What is the CVSS score of CVE-2021-47663?

CVE-2021-47663 has a CVSS 3.1 base score of 8.1 (High). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.3%.

How to fix or mitigate CVE-2021-47663?

Within 7 days: Identify all affected systems and apply vendor patches promptly. Monitor vendor channels for patch availability.

CVE-2021-47663

HIGH

Insufficient Session Expiration (CWE-613)

2025-04-24 info@cert.vde.com

Information Disclosure

8.1

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

8.1 HIGH

AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 18:38 vuln.today

CVE Published

Apr 24, 2025 - 10:15 nvd

HIGH 8.1

DescriptionCVE.org

Due to improper JSON Web Tokens implementation an unauthenticated remote attacker can guess a valid session ID and therefore impersonate a user to gain full access.

AnalysisAI

Due to improper JSON Web Tokens implementation an unauthenticated remote attacker can guess a valid session ID and therefore impersonate a user to gain full access. Rated high severity (CVSS 8.1), this vulnerability is remotely exploitable, no authentication required. No vendor patch available.

Technical ContextAI

This vulnerability is classified under CWE-613. Due to improper JSON Web Tokens implementation an unauthenticated remote attacker can guess a valid session ID and therefore impersonate a user to gain full access.

Affected ProductsAI

See vendor advisory for affected versions.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.