Vulnerability · Published Dec 31, 2025 · Assigned by VulnCheck
CVE-2021-47740KZTech JT3500V 4G LTE CPE 2.0.1 Insufficient Session Expiration Vulnerability
High 7.5
In plain English
A high-severity security flaw in AM3000M from KZ Broadband Technologies, Ltd.. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.4%top 63.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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 products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| KZ Broadband Technologies, Ltd. | JT3500V | 2.0.1B10642.0.1B1047 |
| KZ Broadband Technologies, Ltd. | AM6200M | 2.0.0B3210 |
| KZ Broadband Technologies, Ltd. | AM6000N | 2.0.0B3042 |
| KZ Broadband Technologies, Ltd. | AM5000W | 2.0.0B3037 |
| KZ Broadband Technologies, Ltd. | AM4200M | 2.0.0B2996 |
| KZ Broadband Technologies, Ltd. | AM4100V | 2.0.0B2988 |
| KZ Broadband Technologies, Ltd. | AM3500MW | 2.0.0B1092 |
| KZ Broadband Technologies, Ltd. | AM3410V | 2.0.0B1085 |
| KZ Broadband Technologies, Ltd. | AM3300V | 2.0.0B1060 |
| KZ Broadband Technologies, Ltd. | AM3100E | 2.0.0B981 |
| KZ Broadband Technologies, Ltd. | AM3100V | 2.0.0B946 |
| KZ Broadband Technologies, Ltd. | AM3000M | 2.0.0B21 |
| KZ Broadband Technologies, Ltd. | KZ7621U | 2.0.0B14 |
| KZ Broadband Technologies, Ltd. | KZ3220M | 2.0.0B04 |
| KZ Broadband Technologies, Ltd. | KZ3120R | 2.0.0B01 |
Weakness: CWE-613 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
References
- Zero Science Lab Disclosure (ZSL-2021-5646) third-party-advisory
- Packet Storm Security Exploit Entry exploit
- IBM X-Force Vulnerability Exchange Entry vdb-entry
- KZ TECH Vendor Homepage product
- JATON TEC Homepage product
- Neotel Vendor Homepage product
- VulnCheck Advisory: KZTech JT3500V 4G LTE CPE 2.0.1 Insufficient Session Expiration Vulnerability third-party-advisory