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CVE-2021-20101

21
FAUCET Score

CVE-2021-20101 describes an HTTP host header injection vulnerability in Machform versions prior to 16, where improperly validated host headers can lead to victims receiving malformed content. This medium-severity vulnerability (CVSS 6.1) has a network attack vector and low attack complexity, requiring user interaction, and could result in limited confidentiality and integrity impacts. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage 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

6.1MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.72%
Probability of exploitation in next 30 days
EPSS Percentile
50.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0072 is in the 56th percentile among its peer group of 26,234 CVEs.

Social Chatter

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