HOMEVULNERABILITIESCVE-2018-0691
MEDIUM

CVE-2018-0691

CWE-295Published: November 15, 2018· Updated: Jun 17, 2026

5.9
CVSS v3.1

Official Description

Multiple +Message Apps (Softbank +Message App for Android prior to version 10.1.7, Softbank +Message App for iOS prior to version 1.1.23, NTT DOCOMO +Message App for Android prior to version 42.40.2800, NTT DOCOMO +Message App for iOS prior to version 1.1.23, KDDI +Message App for Android prior to version 1.0.6, and KDDI +Message App for iOS prior to version 1.1.23) do not verify X.509 certificates from SSL servers, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.

NVD Source

Technical Analysis

CVE-2018-0691 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 5.9.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityHigh
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected Vendors & Products

Apple1 product(s)
iphone os
Google1 product(s)
android
kddi1 product(s)
\+ message
ntt_tocomo1 product(s)
\+ message
ntttocomo1 product(s)
\+ message
softbank1 product(s)
\+ message
Source: NVD CPE · 6 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://www.au.com/information/notice_mobile/service/2018-002/
PATCHhttps://www.nttdocomo.co.jp/info/notice/page/180927_00.html
PATCHhttps://www.softbank.jp/mobile/info/personal/news/service/20180927a/
PATCHhttps://www.au.com/information/notice_mobile/service/2018-002/
PATCHhttps://www.nttdocomo.co.jp/info/notice/page/180927_00.html
PATCHhttps://www.softbank.jp/mobile/info/personal/news/service/20180927a/
ADVISORYhttp://jvn.jp/en/jp/JVN37288228/index.html
ADVISORYhttp://jvn.jp/en/jp/JVN37288228/index.html

All References (8)

→
http://jvn.jp/en/jp/JVN37288228/index.htmlThird Party Advisory
→
https://www.au.com/information/notice_mobile/service/2018-002/Patch · Vendor Advisory
→
https://www.nttdocomo.co.jp/info/notice/page/180927_00.htmlPatch · Vendor Advisory
→
https://www.softbank.jp/mobile/info/personal/news/service/20180927a/Patch · Vendor Advisory
→
http://jvn.jp/en/jp/JVN37288228/index.htmlThird Party Advisory
→
https://www.au.com/information/notice_mobile/service/2018-002/Patch · Vendor Advisory
→
https://www.nttdocomo.co.jp/info/notice/page/180927_00.htmlPatch · Vendor Advisory
→
https://www.softbank.jp/mobile/info/personal/news/service/20180927a/Patch · Vendor Advisory

Quick Facts

CVE IDCVE-2018-0691
CVSS Score5.9 / 10
SeverityMEDIUM
WeaknessCWE-295
CISA KEVNo
Affected6 vendor(s)
PublishedNov 15, 2018

Related CVEs (CWE-295)

CVE-2026-4370
10.0
CVE-2025-68121
10.0
CVE-2018-12829
9.8
CVE-2019-6266
9.8
CVE-2015-7826
9.8
CVE-2018-4991
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2018-0691 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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