CVE-2018-1000821: MicroMathematics version before commit 5c05ac8 contains a XML External Entity (XXE) vulnerability in SMathStud

Q: How do I fix CVE-2018-1000821?

micromathematics: upgrade to 2.17.3. Exact commands for each OS are on this page.

Q: Is CVE-2018-1000821 being exploited?

CVE-2018-1000821 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2018-1000821 affect?

CVE-2018-1000821 affects micromathematics. Severity is critical (CVSS 10.0). 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 expl

Q: How urgent is CVE-2018-1000821?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

This week

CRITICAL 10.0REMOTEUPGRADE

CVE-2018-1000821 is a critical-severity flaw (CVSS 10.0) affecting micromathematics. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	10.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.9% (top 21%)
CISA exploited list	No
Weakness	CWE-611
Published	2018-12-20
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: micromathematics project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-12-20 15:29 UTCPublished CVE record published
2026-06-17 01:33 UTCUpdated Record last modified

micromathematics project micromathematics UPGRADE

Affected: < 2.17.3

Fixed in: 2.17.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy micromathematics || rpm -q micromathematics || micromathematics --version

2. UPGRADE to 2.17.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade micromathematics

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade micromathematics

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2018-1000821?

micromathematics: upgrade to 2.17.3. Exact commands for each OS are on this page.

Is CVE-2018-1000821 being exploited?

CVE-2018-1000821 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2018-1000821 affect?

CVE-2018-1000821 affects micromathematics. Severity is critical (CVSS 10.0). 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 expl

How urgent is CVE-2018-1000821?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

References

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