CVE-2021-26824Public exploit

Authentication bypass via replayed success response

Published Jul 26, 2021 · Updated Aug 3, 2024

Authentication bypass in DM FingerTool 1.19 allows local users to access a PD065 Secure USB by replaying a valid response. FingerTool trusts the DeviceIoControl OutBuffer returned by the USB authentication module, so a previously recorded success value can be injected after an incorrect password. The attacker must first capture a successful local authentication result; replay then permits user changes and access to protected USB data.

CVSS severity7.1
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in DM FingerTool 1.19 allows local users to access a PD065 Secure USB by replaying a valid response. FingerTool trusts the DeviceIoControl OutBuffer returned by the USB authentication module, so a previously recorded success value can be injected after an incorrect password. The attacker must first capture a successful local authentication result; replay then permits user changes and access to protected USB data.

The record

CVE
CVE-2021-26824
Published
Jul 26, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-294, T1556
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 26, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record 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

7.8bosslabdcu GitHub Security AdvisoryCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
5.6NIST NVDAV:L/AC:L/Au:N/C:C/I:P/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-294Authentication Bypass by Capture-replay
T1556Modify Authentication Process

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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