CVE-2026-107242: Versa VOS vulnerability
The Node.js web service on VOS (previously Versa FlexVNF) is used for URL-based Zero Touch Provisioning (ZTP) of the VOS appliance and is not required after provisioning is complete. This service generates session identifiers using UUID version 1 (UUIDv1), which is derived from the system’s date and time and its MAC address. As a result, successive identifiers differ only slightly and can be predicted. An attacker who can predict a user’s session ID could hijack that user’s session.
Versa’s security hardening guide for Hubs, Branches, and Controllers recommends disabling the Node.js web service after the initial provisioning of the VOS device. This vulnerability is not exploitable on VOS devices where the Node.js web service has been disabled.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Configuration
Disable the Node.js web service after initial provisioning of the VOS appliance.
Node.js web service on VOS service status = disabled
Event History
Frequently Asked Questions
Which deployments are exposed to session hijacking?
VOS devices are exposed only while the Node.js web service used for URL-based Zero Touch Provisioning remains enabled. Devices where that service has been disabled are not exploitable through this issue.
What must an attacker do to exploit this issue?
The attacker must predict a user's session identifier, which may be possible because the service generates UUIDv1 session IDs derived from system time and MAC address. A successfully predicted session ID could allow the attacker to hijack that user's session.
What mitigation is available if the service is no longer needed?
Disable the Node.js web service after initial VOS provisioning is complete. Versa's hardening guidance recommends this for Hubs, Branches, and Controllers.