What is CVE-2021-33488?

CVE-2021-33488 is a medium-severity vulnerability in Open-Xchange Ox App Suite, classified under Improper Input Validation. CVSS score: 6.1/10. Published 2021-11-22.

How severe is CVE-2021-33488?

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

Improper input validation in Open-Xchange Ox App Suite

CVE-2021-33488

chat in OX App Suite 7.10.5 has Improper Input Validation. A user can be redirected to a rogue OX Chat server via a development-related hook.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2021-11-22 · 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: 0.012 (65.9th percentile), scored 2026-10-07.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 65.9% 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: 0.012 · change: +0.000

Affected products

Open-Xchange Ox App Suite

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

open-xchange.com (Product)
seclists.org/fulldisclosure/2021/Nov/42 (mailing-list, Exploit, Mailing List, Third Party Advisory)
packetstormsecurity.com/files/165028/OX-App-Suite-Ox-Documents-7.10.x-XSS-Code-… (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-33488?: CVE-2021-33488 is a medium-severity vulnerability in Open-Xchange Ox App Suite, classified under Improper Input Validation. CVSS score: 6.1/10. Published 2021-11-22.
How severe is CVE-2021-33488?: Medium severity. CVSS v3 base score is 6.1 out of 10.