CVE-2020-36233

Local privilege escalation via weak installation-directory ACLs

Published Feb 18, 2021 · Updated Sep 16, 2024

Privilege escalation in Bitbucket Server and Data Center before 6.10.9, 7.x before 7.6.4, and 7.7.0 through 7.10.0 grants local users elevation. The Microsoft Windows installer assigns weak ACLs to the installation directory even though Bitbucket runs high-privileged services from that tree. This Windows-only condition exposes service-used files to modification by a low-privileged account, enabling execution with the service's privileges.

CVSS severity7.8
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Privilege escalation in Bitbucket Server and Data Center before 6.10.9, 7.x before 7.6.4, and 7.7.0 through 7.10.0 grants local users elevation. The Microsoft Windows installer assigns weak ACLs to the installation directory even though Bitbucket runs high-privileged services from that tree. This Windows-only condition exposes service-used files to modification by a low-privileged account, enabling execution with the service's privileges.

The record

CVE
CVE-2020-36233
Published
Feb 18, 2021
Updated
Sep 16, 2024
Vendor
Atlassian
Product
Bitbucket Server
Classifications
CWE-276, T1574.010
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 18, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.0.0 <unspecified
  2. Affected versionversion=7.7.0 <unspecified
  3. Affected versionversion=unspecified <6.10.9
  4. Affected versionversion=unspecified <7.10.1
  5. Affected versionversion=unspecified <7.6.4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Atlassian · Bitbucket Serverversion=7.0.0 <unspecified; version=7.7.0 <unspecified; version=unspecified <6.10.9; version=unspecified <7.10.1; version=unspecified <7.6.4
Atlassian · Bitbucket Data Centerversion=7.0.0 <unspecified; version=7.7.0 <unspecified; version=unspecified <6.10.9; version=unspecified <7.10.1; version=unspecified <7.6.4

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.6NIST NVDAV:L/AC:L/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-276Incorrect Default Permissions
T1574.010Services File Permissions Weakness

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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