CVE-2021-47740 - CVE House
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Status published Medium CVE-2021-47740

KZTech JT3500V 4G LTE CPE 2.0.1 Insufficient Session Expiration Vulnerability

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • LiquidWorm as Gjoko Krstic of Zero Science Lab

Affected Vendor

KZ Broadband Technologies, Ltd.

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Affected Software

JT3500V, AM6200M, AM6000N, AM5000W, AM4200M, AM4100V, AM3500MW, AM3410V, AM3300V, AM3100E, AM3100V, AM3000M, KZ7621U, KZ3220M, KZ3120R
Vulnerable Versions:
2.0.1B1064, 2.0.1B1047, 2.0.0B3210, 2.0.0B3042, 2.0.0B3037, 2.0.0B2996, 2.0.0B2988, 2.0.0B1092, 2.0.0B1085, 2.0.0B1060, 2.0.0B981, 2.0.0B946, 2.0.0B21, 2.0.0B14, 2.0.0B04, 2.0.0B01

Timeline

Official Publish: December 31st, 2025
Last Modified: January 2nd, 2026
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Weaknesses (CWE)