CVE-2021-36745Network attack vector

Unauthenticated console access via pre-auth validation failure

Published Sep 29, 2021 · Updated Aug 4, 2024

Authentication bypass in Trend Micro ServerProtect 5.8 and 6.0 allows remote attackers to access its console without credentials. The console fails to validate a crafted request before making its authentication decision, accepting the message without a valid session. Network access to an affected console is sufficient; public sources do not disclose the message format or which console functions become reachable.

CVSS severity9.8
Critical
EPSS probability9.38%
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 Trend Micro ServerProtect 5.8 and 6.0 allows remote attackers to access its console without credentials. The console fails to validate a crafted request before making its authentication decision, accepting the message without a valid session. Network access to an affected console is sufficient; public sources do not disclose the message format or which console functions become reachable.

The record

CVE
CVE-2021-36745
Published
Sep 29, 2021
Updated
Aug 4, 2024
Vendor
Trend Micro
Product
ServerProtect for Storage
Classifications
CWE-425, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 29, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=6.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Trend Micro · ServerProtect for Storageversion=6.0
Trend Micro · ServerProtect for EMC Celerraversion=5.8
Trend Micro · ServerProtect for Network Appliance Filerversion=5.8
Trend Micro · ServerProtect for Microsoft Windows Server and Novell NetWareversion=5.8

Published CVSS scores

9.8Trend MicroCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0NVDAV:N/AC:L/Au:N/C:C/I:C/A:C
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-425Direct Request ('Forced Browsing')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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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