What is CVE-2021-44201?

CVE-2021-44201 is a medium-severity vulnerability in Acronis Cyber Protect 15, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-11-29.

How severe is CVE-2021-44201?

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

XSS in Acronis Cyber Protect 15

CVE-2021-44201

Cross-site scripting (XSS) was possible in notification pop-ups. The following products are affected: Acronis Cyber Protect 15 (Windows, Linux) before build 28035

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-11-29 · 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 (45.6th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 45.6% 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

Acronis Cyber Protect 15 — versions unspecified
Acronis Cyber Protect — versions 15
Linux Kernel
Microsoft Windows

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisory.acronis.com/advisories/SEC-3167 (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2021-44201?: CVE-2021-44201 is a medium-severity vulnerability in Acronis Cyber Protect 15, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-11-29.
How severe is CVE-2021-44201?: Medium severity. CVSS v3 base score is 6.1 out of 10.