CVE-2021-45036
CVE-2021-45036 is a high-severity vulnerability in Velneo Vclient with a CVSS 3.x base score of 8.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.
Key facts
- Severity: High (CVSS 3.x base score 8.7)
- EPSS exploit prediction: 1% (49th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-287
- Affected product: Velneo Vclient
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2021-45036?
- 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.
- How severe is CVE-2021-45036?
- CVE-2021-45036 has a CVSS 3.x base score of 8.7, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
- Is CVE-2021-45036 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-45036?
- CVE-2021-45036 affects Velneo Vclient. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-45036?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2021-45036 published?
- CVE-2021-45036 was published on 2022-11-28 and last updated on 2026-06-17.
References
- https://doc.velneo.com/v/32/velneo-vserver/funcionalidades/protocolo-vatps
- https://doc.velneo.com/v/32/velneo/funcionalidades-comunes/conexion-con-velneo-vserver
- 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/notas-de-la-version#mejoras-de-seguridad-en-validacion-de-usuario-y-contrasena
- https://velneo.es/mivelneo/listado-de-cambios-velneo-32/
- 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
Affected products (1)
- cpe:2.3:a:velneo:vclient:28.1.3:*:*:*:*:*:*:*
More vulnerabilities in Velneo Vclient
- CVE-2021-45035 — Medium (CVSS 6.3): Velneo vClient on its 28.1.3 version, does not correctly check the certificate of authenticity by default. This could…
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Other CWE-287 (Improper Authentication) vulnerabilities
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- CVE-2026-47280 — Critical (CVSS 10.0): Improper authentication in Azure Resource Manager (ARM) allows an unauthorized attacker to elevate privileges over a…
- CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
- CVE-2026-20182 — Critical (CVSS 10.0): May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and…
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