Is CVE-2018-1000821 actively exploited?

No active exploitation of CVE-2018-1000821 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2018-1000821 be exploited remotely?

Yes. CVE-2018-1000821 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2018-1000821?

CVE-2018-1000821 has a CVSS score of 10.0 (CRITICAL).

HOME VULNERABILITIESCVE-2018-1000821

CRITICAL

CVE-2018-1000821

CWE-611Published: December 20, 2018· Updated: Jun 17, 2026

10.0

CVSS v3.1

Official Description

MicroMathematics version before commit 5c05ac8 contains a XML External Entity (XXE) vulnerability in SMathStudio files that can result in Disclosure of confidential data, denial of service, SSRF, port scanning. This attack appear to be exploitable via Specially crafted SMathStudio files. This vulnerability appears to have been fixed in after commit 5c05ac8.

NVD Source

Technical Analysis

CVE-2018-1000821 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 10.0.

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.