Versa VOS up to 21.2.3 Zero Touch Provisioning child_process.exec username/password os command injection

Summaryinfo

A vulnerability identified as very critical has been detected in Versa VOS up to 21.2.3. This vulnerability affects the function child_process.exec of the component Zero Touch Provisioning. Performing a manipulation of the argument username/password results in os command injection. This vulnerability is identified as CVE-2026-107240. The attack can be initiated remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Versa VOS up to 21.2.3. It has been classified as very critical. This affects the function child_process.exec of the component Zero Touch Provisioning. The manipulation of the argument username/password with an unknown input leads to a os command injection vulnerability. CWE is classifying the issue as CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command before it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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. The /authenticate endpoint of this service passes user-supplied username and password values to child_process.exec() through a sanitizer (escapeRegExp) that removes regular expression metacharacters but not newline characters. An unauthenticated attacker can inject a newline character into the username field to execute arbitrary shell commands as the versa OS service user. No credentials are required; the attacker needs only a CSRF token, which can be obtained from an unauthenticated page load.  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.

It is possible to read the advisory at security-portal.versa-networks.com. This vulnerability is uniquely identified as CVE-2026-107240 since 10/07/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/10/2026). The attack technique deployed by this issue is T1202 according to MITRE ATT&CK.

Upgrading to version 22.1.2, 22.1.3, 22.1.4 or 23.1.2 eliminates this vulnerability.

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Vendor

• Versa

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• VOS

Version

• 21.2.0
• 21.2.1
• 21.2.2
• 21.2.3

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