CVE-2016-20030

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.57% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 47.0% of scored records. A rank, not a probability.

NVD base score

9.3 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Deferred. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-03-15 13:35Z7 MO AGO

Last updated

2026-07-28 01:46Z3 MO AGO

Reserved

2026-03-15

Assigning CNA

VulnCheck

Record state

PUBLISHED

Severity

Critical (CVSS 9.3)

CNA CVSS vector

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

Weaknesses

• CWE-551Incorrect Behavior Order: Authorization Before Parsing and CanonicalizationBase

Data version

5.2

Document digest

f6f45a9ded143d7a37c145545a7553e8d1d4bb8c990067995d6fbbe723bef4a6

• www.zeroscience.mkZero Science Lab Disclosurehttps://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5366.phpthird-party-advisory
• exchange.xforce.ibmcloud.comIBM X-Force Exchangehttps://exchange.xforce.ibmcloud.com/vulnerabilities/116485vdb-entry
• packetstormsecurity.comPacket Storm Securityhttps://packetstormsecurity.com/files/138573exploit
• www.vulncheck.comVulnCheck Advisory: ZKTeco ZKBioSecurity 3.0 User Enumeration via authLoginActionhttps://www.vulncheck.com/advisories/zkteco-zkbiosecurity-user-enumeration-via-authloginactionthird-party-advisory