CVE-2021-47740

KZTech JT3500V 4G LTE CPE 2.0.1 Insufficient Session Expiration Vulnerability

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

KZ Broadband Technologies, Ltd. · JT3500V · AM6200M · AM6000N · AM5000W · AM4200M · AM4100V

CVSS v4.0 VULNCHECK

6.9 MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 VULNCHECK

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS

0.42% chance of exploitation in the next 30 days, 35th percentile

Published

2025-12-31

Updated

2026-01-02

Proof-of-concept exploits (1)

• https://packetstormsecurity.com/files/161892/

References

• CVE Record
• NVD entry