CVE-2020-36894Public exploitNetwork attack vector

Unauthenticated administrator creation via crafted AMF objects

Published Dec 10, 2025 · Updated Dec 10, 2025

Authentication bypass in EIBIZ iMedia Server Digital Signage through 3.8.0 allows remote attackers to create administrative users. Crafted AMF-encoded serialized objects sent to /messagebroker/amf trigger administrative user creation without caller authentication. Network access to /messagebroker/amf is the sole documented prerequisite; successful exploitation adds an administrative account, and no post-login capabilities are documented.

CVSS severity9.3
Critical
EPSS probability0.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in EIBIZ iMedia Server Digital Signage through 3.8.0 allows remote attackers to create administrative users. Crafted AMF-encoded serialized objects sent to /messagebroker/amf trigger administrative user creation without caller authentication. Network access to /messagebroker/amf is the sole documented prerequisite; successful exploitation adds an administrative account, and no post-login capabilities are documented.

The record

CVE
CVE-2020-36894
Published
Dec 10, 2025
Updated
Dec 10, 2025
Vendor
EIBIZ Co.,Ltd.
Product
i-Media Server Digital Signage
Classifications
CWE-306, T1136, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 10, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 10, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=3.8.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

EIBIZ Co.,Ltd. · i-Media Server Digital Signageversion=0 <=3.8.0

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1136Create Account
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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