CVE-2026-107244
CVE-2026-107244
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 /decryptTest endpoint of this service is registered in server.js before the session authentication middleware and creates an authenticated session whenever it receives a token that decrypts successfully. Because the key and initialization vector (IV) used for decryption are hardcoded and identical across all VOS appliances, an unauthenticated attacker with network access can compute a valid token, submit it to /decryptTest, and obtain a fully authenticated session without providing any credentials. 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.
Fixes and workarounds
Workaround
The mitigation is to disable the Nodejs web service on the VOS. Instructions to disable the Nodejs web service are available on the Versa documentation page at the below link: https://docs.versa-networks.com/Integrations_and_Solutions/System_Hardening/Perform_Manual_Hardening_for_Versa_Branches%2C_Controllers%2C_and_Hubs#Enable_Secure_Mode
Source: CNA: hackeroneAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| VOS Versa |
≥ 21.1.1; ≤ 21.2.3 (affected, semver) ≥ 22.1.2; < July 2, 2026 (affected, semver) ≥ 22.1.3; < July 2, 2026 (affected, semver) ≥ 22.1.4; < July 2, 2026 (affected, semver) ≥ 23.1.2; < July 2, 2026 (affected, semver) ≥ 22.1.2 July-2-2026-Hotfix; < 22.1.2 July-2-2026-Hotfix (unaffected, semver) ≥ 22.1.3 July-2-2026-Hotfix; < 22.1.3 July-2-2026-Hotfix (unaffected, semver) ≥ 22.1.4 July-2-2026-Hotfix; < 22.1.4 July-2-2026-Hotfix (unaffected, semver) ≥ 23.1.2 Aug-3-2026-Hotfix; < 23.1.2 Aug-3-2026-Hotfix (unaffected, semver) |
CNA: hackerone |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.0 / 7.6 high |
CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H | CNA: hackerone |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
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