CVE-2021-36689: An issue discovered in com.samourai.wallet.PinEntryActivity.java in Streetside Samourai Wallet 0.99.96i allows

Routine

MEDIUM 5.5DOWNGRADE

CVE-2021-36689 is a medium-severity flaw (CVSS 5.5) affecting samourai-wallet-android. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue discovered in com.samourai.wallet.PinEntryActivity.java in Streetside Samourai Wallet 0.99.96i allows attackers to view sensitive information and decrypt data via a brute force attack that uses a recovered samourai.dat file. The PIN is 5 to 8 digits, which may be insufficient in this situation.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 77%)
CISA exploited list	No
Weakness	CWE-521
Published	2023-03-04
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: samourai-wallet-android project

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

Am I affected?

Timeline

2023-03-04 00:15 UTCPublished CVE record published
2026-06-17 03:59 UTCUpdated Record last modified

samourai-wallet-android project samourai-wallet-android DOWNGRADE

Affected: 0.99.96i

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.99.96i

1. Check installed version

apt-cache policy samourai-wallet-android || rpm -q samourai-wallet-android || samourai-wallet-android --version

2. No fixed release: DOWNGRADE to a release before 0.99.96i (Debian / Ubuntu)

apt-cache madison samourai-wallet-android sudo apt install samourai-wallet-android=<VERSION_BEFORE_0.99.96i> sudo apt-mark hold samourai-wallet-android

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list samourai-wallet-android sudo dnf downgrade samourai-wallet-android-<VERSION_BEFORE_0.99.96i> sudo dnf versionlock add samourai-wallet-android

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2021-36689?

samourai-wallet-android: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-36689 being exploited?

CVE-2021-36689 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-2021-36689 affect?

CVE-2021-36689 affects samourai-wallet-android. Severity is medium (CVSS 5.5). An issue discovered in com.samourai.wallet.PinEntryActivity.java in Streetside Samourai Wallet 0.99.96i allows attackers to view sensitive information and decrypt data via a brute force attack that uses a recovered samourai.dat file. The PI

How urgent is CVE-2021-36689?

Priority 30/100. Public exploit reference

Software pages

Java vulnerabilities · Android vulnerabilities

References

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