What is CVE-2021-27576?

CVE-2021-27576 is a high-severity vulnerability in Apache Openmeetings. CVSS score: 7.5/10. Published 2021-03-15.

How severe is CVE-2021-27576?

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

Vulnerability in Apache Openmeetings

CVE-2021-27576

If was found that the NetTest web service can be used to overload the bandwidth of a Apache OpenMeetings server. This issue was addressed in Apache OpenMeetings 6.0.0

Published 2021-03-15 · 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: 0.028 (86.6th percentile), scored 2026-10-30.

Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 86.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.028 · newest: 0.028 · change: 0.000

Affected products

Apache Openmeetings
Apache Software Foundation Openmeetings — versions 4.0.0, Apache OpenMeetings 5

References

lists.apache.org/thread.html/r9bb615bd70a0197368f5f3ffc887162686caeb0b5fc30592a… (Mailing List, Vendor Advisory)

Frequently asked questions

What is CVE-2021-27576?: CVE-2021-27576 is a high-severity vulnerability in Apache Openmeetings. CVSS score: 7.5/10. Published 2021-03-15.
How severe is CVE-2021-27576?: High severity. CVSS v3 base score is 7.5 out of 10.