CVE-2021-47740

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.43% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 35.7% of scored records. A rank, not a probability.

NVD base score

6.9 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Deferred. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2025-12-31 18:40Z8 MO AGO

Last updated

2026-01-02 20:42Z8 MO AGO

Reserved

2025-12-23

Assigning CNA

VulnCheck

Record state

PUBLISHED

Severity

Medium (CVSS 6.9)

CNA CVSS vector

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

Weaknesses

• CWE-613Insufficient Session ExpirationBase

Data version

5.2

Document digest

c96008fb83b7067661116779dbb6f8f2b21bce6c44fd02bf9beaf880aeb5df2d

• www.zeroscience.mkZero Science Lab Disclosure (ZSL-2021-5646)https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5646.phpthird-party-advisory
• packetstormsecurity.comPacket Storm Security Exploit Entryhttps://packetstormsecurity.com/files/161892/exploit
• exchange.xforce.ibmcloud.comIBM X-Force Vulnerability Exchange Entryhttps://exchange.xforce.ibmcloud.com/vulnerabilities/198471vdb-entry
• www.kzbtech.comKZ TECH Vendor Homepagehttp://www.kzbtech.com/product
• www.jatontech.comJATON TEC Homepagehttps://www.jatontech.com/product
• neotel.mkNeotel Vendor Homepagehttps://neotel.mk/product
• www.vulncheck.comVulnCheck Advisory: KZTech JT3500V 4G LTE CPE 2.0.1 Insufficient Session Expiration Vulnerabilityhttps://www.vulncheck.com/advisories/kztech-jtv-g-lte-cpe-insufficient-session-expiration-vulnerabilitythird-party-advisory