CVE-2024-31399Network attack vector

Service interruption via crafted-mail resource exhaustion

Published Jun 11, 2024 · Updated Mar 20, 2025

Resource exhaustion in Cybozu Garoon 5.0.0 through 5.15.2 allows remote attackers to interrupt service through a crafted email. The Mail component continues a resource-consuming loop while processing the message; Cybozu withholds the triggering details and reproduction steps. The attack requires delivery and processing of attacker-supplied mail plus user interaction, and the documented result can make Garoon inaccessible.

CVSS severity4.3
Medium
EPSS probability0.37%
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 Cybozu Garoon 5.0.0 through 5.15.2 allows remote attackers to interrupt service through a crafted email. The Mail component continues a resource-consuming loop while processing the message; Cybozu withholds the triggering details and reproduction steps. The attack requires delivery and processing of attacker-supplied mail plus user interaction, and the documented result can make Garoon inaccessible.

The record

CVE
CVE-2024-31399
Published
Jun 11, 2024
Updated
Mar 20, 2025
Vendor
Cybozu
Product
Garoon
Classifications
CWE-1050, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 11, 2024CVE publishedPublication date reported by the CVE source.
  2. Mar 20, 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=5.0.0 to 5.15.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Cybozu · Garoonversion=5.0.0 to 5.15.2

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.3JPCERT/CCCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
5.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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-1050Excessive Platform Resource Consumption within a Loop
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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