CVE-2021-26472Known exploitationPublic exploitNetwork attack vector

Unauthenticated SYSTEM command execution via accountID injection

Published Jun 8, 2021 · Updated Sep 16, 2024

OS command injection in VembuBDR and VembuOffsiteDR before 4.2.0.1 allows remote attackers to execute commands as SYSTEM. The download.php API passes the attacker-controlled accountID command argument to Windows command processing without neutralizing command separators. The endpoint requires no authentication, and successful exploitation grants full control of the affected Windows host.

CVSS severity9.8
Critical
EPSS probability2.46%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in VembuBDR and VembuOffsiteDR before 4.2.0.1 allows remote attackers to execute commands as SYSTEM. The download.php API passes the attacker-controlled accountID command argument to Windows command processing without neutralizing command separators. The endpoint requires no authentication, and successful exploitation grants full control of the affected Windows host.

The record

CVE
CVE-2021-26472
Published
Jun 8, 2021
Updated
Sep 16, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-78, T1190, T1059.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 8, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0MITRECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
10.0NIST NVDAV:N/AC:L/Au:N/C:C/I:C/A:C

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1190Exploit Public-Facing Application
T1059.003Windows Command Shell

Public exploit references

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

Reported exploitation

Technologies

Your stack

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Your stack

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