CVE-2021-43745Public exploitNetwork attack vector

Service interruption via repeated main-window creation

Published Feb 24, 2022 · Updated Aug 4, 2024

Denial of service in Trilium Notes 0.48.6 allows remote attackers to interrupt the desktop service through its exposed setup route. The setupPage handler invokes windowService.createMainWindow for each request to /setup, so repeated unauthenticated requests create main windows instead of a single setup window and exhaust local resources. The reported Windows installation listens on 0.0.0.0:37840, exposing the route to network peers; public evidence does not distinguish a hang from a crash.

CVSS severity5.5
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Trilium Notes 0.48.6 allows remote attackers to interrupt the desktop service through its exposed setup route. The setupPage handler invokes windowService.createMainWindow for each request to /setup, so repeated unauthenticated requests create main windows instead of a single setup window and exhaust local resources. The reported Windows installation listens on 0.0.0.0:37840, exposing the route to network peers; public evidence does not distinguish a hang from a crash.

The record

CVE
CVE-2021-43745
Published
Feb 24, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 24, 2022CVE 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

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

2.1NVDAV:L/AC:L/Au:N/C:N/I:N/A:P
5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 exploitPublished

Weakness, pattern, technique

T1499.003Application Exhaustion Flood

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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