CVE-2021-36689Public exploit

Wallet decryption via offline PIN brute force

Published Mar 3, 2023 · Updated Mar 7, 2025

Weak PIN protection in Streetside Samourai Wallet 0.99.96i allows local users to decrypt wallet data from a recovered samourai.dat file. PinEntryActivity derives the AES-256-CBC key from a plaintext device GUID plus a 5-to-8-digit PIN using only 15,000 PBKDF2-HMAC-SHA256 iterations, enabling offline enumeration. Access requires the app's private data file and stored GUID; successful cracking exposes the wallet passphrase and permits control of its funds.

CVSS severity5.5
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Weak PIN protection in Streetside Samourai Wallet 0.99.96i allows local users to decrypt wallet data from a recovered samourai.dat file. PinEntryActivity derives the AES-256-CBC key from a plaintext device GUID plus a 5-to-8-digit PIN using only 15,000 PBKDF2-HMAC-SHA256 iterations, enabling offline enumeration. Access requires the app's private data file and stored GUID; successful cracking exposes the wallet passphrase and permits control of its funds.

The record

CVE
CVE-2021-36689
Published
Mar 3, 2023
Updated
Mar 7, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-521, T1110.002
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 3, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 7, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.6NIST NVDAV:L/AC:L/Au:S/C:C/I:N/A:N
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-521Weak Password Requirements
T1110.002Brute Force: Password Cracking

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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