CVE-2021-28954

Arbitrary code execution via malicious repository

Published Mar 21, 2021 · Updated Aug 3, 2024

Arbitrary code execution in the bit client in Chris Walz bit for Windows before 1.0.5 allows attackers to run code through a crafted repository. On Windows, repository content can hijack the Git executable search path so that a supplied .exe is launched instead of the intended executable. An attacker must induce a user to process the malicious repository; execution then runs with that user's privileges and can compromise confidentiality, integrity, and availability.

CVSS severity7.8
High
EPSS probability0.97%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary code execution in the bit client in Chris Walz bit for Windows before 1.0.5 allows attackers to run code through a crafted repository. On Windows, repository content can hijack the Git executable search path so that a supplied .exe is launched instead of the intended executable. An attacker must induce a user to process the malicious repository; execution then runs with that user's privileges and can compromise confidentiality, integrity, and availability.

The record

CVE
CVE-2021-28954
Published
Mar 21, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-427, T1574.007
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 21, 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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.8NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
7.8NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-427Uncontrolled Search Path Element
T1574.007Path Interception by PATH Environment Variable

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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