Vulnerability · CVE-2021-47740
KZTech JT3500V 4G LTE CPE 2.0.1 contains a session management vulnerability that allows attackers to reuse old session credentials without proper expiration.
Published Dec 31, 2025 · catalog updated Jan 2, 2026 · KZ Broadband Technologies, Ltd. AM6000N
Last checked Nov 3, 2026. A connected source was read within the last 7 days.
Check if you run it
No confirmed exploitation is on record for CVE-2021-47740. EPSS is 0.42%. Act only if a listed version of KZ Broadband Technologies, Ltd. AM6000N is installed.
Gaps on this record
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- Medium6.9
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.42%
- Remediation
- Advisory link
- Affected products
- vendor KZ Broadband Technologies, Ltd. AM6000N 2.0.0B3042
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.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- vendor KZ Broadband Technologies, Ltd. AM6000N 2.0.0B30422.0.0B3042
How to fix CVE-2021-47740
No stored fix
No vendor fix text is stored. Use the linked advisory before you change production.
Version check
Seen in 2.0.0B3042
Advisory
Open the cve_org record and follow its fix.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2021-47740. EPSS is 0.42%. Act only if a listed version of KZ Broadband Technologies, Ltd. AM6000N is installed.
Which versions are affected?
Compare what you have installed with KZ Broadband Technologies, Ltd. AM6000N 2.0.0B3042 2.0.0B3042. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
No weakness class is stored. EPSS 0.42%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Dec 31, 2025 · EUVD
Detected
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.
Jan 2, 2026 · EUVD
Updated
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.
Sources
- CVE.orgVulnerability recordCVE-2021-47740
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2021-47740
30-day exploitation probability 0.42%
first.org - EUVDVulnerability recordEUVD-2025-206077
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 authenti
euvd.enisa.europa.eu - Packet Storm SecurityCited referencehttps://packetstormsecurity.com/files/161892/
Packet Storm link already published on the finding.
packetstormsecurity.com
References
Freshness
Last verified in this catalog Nov 3, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.
- FIRST EPSSNov 3, 2026
- Packet Storm SecurityNov 3, 2026
- CVE.orgOct 31, 2026
- EUVDOct 31, 2026