CVE-2026-33272 in 700
Summary
by MITRE • 10/09/2026
A malicious user with physical access to the device can boot the switch from factory settings without authentication, use the default administrative credentials to obtain administrative access, and save changes to the configuration file so that they persist next time the switch boots normally.
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Analysis
by VulDB Data Team • 10/09/2026
The vulnerability described represents a critical failure in the secure boot process and physical security controls of network switching hardware, allowing an attacker with direct physical access to bypass authentication mechanisms entirely. This flaw enables unauthorized individuals to reset the device configuration to its factory defaults without requiring any form of credential verification or administrative privilege. By exploiting this weakness, an adversary can effectively erase custom configurations, including complex firewall rules, VLAN assignments, and access control lists that were previously established by legitimate administrators. The core technical issue lies in the lack of physical security safeguards during the boot sequence, where the system fails to verify the integrity of the bootloader or enforce authentication before allowing a configuration reset operation. This type of vulnerability is often categorized under CWE-284 Improper Access Control and CWE-359 Exposure of Private Information to an Unauthorized Actor, as it allows for the complete compromise of device state through physical proximity rather than remote exploitation.
Once the switch has been booted from factory settings using default administrative credentials, the attacker gains full control over the network infrastructure connected to that port or segment. The ability to save these changes ensures that the malicious configuration persists across reboots, meaning the compromised state is not temporary but permanent until manually corrected by a legitimate administrator who may be unaware of the tampering. This persistence mechanism significantly increases the severity of the incident, as it creates a backdoor that survives power cycles and routine maintenance operations. The operational impact includes potential denial of service due to misconfigured network parameters, interception of traffic if routing tables are altered, or complete loss of visibility into network activities because logging mechanisms may be disabled during the factory reset process. Such an attack vector is particularly dangerous in environments where physical access controls are lax, such as open server rooms, unsecured branch offices, or public-facing equipment installations without locked enclosures.
From a threat intelligence perspective, this behavior aligns with techniques observed in advanced persistent threats and insider attacks documented in the MITRE ATT&CK framework, specifically under Initial Access via Physical Interaction and Defense Evasion through System Configuration Modification. Attackers often leverage physical access to bypass logical security controls that are otherwise robust against remote network-based exploits. The use of default credentials further exacerbates the risk, as it indicates a failure in secure deployment practices where vendors or administrators have not changed pre-configured passwords upon initial setup. This combination of weak authentication and persistent configuration changes allows for long-term unauthorized access and potential lateral movement within the internal network topology.
Mitigation strategies must focus on both physical security enhancements and logical hardening measures. Organizations should implement strict physical access controls, such as locked server rooms, biometric scanners, or surveillance systems to prevent unauthorized individuals from reaching network hardware. Additionally, administrators must ensure that all default credentials are changed immediately upon device deployment and that secure boot mechanisms are enabled if supported by the vendor firmware. Regular audits of configuration files can help detect unauthorized changes early, while enabling logging for administrative actions provides an audit trail to identify when such resets occur. Firmware updates should be applied promptly as vendors may release patches addressing these physical security gaps in future releases. Ultimately, treating physical access as equivalent to root-level privilege is essential for maintaining the integrity and confidentiality of network infrastructure components.