Cyber Resilience

CVE-2021-39434

High

Published: 06 December 2022

Published
06 December 2022
Modified
24 April 2025
KEV Added
Patch
CVSS Score v3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS Score 0.0028 51.7th percentile
Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-39434 is a high-severity Weak Password Requirements (CWE-521) vulnerability in Zkteco Zktime. Its CVSS base score is 7.5 (High).

Operationally, ranked in the top 48.3% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

A default username and password for an administrator account was discovered in ZKTeco ZKTime 10.0 through 11.1.0, builds 20180901, 20190510.1, 20200309.3, 20200930, 20201231, and 20210220.

CWE(s)

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

zkteco
zktime
11.1.0 · 10.0 — 11.1.0

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

addresses: CWE-521

Configuration settings can define and enforce strong password requirements to avoid weak policies.

addresses: CWE-521

IA policy establishes password requirements, directly addressing weak password requirements.

addresses: CWE-521

Ensuring authenticators have sufficient strength of mechanism for intended use addresses weak password requirements.

addresses: CWE-521

Organization-wide password and authentication policies are applied uniformly, preventing weak local password requirements.

addresses: CWE-521

Facilitated training and awareness of current practices improves definition and enforcement of sufficiently strong password requirements.

addresses: CWE-521

Dedicated security resources support deployment of strong authentication systems and enforcement of robust password policies.

addresses: CWE-521

Vulnerability scans assess password policies and weak credential requirements against benchmarks.

addresses: CWE-521

User documentation on maintaining security includes password requirements, directly mitigating weak password policies.

References