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CVE-2018-1000821

29
FAUCET Score

CVE-2018-1000821 is an XML External Entity (XXE) vulnerability affecting MicroMathematics versions prior to commit 5c05ac8. This flaw allows attackers to disclose confidential data, cause denial of service, perform Server-Side Request Forgery (SSRF), and conduct port scanning through specially crafted SMathStudio files. With a CVSS score of 10.0 (CRITICAL), it presents a severe risk due to its network-based attack vector and low attack complexity, requiring no user interaction. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.17.3CPE matchmatch criteria
cpe:2.3:a:micromathematics_project:micromathematics:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

10.0CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
6.0
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.85%
Probability of exploitation in next 30 days
EPSS Percentile
77.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0186 is in the 65th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

0dd.zone / 2018/10/27/micromathematics-XXE
Third Party Advisory
github.com / mkulesh/microMathematics/issues/79
Issue TrackingThird Party Advisory