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CVE-2020-5523: Android App 'MyPallete' and some of the Android banking applications based on 'MyPallete' do not verify X.509

48
This month
HIGH 7.4REMOTEUPGRADEUPGRADEUPGRADE

CVE-2020-5523 is a high-severity flaw (CVSS 7.4) affecting 77 bank, ashigin, dogin. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

  • High severity
  • Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score7.4 (High)
Attack vectorNetwork (remote)
Attack complexityHigh
Privileges neededNone
User interactionNone
EPSS exploit chance1.2% (top 32%)
CISA exploited listNo
WeaknessCWE-295
Published2020-01-28
Last modified2026-06-17
Publisher (CNA): JPCERT/CC · Vendor: 77bank · ashikagabank · hokkaidobank · hokugin · naganobank · nttdata

Share: LinkedIn · X · Reddit

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

77bank 77 bank UPGRADE
Affected: <= 2.0.1
Fixed in: newer than 2.0.1
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy 77-bank || rpm -q 77-bank || 77-bank --version
2. UPGRADE to newer than 2.0.1 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade 77-bank
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade 77-bank
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
ashikagabank ashigin UPGRADE
Affected: <= 1.0.4
Fixed in: newer than 1.0.4
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy ashigin || rpm -q ashigin || ashigin --version
2. UPGRADE to newer than 1.0.4 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade ashigin
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade ashigin
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
hokkaidobank dogin UPGRADE
Affected: <= 3.0.1
Fixed in: newer than 3.0.1
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy dogin || rpm -q dogin || dogin --version
2. UPGRADE to newer than 3.0.1 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade dogin
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade dogin
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
hokugin hokuriku bank portal UPGRADE
Affected: <= 2.0.1
Fixed in: newer than 2.0.1
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy hokuriku-bank-portal || rpm -q hokuriku-bank-portal || hokuriku-bank-portal --version
2. UPGRADE to newer than 2.0.1 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade hokuriku-bank-portal
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade hokuriku-bank-portal
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
naganobank nagagin UPGRADE
Affected: <= 1.0.1
Fixed in: newer than 1.0.1
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy nagagin || rpm -q nagagin || nagagin --version
2. UPGRADE to newer than 1.0.1 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade nagagin
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade nagagin
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
nttdata mypallete MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy mypallete || rpm -q mypallete || mypallete --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-5523?

77 bank: upgrade to newer than 2.0.1; ashigin: upgrade to newer than 1.0.4; dogin: upgrade to newer than 3.0.1. Exact commands for each OS are on this page.

Is CVE-2020-5523 being exploited?

CVE-2020-5523 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-5523 affect?

CVE-2020-5523 affects 77 bank, ashigin, dogin. Severity is high (CVSS 7.4). 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 attac

How urgent is CVE-2020-5523?

Priority 48/100. High severity; Remotely exploitable, no login, no user action

Software pages

Android vulnerabilities

References

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