CVE-2020-5523

Name: CVE-2020-5523
Creator: NVD / NIST
Published: 2020-01-28T06:15:12.353+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.4/10EPSS 1.18%

Last modified Jun 17, 2026

CVE-2020-5523 is a high-severity vulnerability rated 7.4/10 on the CVSS scale. Android App 'MyPallete' and some of the Android banking applications based on 'MyPallete' do not verify X.509 certificates from servers, and also do not properly validate certificates with host-mismatch, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.. EPSS estimates a 1.18% chance of exploitation in the next 30 days.

Description

Android App 'MyPallete' and some of the Android banking applications based on 'MyPallete' do not verify X.509 certificates from servers, and also do not properly validate certificates with host-mismatch, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.

Metrics

CVSS 3.1

7.4/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS Probability

1.18%

63.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-295

Affected Software

Vendor	Product	Versions
77bank	77 Bank	<= 2.0.1
Ashikagabank	Ashigin	<= 1.0.4
Hokkaidobank	Dogin	<= 3.0.1
Hokugin	Hokuriku Bank Portal	<= 2.0.1
Naganobank	Nagagin	<= 1.0.1
Nttdata	Mypallete	All versions
Shikokubank	Shikoku Bank	<= 2.0.1
Sihd-Bk	Ikeda Senshu Bank	<= 3.0.4
Tohoku-Bank	Tougin	<= 1.0.1

References

http://jvn.jp/en/jp/JVN28845872/index.htmlThird Party Advisory
http://www.dokodemobank.ne.jp/info_20200128_bankingapp.htmlThird Party Advisory
https://www.77bank.co.jp/pdf/oshirase/20012801_appvulnerability.pdfThird Party Advisory
https://www.ashikagabank.co.jp/appbanking/pdf/oshirase.pdfThird Party Advisory
https://www.hokkaidobank.co.jp/common/dat/2020/0120/15795047141946146699.pdfThird Party Advisory
https://www.hokugin.co.jp/info/archives/personal/2020/1913.htmlThird Party Advisory
https://www.naganobank.co.jp/soshiki/2/app-ssl.htmlThird Party Advisory
https://www.shikokubank.co.jp/info/apps20200128.htmlThird Party Advisory
https://www.sihd-bk.jp/common_v2/pdf/20200127.pdfThird Party Advisory
https://www.tohoku-bank.co.jp/news/topics/200128_applissl.htmlThird Party Advisory
http://jvn.jp/en/jp/JVN28845872/index.htmlThird Party Advisory
http://www.dokodemobank.ne.jp/info_20200128_bankingapp.htmlThird Party Advisory
https://www.77bank.co.jp/pdf/oshirase/20012801_appvulnerability.pdfThird Party Advisory
https://www.ashikagabank.co.jp/appbanking/pdf/oshirase.pdfThird Party Advisory
https://www.hokkaidobank.co.jp/common/dat/2020/0120/15795047141946146699.pdfThird Party Advisory
https://www.hokugin.co.jp/info/archives/personal/2020/1913.htmlThird Party Advisory
https://www.naganobank.co.jp/soshiki/2/app-ssl.htmlThird Party Advisory
https://www.shikokubank.co.jp/info/apps20200128.htmlThird Party Advisory
https://www.sihd-bk.jp/common_v2/pdf/20200127.pdfThird Party Advisory
https://www.tohoku-bank.co.jp/news/topics/200128_applissl.htmlThird Party Advisory

Timeline

Published: Jan 28, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-5523?

How severe is CVE-2020-5523?

CVE-2020-5523 has a CVSS score of 7.4/10 (HIGH severity). The EPSS model estimates a 1.18% probability of exploitation in the next 30 days.

How do I fix CVE-2020-5523?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-5523?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST