What is CVE-2021-33900?

CVE-2021-33900 is a high-severity vulnerability in Apache Directory Studio, classified under Missing Encryption of Sensitive Data. CVSS score: 7.5/10. Published 2021-07-26.

How severe is CVE-2021-33900?

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

Vulnerability in Apache Directory Studio

CVE-2021-33900

While investigating DIRSTUDIO-1219 it was noticed that configured StartTLS encryption was not applied when any SASL authentication mechanism (DIGEST-MD5, GSSAPI) was used. While investigating DIRSTUDIO-1220 it was noticed that any configured SASL confidentiality layer was not applied. This issue affects Apache Directory Studio version 2.0.0.v20210213-M16 and prior versions.

Published 2021-07-26 · 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:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.008 (54.7th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 54.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Apache Directory Studio — versions 2.0.0
Apache Software Foundation Directory Studio — versions unspecified

Weakness classification (CWE)

References

lists.apache.org/thread.html/rb1dbcc43a5b406e45d335343a1704f4233de613140a01929d… (Mailing List, Vendor Advisory)

Frequently asked questions

What is CVE-2021-33900?: CVE-2021-33900 is a high-severity vulnerability in Apache Directory Studio, classified under Missing Encryption of Sensitive Data. CVSS score: 7.5/10. Published 2021-07-26.
How severe is CVE-2021-33900?: High severity. CVSS v3 base score is 7.5 out of 10.