CVE-2016-20030 json
ZKTeco ZKBioSecurity 3.0 User Enumeration via authLoginAction
published 2026-03-15 7 mo ago modified 2026-07-28 3 mo ago also EUVD-2016-10815
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 48%
- public exploits
- 0
- none known
Summary
ZKTeco ZKBioSecurity 3.0 contains a user enumeration vulnerability that allows unauthenticated attackers to discover valid usernames by submitting partial characters via the username parameter. Attackers can send requests to the authLoginAction!login.do script with varying username inputs to enumerate valid user accounts based on application responses.
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 7 mo ago
Exploit prediction
0.58% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- packetstormsecurity.com https://packetstormsecurity.com/files/138573 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 9.3 | 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 |
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| CNA | 4.0 | 9.3 | 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/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-551 Incorrect Behavior Order: Authorization Before Parsing and Canonicalization
References
-
packetstormsecurity.com
/files/138573
exploit
-
zeroscience.mk
/en/vulnerabilities/ZSL-2016-5366.php
third-party-advisory
-
exchange.xforce.ibmcloud.com
/vulnerabilities/116485
vdb-entry
-
vulncheck.com
/advisories/zkteco-zkbiosecurity-user-enumeration-via-authloginaction
third-party-advisory
Sources
- CVE List CVE-2016-20030
- NVD CVE-2016-20030
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