What is CVE-2021-28095?

CVE-2021-28095 is a medium-severity vulnerability in Open-Xchange Documents, classified under Inadequate Encryption Strength. CVSS score: 4.8/10. Published 2021-07-30.

How severe is CVE-2021-28095?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Vulnerability in Open-Xchange Documents

CVE-2021-28095

OX Documents before 7.10.5-rev5 has Incorrect Access Control for documents that contain XML structures because hash collisions can occur, due to use of CRC32.

Published 2021-07-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.009 (58.2th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 58.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Open-Xchange Documents — versions 7.10.5

Weakness classification (CWE)

CWE-326 — Inadequate Encryption Strength

References

www.open-xchange.com (Product)
seclists.org/fulldisclosure/2021/Jul/37 (mailing-list, Mailing List, Third Party Advisory)
packetstormsecurity.com/files/163569/OX-Documents-7.10.5-Improper-Authorization… (VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2021-28095?: CVE-2021-28095 is a medium-severity vulnerability in Open-Xchange Documents, classified under Inadequate Encryption Strength. CVSS score: 4.8/10. Published 2021-07-30.
How severe is CVE-2021-28095?: Medium severity. CVSS v3 base score is 4.8 out of 10.