CVE-2021-44150

Withdrawn file-tampering claim via SHA-1 checksums

Published Nov 22, 2021 · Updated Aug 4, 2024

A disputed checksum-integrity claim in tusdotnet 2.5.0 and earlier alleged that attackers could alter uploaded file content via SHA-1. TusDiskStore advertised only SHA-1 and calculated upload checksums with SHA-1, but GitHub withdrew its advisory after finding no actual security impact. The original report did not establish a practicable collision attack against the upload flow, so no supported confidentiality, integrity, or availability consequence remains.

CVSS severity7.5
High
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A disputed checksum-integrity claim in tusdotnet 2.5.0 and earlier alleged that attackers could alter uploaded file content via SHA-1. TusDiskStore advertised only SHA-1 and calculated upload checksums with SHA-1, but GitHub withdrew its advisory after finding no actual security impact. The original report did not establish a practicable collision attack against the upload flow, so no supported confidentiality, integrity, or availability consequence remains.

The record

CVE
CVE-2021-44150
Published
Nov 22, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-327, CWE-326
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Nov 22, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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 vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

3.1GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
4.3NIST National Vulnerability DatabaseAV:N/AC:M/Au:N/C:N/I:P/A:N
7.5NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-327Use of a Broken or Risky Cryptographic Algorithm
CWE-326Inadequate Encryption Strength

Public exploit references

No public exploit references are available in this record.

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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