What is CVE-2022-43543?

CVE-2022-43543 is a medium-severity vulnerability in Docomo \+ Message, classified under Improper Encoding or Escaping of Output. CVSS score: 5.4/10. Published 2022-12-21.

How severe is CVE-2022-43543?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Vulnerability in Docomo \+ Message

CVE-2022-43543

KDDI +Message App, NTT DOCOMO +Message App, and SoftBank +Message App contain a vulnerability caused by improper handling of Unicode control characters. +Message App displays text unprocessed, even when control characters are contained, and the text is shown based on Unicode control character's specifications. Therefore, a crafted text may display misleading web links. As a result, a spoofed URL may be displayed and phishing attacks may be conducted. Affected products and versions are as follows: KDDI +Message App for Android prior to version 3.9.2 and +Message App for iOS prior to version 3.9.4, NTT DOCOMO +Message App for Android prior to version 54.49.0500 and +Message App for iOS prior to version 3.9.4, and SoftBank +Message App for Android prior to version 12.9.5 and +Message App for iOS prior to version 3.9.4

Published 2022-12-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.005 (39.6th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 39.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Docomo \+ Message
Kddi \+ Message
Kddi Corporation, Ntt Docomo, Inc., And Softbank Corp. +message App For Android iOS, Docomo iOS — versions KDDI +Message App for Android prior to version 3.9.2 and +Message App for iOS prior to version 3.9.4, NTT DOCOMO +Message App for Android prior to version 54.49.0500 and +Message App for iOS prior to version 3.9.4, and SoftBank +Message App for Android prior to version 12.9.5 and +Message App for iOS prior to version 3.9.4
Softbank \+ Message

Weakness classification (CWE)

CWE-116 — Improper Encoding or Escaping of Output

References

www.au.com/mobile/service/plus-message/information/ (Vendor Advisory)
www.docomo.ne.jp/service/plus_message/ (Vendor Advisory)
www.softbank.jp/mobile/service/plus-message/ (Vendor Advisory)
jvn.jp/en/jp/JVN43561812/index.html (Third Party Advisory)

Frequently asked questions

What is CVE-2022-43543?: CVE-2022-43543 is a medium-severity vulnerability in Docomo \+ Message, classified under Improper Encoding or Escaping of Output. CVSS score: 5.4/10. Published 2022-12-21.
How severe is CVE-2022-43543?: Medium severity. CVSS v3 base score is 5.4 out of 10.