CVE-2021-36689

Name: CVE-2021-36689
Creator: NVD / NIST
Published: 2023-03-04T00:15:15.273+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.29%

Last modified Jun 17, 2026

CVE-2021-36689 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. 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.. EPSS estimates a 0.29% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

5.5/10

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

EPSS Probability

0.29%

21.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-521

Affected Software

Vendor	Product	Versions
Samourai-Wallet-Android Project	Samourai-Wallet-Android	0.99.96i

References

https://code.samourai.io/wallet/samourai-wallet-android/-/blob/develop/app/src/main/java/com/samourai/wallet/PinEntryActivity.java#L302Third Party Advisory
https://vrls.ws/posts/2021/08/samourai-wallet-bitcoin-pin-authentication-bypass-crypto/Exploit, Technical Description, Third Party Advisory
https://code.samourai.io/wallet/samourai-wallet-android/-/blob/develop/app/src/main/java/com/samourai/wallet/PinEntryActivity.java#L302Third Party Advisory
https://vrls.ws/posts/2021/08/samourai-wallet-bitcoin-pin-authentication-bypass-crypto/Exploit, Technical Description, Third Party Advisory

Timeline

Published: Mar 4, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-36689?

How severe is CVE-2021-36689?

CVE-2021-36689 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.29% probability of exploitation in the next 30 days.

How do I fix CVE-2021-36689?

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-2021-36689?

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

Scan your code now

Source: NVD / NIST