What is CVE-2020-28944?

CVE-2020-28944 is a high-severity vulnerability in Open-Xchange Ox Guard, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2021-04-30.

How severe is CVE-2020-28944?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Open-Xchange Ox Guard

CVE-2020-28944

OX Guard 2.10.4 and earlier allows a Denial of Service via a WKS server that responds slowly or with a large amount of data.

Vulnerability class: DoS (Denial of Service)

Published 2021-04-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.016 (74.4th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 74.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Open-Xchange Ox Guard

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

open-xchange.com (Vendor Advisory)
packetstormsecurity.com/files/162406/OX-App-Suite-OX-Guard-SSRF-DoS-Cross-Site-… (VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2020-28944?: CVE-2020-28944 is a high-severity vulnerability in Open-Xchange Ox Guard, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2021-04-30.
How severe is CVE-2020-28944?: High severity. CVSS v3 base score is 7.5 out of 10.