# CVE-2016-20024

## Summary

- **CVE ID:** CVE-2016-20024
- **Severity:** CRITICAL
- **CVSS Score:** 9.8 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-538
- **Published:** Mar 15, 2026
- **Last Modified:** Jul 28, 2026

## Description

ZKTeco ZKTime.Net 3.0.1.6 contains an insecure file permissions vulnerability that allows unprivileged users to escalate privileges by modifying executable files. Attackers can exploit world-writable permissions on the ZKTimeNet3.0 directory and its contents to replace executable files with malicious binaries for privilege escalation.

## Affected Products

- ZKTeco Inc. — ZKTeco ZKTime.Net (3.0.1.6)
- ZKTeco Inc. — ZKTeco ZKTime.Net (3.0.1.5 (160622))
- ZKTeco Inc. — ZKTeco ZKTime.Net (3.0.1.1 (160216))

## References

- [CNA](https://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5360.php)
- [CNA](https://cxsecurity.com/issue/WLB-2016080264)
- [CNA](https://exchange.xforce.ibmcloud.com/vulnerabilities/116487)
- [CNA](https://packetstormsecurity.com/files/138565)
- [CNA](https://www.exploit-db.com/exploits/40322/)
- [CNA](https://www.vulncheck.com/advisories/zkteco-zktime-net-insecure-file-permissions-privilege-escalation)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.73%
- **EPSS Percentile:** 52.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._