What is CVE-2021-28094?

CVE-2021-28094 is a medium-severity vulnerability in Open-Xchange Documents, classified under Inadequate Encryption Strength. CVSS score: 6.5/10. Published 2021-07-30.

How severe is CVE-2021-28094?

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

Vulnerability in Open-Xchange Documents

CVE-2021-28094

OX Documents before 7.10.5-rev7 has Incorrect Access Control for converted documents 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 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.011 (64.7th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 64.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · 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-2021-28094?: CVE-2021-28094 is a medium-severity vulnerability in Open-Xchange Documents, classified under Inadequate Encryption Strength. CVSS score: 6.5/10. Published 2021-07-30.
How severe is CVE-2021-28094?: Medium severity. CVSS v3 base score is 6.5 out of 10.