CVE-2020-7867: An improper input validation vulnerability in Helpu solution could allow a local attacker to arbitrary file cr

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HIGH 8.0DOWNGRADE

CVE-2020-7867 is a high-severity flaw (CVSS 8.0) affecting helpuviewer. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An improper input validation vulnerability in Helpu solution could allow a local attacker to arbitrary file creation and execution without click file transfer menu. It is possible to file in arbitrary directory for user because the viewer program receive the file from agent with privilege of administrator.

Why this priority

High severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.0 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.8% (top 43%)
CISA exploited list	No
Weakness	CWE-20
Published	2021-10-27
Last modified	2026-06-17

Publisher (CNA): KrCERT/CC · Vendor: helpu

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-10-27 01:15 UTCPublished CVE record published
2026-06-17 03:25 UTCUpdated Record last modified

helpu helpuviewer DOWNGRADE

Affected: 2018.5.21.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2018.5.21.0

1. Check installed version

apt-cache policy helpuviewer || rpm -q helpuviewer || helpuviewer --version

2. No fixed release: DOWNGRADE to a release before 2018.5.21.0 (Debian / Ubuntu)

apt-cache madison helpuviewer sudo apt install helpuviewer=<VERSION_BEFORE_2018.5.21.0> sudo apt-mark hold helpuviewer

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list helpuviewer sudo dnf downgrade helpuviewer-<VERSION_BEFORE_2018.5.21.0> sudo dnf versionlock add helpuviewer

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-7867?

helpuviewer: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-7867 being exploited?

CVE-2020-7867 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-7867 affect?

CVE-2020-7867 affects helpuviewer. Severity is high (CVSS 8.0). An improper input validation vulnerability in Helpu solution could allow a local attacker to arbitrary file creation and execution without click file transfer menu. It is possible to file in arbitrary directory for user because the viewer p

How urgent is CVE-2020-7867?

Priority 42/100. High severity

Related CVEs

CVE-2020-7862 HIGH 7.0 DOWNGRADE DOWNGRADE A vulnerability in agent program of HelpU remote control solution could allow an authenticated remote attacker

References

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