CVE-2021-30490: upsMonitor in ViewPower (aka ViewPowerHTML) 1.04-21012 through 1.04-21353 has insecure permissions for the ser

Routine

HIGH 7.8UPGRADE

CVE-2021-30490 is a high-severity flaw (CVSS 7.8) affecting viewpower. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

upsMonitor in ViewPower (aka ViewPowerHTML) 1.04-21012 through 1.04-21353 has insecure permissions for the service binary that enable an Authenticated User to modify files, allowing for privilege escalation.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 78%)
CISA exploited list	No
Weakness	CWE-276
Published	2022-08-16
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: power-software-download

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

Am I affected?

Timeline

2022-08-16 13:15 UTCPublished CVE record published
2026-06-17 03:50 UTCUpdated Record last modified

power-software-download viewpower UPGRADE

Affected: >= 1.04-21012 and <= 1.04-21353

Fixed in: newer than 1.04-21353

Safe to downgrade to: a release before 1.04-21012

1. Check installed version

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

2. UPGRADE to newer than 1.04-21353 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade viewpower

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade viewpower

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 1.04-21012 (Debian / Ubuntu)

apt-cache madison viewpower sudo apt install viewpower=<VERSION_BEFORE_1.04-21012> sudo apt-mark hold viewpower

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list viewpower sudo dnf downgrade viewpower-<VERSION_BEFORE_1.04-21012> sudo dnf versionlock add viewpower

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-2021-30490?

viewpower: upgrade to newer than 1.04-21353. Exact commands for each OS are on this page.

Is CVE-2021-30490 being exploited?

CVE-2021-30490 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-2021-30490 affect?

CVE-2021-30490 affects viewpower. Severity is high (CVSS 7.8). upsMonitor in ViewPower (aka ViewPowerHTML) 1.04-21012 through 1.04-21353 has insecure permissions for the service binary that enable an Authenticated User to modify files, allowing for privilege escalation.

How urgent is CVE-2021-30490?

Priority 38/100. High severity; Public exploit reference

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References

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