CVE-2020-7867Network attack vector

Arbitrary file execution via privileged file receipt

Published Oct 27, 2021 · Updated Aug 4, 2024

Improper input validation in HelpU Viewer 2018.5.21.0 and earlier allows remote authenticated users to create and execute arbitrary files. The viewer accepts a file pushed by the agent outside the file-transfer menu, fails to constrain its destination directory, and handles it with administrator privileges. Exploitation requires an authenticated agent interaction and user participation in the session, after which attacker-supplied code executes with the viewer's elevated rights.

CVSS severity8.0
High
EPSS probability0.81%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in HelpU Viewer 2018.5.21.0 and earlier allows remote authenticated users to create and execute arbitrary files. The viewer accepts a file pushed by the agent outside the file-transfer menu, fails to constrain its destination directory, and handles it with administrator privileges. Exploitation requires an authenticated agent interaction and user participation in the session, after which attacker-supplied code executes with the viewer's elevated rights.

The record

CVE
CVE-2020-7867
Published
Oct 27, 2021
Updated
Aug 4, 2024
Vendor
HelpU
Product
HelpU Viewer
Classifications
CWE-20, T1105
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 27, 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?

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

  1. Affected versionversion=2018.5.21.0 <=2018.5.21.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

HelpU · HelpU Viewerversion=2018.5.21.0 <=2018.5.21.0

Published CVSS scores

4.6NVDAV:L/AC:L/Au:N/C:P/I:P/A:P
8.0KrCERT/CCCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1105Ingress Tool Transfer

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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