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CVE-2021-4433

24
FAUCET Score

CVE-2021-4433 is a denial-of-service vulnerability affecting Karjasoft Sami HTTP Server 2.0, specifically within an unknown function of its HTTP HEAD Request Handler. With a CVSS score of 7.5 (High), this vulnerability can be exploited remotely without authentication, leading to a complete denial of service for the affected server. While the exploit has been publicly disclosed, there is no evidence of active exploitation, and it has garnered minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
2.0CPE matchmatch criteria
cpe:2.3:a:karjasoft:sami_http_server:2.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.26%
Probability of exploitation in next 30 days
EPSS Percentile
66.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0126 is in the 46th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 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

Remediation records are not available for this CVE.

References

packetstormsecurity.com / files/163138/Sami-HTTP-Server-2.0-Denial-Of-Service.html
ExploitThird Party AdvisoryVDB Entry
vuldb.com
Permissions RequiredThird Party Advisory
vuldb.com
Third Party Advisory