HOMEVULNERABILITIESCVE-2021-4433
HIGH

CVE-2021-4433

CWE-404Published: January 18, 2024· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

A vulnerability was found in Karjasoft Sami HTTP Server 2.0. It has been classified as problematic. Affected is an unknown function of the component HTTP HEAD Rrequest Handler. The manipulation leads to denial of service. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. The identifier of this vulnerability is VDB-250836.

NVD Source

Technical Analysis

CVE-2021-4433 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

karjasoft1 product(s)
sami http server
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://packetstormsecurity.com/files/163138/Sami-HTTP-Server-2.0-Denial-Of-Service.html
ADVISORYhttps://vuldb.com/?ctiid.250836
ADVISORYhttps://vuldb.com/?id.250836
ADVISORYhttps://packetstormsecurity.com/files/163138/Sami-HTTP-Server-2.0-Denial-Of-Service.html
ADVISORYhttps://vuldb.com/?ctiid.250836
ADVISORYhttps://vuldb.com/?id.250836

All References (6)

→
https://packetstormsecurity.com/files/163138/Sami-HTTP-Server-2.0-Denial-Of-Service.htmlExploit · Third Party Advisory · VDB Entry
→
https://vuldb.com/?ctiid.250836Permissions Required · Third Party Advisory
→
https://vuldb.com/?id.250836Third Party Advisory
→
https://packetstormsecurity.com/files/163138/Sami-HTTP-Server-2.0-Denial-Of-Service.htmlExploit · Third Party Advisory · VDB Entry
→
https://vuldb.com/?ctiid.250836Permissions Required · Third Party Advisory
→
https://vuldb.com/?id.250836Third Party Advisory

Quick Facts

CVE IDCVE-2021-4433
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-404
CISA KEVNo
Affected1 vendor(s)
PublishedJan 18, 2024

Related CVEs (CWE-404)

CVE-2025-5867
9.8
CVE-2023-24444
9.8
CVE-2018-8450
8.8
CVE-2026-1876
8.7
CVE-2026-1875
8.7
CVE-2026-11317
8.7

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-4433 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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