XE Software is designed to enforce, making it particularly dangerous for network infrastructure devices that require high availability and security guarantees.
The operational impact of this vulnerability extends far beyond simple code execution, as it enables attackers to establish persistent footholds within network infrastructure that can remain undetected for extended periods. The elevated security impact rating from Medium to High reflects the severity of the compromise, as this vulnerability allows attackers to bypass critical security features that are fundamental to device integrity. Network administrators face significant challenges in detecting such attacks since they occur during the boot process and can manipulate the device's security validation mechanisms. The vulnerability's potential for widespread network disruption is substantial, as compromised devices can serve as entry points for broader network attacks, lateral movement, and data exfiltration operations. Organizations must consider the implications for their entire network security posture, as the compromise of a single device with these characteristics can potentially affect multiple network segments.
Mitigation strategies for CVE-2025-20313 must address both the immediate exploitation vectors and the underlying architectural weaknesses that enable the attack. Organizations should implement immediate access controls to limit physical access to network devices and enforce strict authentication requirements for administrative access. The security community should prioritize patch management procedures and validate firmware integrity through multiple verification mechanisms before deployment. Additionally, network monitoring solutions should be enhanced to detect anomalous boot behaviors and unexpected code execution patterns that may indicate exploitation attempts. The vulnerability aligns with ATT&CK techniques related to bootkits and persistence mechanisms, specifically targeting the system boot process and rootkit creation capabilities. Organizations should also consider implementing hardware security modules and secure boot features that can provide additional layers of protection against these types of attacks. The remediation process requires careful coordination between security teams and network operations to ensure that device integrity is maintained throughout the update and verification process, as any gaps in the mitigation strategy could leave systems vulnerable to continued exploitation.