CVE-2024-23304Network attack vector

Service interruption via excessive backend requests

Published Feb 6, 2024 · Updated Jun 4, 2025

Denial of service in Cybozu KUNAI for Android 3.0.20 through 3.0.21 allows remote attackers to interrupt normal app use. Certain mobile-view operations make the client send massive requests to the connected Cybozu product, repeatedly disconnecting sessions. Exploitation requires a KUNAI user to perform the affected operations; the documented consequence is repeated session loss, not data access or modification.

CVSS severity4.7
Medium
EPSS probability0.75%
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 Cybozu KUNAI for Android 3.0.20 through 3.0.21 allows remote attackers to interrupt normal app use. Certain mobile-view operations make the client send massive requests to the connected Cybozu product, repeatedly disconnecting sessions. Exploitation requires a KUNAI user to perform the affected operations; the documented consequence is repeated session loss, not data access or modification.

The record

CVE
CVE-2024-23304
Published
Feb 6, 2024
Updated
Jun 4, 2025
Vendor
Cybozu
Product
Cybozu KUNAI for Android
Classifications
CWE-426, CWE-436, T1498
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 6, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 4, 2025Record 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=3.0.20 to 3.0.21

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Cybozu · Cybozu KUNAI for Androidversion=3.0.20 to 3.0.21

Published CVSS scores

4.3JPCERT/CC and IPAAV:N/AC:M/Au:N/C:N/I:N/A:P
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.7JPCERT/CC and IPACVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:L
7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-426Untrusted Search Path
CWE-436Interpretation Conflict
T1498Network 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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