Is CVE-2017-18111 actively exploited?

No active exploitation of CVE-2017-18111 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2017-18111 be exploited remotely?

Yes. CVE-2017-18111 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2017-18111?

CVE-2017-18111 has a CVSS score of 8.7 (HIGH).

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HIGH

CVE-2017-18111

CWE-611Published: March 29, 2019· Updated: Jun 17, 2026

8.7

CVSS v3.1

Official Description

The OAuthHelper in Atlassian Application Links before version 5.0.10, from version 5.1.0 before version 5.1.3, and from version 5.2.0 before version 5.2.6 used an XML document builder that was vulnerable to XXE when consuming a client OAuth request. This allowed malicious oauth application linked applications to probe internal network resources by requesting internal locations, read the contents of files and also cause an out of memory exception affecting availability via an XML External Entity vulnerability.

NVD Source

Technical Analysis

CVE-2017-18111 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), availability disruption (denial of service), with a CVSS base score of 8.7.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.