What is CVE-2021-3309?

CVE-2021-3309 is a high-severity vulnerability in Wekan Project, classified under Improper Certificate Validation. CVSS score: 8.1/10. Published 2021-01-26.

How severe is CVE-2021-3309?

High severity. CVSS v3 base score is 8.1 out of 10.

Vulnerability in Wekan Project

CVE-2021-3309

packages/wekan-ldap/server/ldap.js in Wekan before 4.87 can process connections even though they are not authorized by the Certification Authority trust store,

Vulnerability class: Improper Certificate Validation

Published 2021-01-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.017 (76.2th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 76.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000

Affected products

Wekan Project

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

github.com/wekan/wekan/issues/3482 (Exploit, Third Party Advisory, Issue Tracking)
github.com/wekan/wekan/pull/3483/commits/31f89121fecca5a761b05cc3a26d4f237e90b4… (Patch, Third Party Advisory)
github.com/wekan/wekan/releases/tag/v4.87 (Third Party Advisory, Release Notes)

Frequently asked questions

What is CVE-2021-3309?: CVE-2021-3309 is a high-severity vulnerability in Wekan Project, classified under Improper Certificate Validation. CVSS score: 8.1/10. Published 2021-01-26.
How severe is CVE-2021-3309?: High severity. CVSS v3 base score is 8.1 out of 10.