CVE-2021-40272: OP5 Monitor 8.3.1, 8.3.2, and OP5 8.3.3 are vulnerable to Cross Site Scripting (XSS).

This month

MEDIUM 6.1UPGRADE

CVE-2021-40272 is a medium-severity flaw (CVSS 6.1) affecting monitor. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

OP5 Monitor 8.3.1, 8.3.2, and OP5 8.3.3 are vulnerable to Cross Site Scripting (XSS).

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-79
Published	2022-11-14
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: op5

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

Am I affected?

Timeline

2022-11-14 16:15 UTCPublished CVE record published
2026-06-17 04:06 UTCUpdated Record last modified

op5 monitor UPGRADE

Affected: >= 8.3.0 and <= 8.3.3

Fixed in: newer than 8.3.3

Safe to downgrade to: a release before 8.3.0

1. Check installed version

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

2. UPGRADE to newer than 8.3.3 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade monitor

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 8.3.0 (Debian / Ubuntu)

apt-cache madison monitor sudo apt install monitor=<VERSION_BEFORE_8.3.0> sudo apt-mark hold monitor

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

dnf --showduplicates list monitor sudo dnf downgrade monitor-<VERSION_BEFORE_8.3.0> sudo dnf versionlock add monitor

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Nuclei scan template: IRTS OP5 Monitor - Cross-Site Scripting

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-2021-40272?

monitor: upgrade to newer than 8.3.3. Exact commands for each OS are on this page.

Is CVE-2021-40272 being exploited?

CVE-2021-40272 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-2021-40272 affect?

CVE-2021-40272 affects monitor. Severity is medium (CVSS 6.1). OP5 Monitor 8.3.1, 8.3.2, and OP5 8.3.3 are vulnerable to Cross Site Scripting (XSS).

How urgent is CVE-2021-40272?

Priority 43/100. Public exploit reference

References

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