What is CVE-2021-28048?

CVE-2021-28048 is a medium-severity vulnerability in Devolutions Server, classified under Origin Validation Error. CVSS score: 6.5/10. Published 2021-04-14.

How severe is CVE-2021-28048?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Devolutions Server

CVE-2021-28048

An overly permissive CORS policy in Devolutions Server before 2021.1 and Devolutions Server LTS before 2020.3.18 allows a remote attacker to leak cross-origin data via a crafted HTML page.

Published 2021-04-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.006 (44.8th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 44.8% 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

Devolutions Server

Weakness classification (CWE)

CWE-346 — Origin Validation Error

References

devolutions.net/security/advisories/DEVO-2021-0004 (Third Party Advisory)

Frequently asked questions

What is CVE-2021-28048?: CVE-2021-28048 is a medium-severity vulnerability in Devolutions Server, classified under Origin Validation Error. CVSS score: 6.5/10. Published 2021-04-14.
How severe is CVE-2021-28048?: Medium severity. CVSS v3 base score is 6.5 out of 10.