What is CVE-2020-36233?

CVE-2020-36233 is a high-severity vulnerability in Atlassian Bitbucket, classified under Incorrect Default Permissions. CVSS score: 7.8/10. Published 2021-02-18.

How severe is CVE-2020-36233?

High severity. CVSS v3 base score is 7.8 out of 10.

Vulnerability in Atlassian Bitbucket

CVE-2020-36233

The Microsoft Windows Installer for Atlassian Bitbucket Server and Data Center before version 6.10.9, 7.x before 7.6.4, and from version 7.7.0 before 7.10.1 allows local attackers to escalate privileges because of weak permissions on the installation directory.

Published 2021-02-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.003 (17.2th percentile), scored 2026-10-19.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 17th percentile — 17.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Atlassian Bitbucket
Atlassian Bitbucket Data Center — versions unspecified, 7.0.0, 7.7.0
Atlassian Bitbucket Server — versions unspecified, 7.0.0, 7.7.0
Microsoft Windows

Weakness classification (CWE)

CWE-276 — Incorrect Default Permissions

References

jira.atlassian.com/browse/BSERV-12753 (Issue Tracking, Vendor Advisory)
www.kb.cert.org/vuls/id/240785 (US Government Resource, Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2020-36233?: CVE-2020-36233 is a high-severity vulnerability in Atlassian Bitbucket, classified under Incorrect Default Permissions. CVSS score: 7.8/10. Published 2021-02-18.
How severe is CVE-2020-36233?: High severity. CVSS v3 base score is 7.8 out of 10.