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CVE Record

CVE-2021-26472: Unauthenticated remote command execution with SYSTEM privileges in Vembu products

In VembuBDR before 4.2.0.1 and VembuOffsiteDR before 4.2.0.1 installed on Windows, the http API located at /consumerweb/secure/download.php. Using this command argument an unauthenticated attacker can execute arbitrary OS commands with SYSTEM privileges.

CriticalCVSS 10Not KEV-listedUpdated
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Glexia's TakeAutomated analysiscritical

Security readout for executives and security teams

Plain-English summary

This is a critical flaw in older Windows installations of Vembu backup products. An unauthenticated remote attacker could run operating system commands as SYSTEM, giving them full control of the affected backup server. Backup systems often hold sensitive data and credentials, so exposure should be treated as urgent.

Executive priority

Treat this as a same-day remediation item for any exposed or unpatched Vembu backup server. The impact is full server compromise at SYSTEM level, and backup infrastructure compromise can amplify business recovery risk.

Technical view

CVE-2021-26472 affects VembuBDR and VembuOffsiteDR before 4.2.0.1 on Windows. The bundled CVE description says an HTTP API endpoint accepted a command argument that allowed unauthenticated arbitrary OS command execution with SYSTEM privileges. CVSS is 10.0.

Likely exposure

Organizations running VembuBDR or VembuOffsiteDR on Windows before 4.2.0.1 are the likely exposed population, especially where the web interface or API is reachable from untrusted networks.

Exploitation context

The bundle does not include KEV listing or cited confirmation of active exploitation. Public CSIRT and researcher references document the issue, but exploitation status should be treated as unconfirmed from this evidence.

Researcher notes

The source bundle’s affected CPE fields are generic n/a, but the description names VembuBDR and VembuOffsiteDR before 4.2.0.1 on Windows. Do not broaden scope beyond those products without vendor evidence.

Mitigation direction

  • Inventory VembuBDR and VembuOffsiteDR Windows installations and record exact versions.
  • Upgrade affected systems to 4.2.0.1 or later where applicable.
  • Restrict access to Vembu web and API interfaces to trusted management networks.
  • Review vendor and CSIRT guidance before applying compensating controls.
  • Prioritize backup servers for credential review and incident checks.

Validation and detection

  • Confirm whether any VembuBDR or VembuOffsiteDR Windows host is below 4.2.0.1.
  • Verify the management interface is not internet-accessible.
  • Review security logs for suspicious activity around the Vembu web service.
  • Check backup-server accounts, tokens, and stored credentials for possible exposure.
  • Confirm remediation by validating the installed version after maintenance.
Prepared
Confidence
high
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

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CVE-2021-26472 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Critical
CVSS
10 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
5Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
10CVSS 3.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H3.96Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

10Critical
CVSS 3.1 vector shape for CVE-2021-26472Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.