CVE-2024-27440Network attack vector

Traffic exposure via improper server certificate verification

Published Mar 13, 2024 · Updated Aug 5, 2024

Improper certificate validation in Toyoko INN App before 1.13.0 for iOS and 1.3.14 for Android allows attackers to read traffic. The server-certificate validation path fails to reject a crafted certificate, allowing a spoofed server to terminate the encrypted connection. Exploitation requires man-in-the-middle attackers to control the network path, such as through a malicious wireless access point, and enables eavesdropping or spoofed data.

CVSS severity4.8
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in Toyoko INN App before 1.13.0 for iOS and 1.3.14 for Android allows attackers to read traffic. The server-certificate validation path fails to reject a crafted certificate, allowing a spoofed server to terminate the encrypted connection. Exploitation requires man-in-the-middle attackers to control the network path, such as through a malicious wireless access point, and enables eavesdropping or spoofed data.

The record

CVE
CVE-2024-27440
Published
Mar 13, 2024
Updated
Aug 5, 2024
Vendor
Toyoko Inn IT Solution Co., Ltd.
Product
Toyoko INN App for iOS
Classifications
CWE-295, T1638
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 13, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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?

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

  1. Affected versionversion=prior to 1.13.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Toyoko Inn IT Solution Co., Ltd. · Toyoko INN App for iOSversion=prior to 1.13.0
Toyoko Inn IT Solution Co., Ltd. · Toyoko INN App for Androidversion=prior 1.3.14

Published CVSS scores

4.8JPCERT/CCCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
4.0JPCERT/CCAV:N/AC:H/Au:N/C:P/I:P/A:N
4.8CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

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-295Improper Certificate Validation
T1638Adversary-in-the-Middle Positioning

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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