CVE-2016-20031 json
ZKTeco ZKBioSecurity 3.0 Local Authorization Bypass via visLogin.jsp
published 2026-03-15 7 mo ago modified 2026-07-28 3 mo ago also EUVD-2016-10817
- cvss
- 5.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 4%
- public exploits
- 0
- none known
Summary
ZKTeco ZKBioSecurity 3.0 contains a local authorization bypass vulnerability in visLogin.jsp that allows attackers to authenticate without valid credentials by spoofing localhost requests. Attackers can exploit the EnvironmentUtil.getClientIp() method which treats IPv6 loopback address 0:0:0:0:0:0:0:1 as 127.0.0.1 and authenticates using the IP as username with hardcoded password 123456 to access sensitive information and perform unauthorized actions.
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 7 mo ago
Exploit prediction
0.15% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- packetstormsecurity.com https://packetstormsecurity.com/files/138571 referenced PoC, tagged "exploit" by a source, unverified
- exploit-db.com https://www.exploit-db.com/exploits/40327/ referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 6.8 | CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N |
| CNA | 3.1 | 5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| CNA | 4.0 | 6.8 | CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/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 |
Affected products
- ZKTeco Inc. ZKTeco ZKBioSecurity
Classification
- Weakness
-
- CWE-798 Use of Hard-coded Credentials
References
-
packetstormsecurity.com
/files/138571
exploit
-
exploit-db.com
/exploits/40327/
exploit
-
zeroscience.mk
/en/vulnerabilities/ZSL-2016-5367.php
third-party-advisory
-
cxsecurity.com
/issue/WLB-2016090003
third-party-advisory
-
exchange.xforce.ibmcloud.com
/vulnerabilities/116488
vdb-entry
-
vulncheck.com
/advisories/zkteco-zkbiosecurity-local-authorization-bypass-via-vislogin-jsp
third-party-advisory
Sources
- CVE List CVE-2016-20031
- NVD CVE-2016-20031
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.