CVE-2021-47740 json
KZTech JT3500V 4G LTE CPE 2.0.1 Insufficient Session Expiration Vulnerability
published 2025-12-31 10 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-206077
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 36%
- public exploits
- 0
- none known
Summary
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.
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 10 mo ago
Exploit prediction
0.42% chance of exploitation in the next 30 days, higher than 36% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- packetstormsecurity.com https://packetstormsecurity.com/files/161892/ referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 6.9 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N |
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| CNA | 4.0 | 6.9 | CVSS: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 |
Affected products
- KZ Broadband Technologies, Ltd. JT3500V
- KZ Broadband Technologies, Ltd. AM6200M
- KZ Broadband Technologies, Ltd. AM6000N
- KZ Broadband Technologies, Ltd. AM5000W
- KZ Broadband Technologies, Ltd. AM4200M
- KZ Broadband Technologies, Ltd. AM4100V
- KZ Broadband Technologies, Ltd. AM3500MW
- KZ Broadband Technologies, Ltd. AM3410V
- KZ Broadband Technologies, Ltd. AM3300V
- KZ Broadband Technologies, Ltd. AM3100E
- KZ Broadband Technologies, Ltd. AM3100V
- KZ Broadband Technologies, Ltd. AM3000M
- KZ Broadband Technologies, Ltd. KZ7621U
- KZ Broadband Technologies, Ltd. KZ3220M
- KZ Broadband Technologies, Ltd. KZ3120R
Classification
- Weakness
-
- CWE-613 DEPRECATED: Insufficient Session Expiration
References
-
packetstormsecurity.com
/files/161892/
exploit
-
zeroscience.mk
/en/vulnerabilities/ZSL-2021-5646.php
third-party-advisory
-
exchange.xforce.ibmcloud.com
/vulnerabilities/198471
vdb-entry
-
kzbtech.com
/
product
-
jatontech.com
/
product
-
neotel.mk
/
product
-
vulncheck.com
/advisories/kztech-jtv-g-lte-cpe-insufficient-session-expiration-vulnerability
third-party-advisory
Sources
- CVE List CVE-2021-47740
- NVD CVE-2021-47740
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.