CVE-2017-18087

Severity: high (CVSS 7.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-02-15 · updated 2026-06-17

Description

The download commit resource in Atlassian Bitbucket Server from version 5.1.0 before version 5.1.7, from version 5.2.0 before version 5.2.5, from version 5.3.0 before version 5.3.3 and from version 5.4.0 before version 5.4.1 allows remote attackers to write files to disk potentially allowing them to gain code execution, exploit CVE-2017-1000117 if a vulnerable version of git is in use, and or determine if an internal service exists via an argument injection vulnerability in the at parameter.

Affected products

Atlassian Bitbucket Server: from 5.1.0 before 5.1.7; from 5.2.0 before 5.2.5; from 5.3.0 before 5.3.3; from 5.4.0 (excl.) before 5.4.1 — fixed in 5.1.7, 5.2.5, 5.3.3, 5.4.1

How to fix

Upgrade to a fixed version: Atlassian Bitbucket Server 5.1.7, 5.2.5, 5.3.3, 5.4.1. Check the vendor advisory for mitigations.

References

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