CVE-2021-47740 KZTech JT3500V 4G LTE CPE 2.0.1 Insufficient Session Expiration Vulnerability
Attackers can reuse expired session credentials to maintain unauthorized access to KZTech 4G LTE CPE devices.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-47740?
CVE-2021-47740 is a medium-severity authentication bypass vulnerability in KZ Broadband Technologies, Ltd. AM3000M, published on 31 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-613
Which versions are affected by CVE-2021-47740?
How do I fix CVE-2021-47740?
No fix has been published for CVE-2021-47740 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2021-47740 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47740 exists.
Sources
Also known as GHSA-x9rg-7xj6-v2x6.