What is CVE-2021-40272?

CVE-2021-40272 is a medium-severity vulnerability in Op5 Monitor, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2022-11-14.

How severe is CVE-2021-40272?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2021-40272 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Op5 Monitor

CVE-2021-40272

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

Vulnerability class: XSS (Cross-Site Scripting)

Published 2022-11-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.011 (64.0th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 64.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.011 · change: +0.000

Affected products

Op5 Monitor

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

github.com/hosakauk/exploits/blob/master/itrs_op5_monitor_xss.pdf (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-40272?: CVE-2021-40272 is a medium-severity vulnerability in Op5 Monitor, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2022-11-14.
How severe is CVE-2021-40272?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2021-40272 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.