Insecure File Permissions Vulnerability in ZKTeco ZKTime.Net by ZKTeco
CVE-2016-20024

9.3CRITICAL

Key Information:

Vendor

Zkteco Inc.

Status
Zkteco Zktime.net
Vendor
CVE Published:
15 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2016-20024?

ZKTeco ZKTime.Net version 3.0.1.6 suffers from an insecure file permissions vulnerability that enables unprivileged users to escalate their privileges. This security flaw arises from world-writable permissions on the ZKTime.Net 3.0 directory, allowing malicious alteration of executable files. Attackers can exploit this oversight to replace legitimate executables with their own harmful binaries, facilitating unauthorized access and control.

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Affected Version(s)

ZKTeco ZKTime.Net 3.0.1.6

ZKTeco ZKTime.Net 3.0.1.5 (160622)

ZKTeco ZKTime.Net 3.0.1.1 (160216)

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2016-20024 - Proof of Concept

CVE-2016-20024 - Proof of Concept

References

https://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-53...
third-party-advisory
https://cxsecurity.com/issue/WLB-2016080264
third-party-advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/116487
vdb-entry

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

LiquidWorm as Gjoko Krstic of Zero Science Lab
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