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CVE-2021-20104

25
FAUCET Score

CVE-2021-20104 describes an unauthenticated remote code execution vulnerability affecting Machform versions prior to 16. This flaw stems from insufficient sanitization of file attachments uploaded via upload.php, allowing attackers to execute arbitrary code. With a CVSS score of 8.1 (High), the vulnerability is network-exploitable with high impact on confidentiality, integrity, and availability, but requires high attack complexity. While the EPSS score is low, indicating a low probability of exploitation, there is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 16CPE matchmatch criteria
cpe:2.3:a:machform:machform:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.1HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.15%
Probability of exploitation in next 30 days
EPSS Percentile
80.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0215 is in the 37th percentile among its peer group of 8,914 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (5)

asteriskvendor investigatingvia llm_extracted
ciscovendor investigatingvia llm_extracted
miniovendor investigatingvia llm_extracted
opensshvendor investigatingvia llm_extracted
railsvendor investigatingvia llm_extracted

Vendor Advisories (5)

opensshllm-openssh-3f82cfc62e6c5327HIGH

Machform Multiple Vulnerabilities

Jun 28, 2021
railsllm-rails-9281fbbb12f12ac1HIGH

Machform Multiple Vulnerabilities

Jun 28, 2021
miniollm-minio-3c3a21d52a3e29cdHIGH

Machform Multiple Vulnerabilities

Jun 28, 2021
ciscollm-cisco-70192ecd58152671HIGH

Machform Multiple Vulnerabilities

Jun 28, 2021
asteriskllm-asterisk-061bd539be48afe2HIGH

Machform Multiple Vulnerabilities

Jun 28, 2021

References

tenable.com / security/research/tra-2021-25%2Chttps://www.machform.com/blog-machform-16-released