CVE-2024-33881Network attack vector

Unauthenticated NTLMv2 hash disclosure via UNC path

Published Jun 24, 2024 · Updated Sep 15, 2024

Information disclosure in VirtoSoftware Virto Bulk File Download 5.5.44 allows remote attackers to obtain an NTLMv2 hash. The isCompleted method in Virto.SharePoint.FileDownloader/Api/Download.ashx accepts a UNC share pathname in the path parameter and causes the SharePoint host to authenticate to an attacker-controlled share. No authentication or user interaction is required; the direct effect is credential-material disclosure, with no reported data modification or service interruption.

CVSS severity7.5
High
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in VirtoSoftware Virto Bulk File Download 5.5.44 allows remote attackers to obtain an NTLMv2 hash. The isCompleted method in Virto.SharePoint.FileDownloader/Api/Download.ashx accepts a UNC share pathname in the path parameter and causes the SharePoint host to authenticate to an attacker-controlled share. No authentication or user interaction is required; the direct effect is credential-material disclosure, with no reported data modification or service interruption.

The record

CVE
CVE-2024-33881
Published
Jun 24, 2024
Updated
Sep 15, 2024
Vendor
VirtoSoftware
Product
Virto Bulk File Download
Classifications
CWE-22, CWE-200, T1187
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 24, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.5.44

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

VirtoSoftware · Virto Bulk File Downloadversion=5.5.44

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1187Forced Authentication

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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