What is CVE-2021-44277?

CVE-2021-44277 is a medium-severity vulnerability in Librenms, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-12-01.

How severe is CVE-2021-44277?

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

XSS in Librenms

CVE-2021-44277

Librenms 21.11.0 is affected by a Cross Site Scripting (XSS) vulnerability in includes/html/common/alert-log.inc.php.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-12-01 · 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: 0.006 (49.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: +0.000

Affected products

Librenms — versions 21.11.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/librenms/librenms/pull/13554 (Exploit, Patch, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2021-44277?: CVE-2021-44277 is a medium-severity vulnerability in Librenms, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-12-01.
How severe is CVE-2021-44277?: Medium severity. CVSS v3 base score is 6.1 out of 10.