Security readout for executives and security teams
CVE-2021-47740 is an insufficient session expiration issue affecting KZ Broadband Technologies JT3500V and multiple related AM/KZ device firmware versions listed in the source bundle. Old session credentials may remain usable longer than they should, allowing unauthorized continued access if an attacker obtains or reuses a prior session. Exposure is most relevant for affected KZ Broadband Technologies devices running the listed firmware versions, especially where the device management interface is reachable over an untrusted network. Affected products in the bundle include JT3500V 2.0.1B1064 and 2.0.1B1047, plus listed AM6200M, AM6000N, AM5000W, AM4200M, AM4100V, AM3500MW, AM3410V, AM3300V, AM3100E, AM3100V, AM3000M, KZ7621U, KZ3220M, and KZ3120R firmware builds. Treat as a high-priority perimeter/network-device risk if affected devices are internet-facing or reachable from broad internal networks. Prioritize exposure reduction immediately while confirming vendor remediation options. Mitigation focus: Identify whether any affected KZ Broadband Technologies products and firmware versions are deployed.; Check vendor or device-provider guidance for fixed firmware or supported remediation; patch evidence is not included in the provided bundle.; Restrict management interfaces to trusted administrative networks or VPN-only access..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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Open ATT&CK lookupCVE-2021-47740 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CNA and ADP enrichment extracted from CVE v5
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CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- Zero Science Lab Disclosure (ZSL-2021-5646)CVE reference · third-party-advisory
- Packet Storm Security Exploit EntryCVE reference · exploit
- IBM X-Force Vulnerability Exchange EntryCVE reference · vdb-entry
- JATON TEC HomepageCVE reference · product
- Neotel Vendor HomepageCVE reference · product
- VulnCheck Advisory: KZTech JT3500V 4G LTE CPE 2.0.1 Insufficient Session Expiration VulnerabilityCVE reference · third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Insufficient Session Expiration
Insufficient Session Expiration represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.