CVE-2021-47740

KZTech JT3500V 4G LTE CPE 2.0.1 Insufficient Session Expiration Vulnerability

HIGH
7.5
CVSS Score
Published: December 31, 2025 at 06:40 PM UTC
Updated: June 17, 2026 at 04:18 AM UTC
15 products affected across 1 vendorAM3500MWKZ7621UKZ3220M

Using JT3500V by KZ Broadband Technologies, Ltd.?

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Severity
HIGH7.5
Exploit prediction
EPSS 0.4%
SSVC
PoC

Description

KZTech JT3500V 4G LTE CPE 2.0.1 contains a session management vulnerability that allows attackers to reuse old session credentials without proper expiration. Attackers can exploit the weak session handling to maintain unauthorized access and potentially compromise device authentication mechanisms.

Affected

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHVulnCheck
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-613

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