A vulnerability in the bootloader of Cisco IOS XE Software for Cisco Catalyst 9200 Series Switches, Cisco Catalyst ESS9300 Embedded Series Switches, Cisco Catalyst IE9310 and IE9320 Rugged Series Switches, and Cisco IE3500 and IE3505 Rugged Series Switches could allow an authenticated, local attacker with level-15 privileges or an unauthenticated attacker with physical access to an affected device to execute arbitrary code at boot time and break the chain of trust. This vulnerability is due to insufficient validation of software at boot time.
An attacker could exploit this vulnerability by manipulating the loaded binaries on an affected device to bypass some of the integrity checks that are performed during the boot process. A successful exploit could allow the attacker to execute code that bypasses the requirement to run Cisco-signed images. Cisco has assigned this security advisory a Security Impact Rating (SIR) of High rather than Medium as the score indicates because this vulnerability allows an attacker to bypass a major security feature of a device.
With a CVSS score of 6.1, this vulnerability is classified as medium severity. Organizations utilizing the affected switches should evaluate the potential risks associated with this vulnerability and prioritize remediation efforts.
Risk to organizations includes the potential for unauthorized access and execution of arbitrary code, which could compromise the security of network operations. Organizations should address in priority patch cycle.
Vulnerability Details
The vulnerability in the bootloader of Cisco IOS XE Software allows for unauthorized code execution. This issue specifically affects the following products: Cisco Catalyst 9200 Series Switches, Cisco Catalyst ESS9300 Embedded Series Switches, Cisco Catalyst IE9310 and IE9320 Rugged Series Switches, and Cisco IE3500 and IE3505 Rugged Series Switches.
The CVSS score of 6.1 indicates a medium severity level, reflecting the potential impact on confidentiality and integrity, both rated as high. The attack vector is physical, with low complexity involved, and privileges required are none. User interaction is also not required.
This vulnerability was published on March 25, 2026, and is classified under CWE-124, indicating a weakness related to insufficient validation.
Technical Analysis
The root cause of this vulnerability lies in the insufficient validation of software at boot time, which allows an attacker to manipulate binaries loaded onto the device. The attack vector is physical, meaning the attacker must have direct access to the device, and the complexity of the attack is low.
No privileges are required to exploit this vulnerability, making it a significant risk, especially in environments where physical security may be lax. User interaction is not necessary, which further increases the risk of exploitation.
If successful, the attacker could gain high confidentiality and integrity impact, allowing for unauthorized modifications to the system, while availability remains unaffected.
Risk & Impact Analysis
The real-world deployment risk associated with this vulnerability is substantial, particularly for organizations that rely on the affected Cisco switches for secure network operations. The ability to execute arbitrary code at boot time undermines the integrity of the device and could lead to widespread security breaches.
Considering the potential blast radius, organizations must understand that a single compromised device could lead to further exploits across the network. Urgency for remediation is high, given the nature of the vulnerability and the potential for exploitation.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions prior to vendor patch for Cisco IOS XE Software affecting the following products: Cisco Catalyst 9200 Series Switches, Cisco Catalyst ESS9300 Embedded Series Switches, Cisco Catalyst IE9310 and IE9320 Rugged Series Switches, and Cisco IE3500 and IE3505 Rugged Series Switches.
Mitigation & Remediation
Organizations should prioritize patching immediately. It is essential to apply the latest vendor patches to mitigate this vulnerability. In the absence of a patch, consider implementing configuration hardening and restricting physical access to affected devices.
For further assistance, organizations can utilize penetration testing services to assess their security posture.
Detection Guidance
Monitor logs for any anomalies during the boot process, especially related to unauthorized code execution. Look for unusual changes in device configurations or firmware integrity checks that may indicate exploitation attempts.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability highlights the need for robust security practices in the management of network devices. Organizations must remain vigilant against physical security risks that could lead to similar vulnerabilities in the future.
Security teams should analyze their existing security controls and ensure they include physical security assessments as part of their overall strategy. Regular reviews of security features and the implementation of best practices can mitigate risks.
For further insights into security practices, organizations can refer to our resources on penetration testing methodology and security testing best practices to enhance their security posture.
Additionally, organizations should stay updated with the latest trends regarding vulnerabilities and security measures.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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