CVE-2023-26595Network attack vector

Service interruption via Message resource exhaustion

Published May 23, 2023 · Updated Jan 28, 2025

Resource exhaustion in Message in Cybozu Garoon 4.10.0 through 5.9.2 allows remote authenticated users to interrupt service. Cybozu identifies resource exhaustion in the Message function but withholds reproduction details, so the resource-consuming input or operation is undisclosed. Authenticated access to Garoon is required, and exploitation can make the application inaccessible without any reported data disclosure or modification.

CVSS severity5.0
Medium
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Message in Cybozu Garoon 4.10.0 through 5.9.2 allows remote authenticated users to interrupt service. Cybozu identifies resource exhaustion in the Message function but withholds reproduction details, so the resource-consuming input or operation is undisclosed. Authenticated access to Garoon is required, and exploitation can make the application inaccessible without any reported data disclosure or modification.

The record

CVE
CVE-2023-26595
Published
May 23, 2023
Updated
Jan 28, 2025
Vendor
Cybozu
Product
Garoon
Classifications
CWE-400, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 23, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 28, 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=4.10.0 to 5.9.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Cybozu · Garoonversion=4.10.0 to 5.9.2

Published CVSS scores

4.0JPCERT/CCAV:N/AC:L/Au:S/C:N/I:N/A:P
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.0JPCERT/CCCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L
5.5CISA-ADPCVSS: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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499Endpoint Denial of Service

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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