Is CVE-2016-20030 in the CISA KEV catalog?

No. CVE-2016-20030 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-20030?

CVE-2016-20030 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2016-20030?

CVE-2016-20030 has an EPSS score of 0.56% (43th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2016-20030?

No published fix for CVE-2016-20030 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2016-20030

CRITICAL

9.8

CVSS v3

NVD

Description

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.

CWE-551

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

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CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

0.56%probability of exploitation in 30 days

43rdpercentile

Moderate risk: more likely to be exploited than 43% of all known CVEs.

References

Other references4

Related Vulnerabilities

Other CWE-551 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2021-34429	Medium	5.3	99%	-	Fix
CVE-2021-28164	Medium	5.3	82%	-	Fix
CVE-2021-28165	High	7.5	54%	-	Fix
CVE-2023-23924	Critical	10.0	3.6%	-	-
CVE-2021-32777	High	8.6	3.3%	-	Fix
CVE-2026-44575	High	7.5	1.6%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-08.