HOMEVULNERABILITIESCVE-2021-24223
CRITICAL

CVE-2021-24223

CWE-434Published: April 12, 2021· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

The N5 Upload Form WordPress plugin through 1.0 suffers from an arbitrary file upload issue in page where a Form from the plugin is embed, as any file can be uploaded. The uploaded filename might be hard to guess as it's generated with md5(uniqid(rand())), however, in the case of misconfigured servers with Directory listing enabled, accessing it is trivial.

NVD Source

Technical Analysis

CVE-2021-24223 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 complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

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

Affected Vendors & Products

n5_upload_form_project1 product(s)
n5 upload form
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://github.com/jinhuang1102/CVE-ID-Reports/blob/12863f80ced5361e2e2c3f7209566ab3730aa37b/N5_upload.md
ADVISORYhttps://wpscan.com/vulnerability/d7a72183-0cd1-45de-b98b-2e295b27e5db
ADVISORYhttps://github.com/jinhuang1102/CVE-ID-Reports/blob/12863f80ced5361e2e2c3f7209566ab3730aa37b/N5_upload.md
ADVISORYhttps://wpscan.com/vulnerability/d7a72183-0cd1-45de-b98b-2e295b27e5db

All References (4)

→
https://github.com/jinhuang1102/CVE-ID-Reports/blob/12863f80ced5361e2e2c3f7209566ab3730aa37b/N5_upload.mdExploit · Third Party Advisory
→
https://wpscan.com/vulnerability/d7a72183-0cd1-45de-b98b-2e295b27e5dbExploit · Third Party Advisory
→
https://github.com/jinhuang1102/CVE-ID-Reports/blob/12863f80ced5361e2e2c3f7209566ab3730aa37b/N5_upload.mdExploit · Third Party Advisory
→
https://wpscan.com/vulnerability/d7a72183-0cd1-45de-b98b-2e295b27e5dbExploit · Third Party Advisory

Quick Facts

CVE IDCVE-2021-24223
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-434
CISA KEVNo
Affected1 vendor(s)
PublishedApr 12, 2021

Related CVEs (CWE-434)

CVE-2025-22654
10.0
CVE-2025-47637
10.0
CVE-2019-7257
10.0
CVE-2024-49216
10.0
CVE-2025-39380
10.0
CVE-2025-47642
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-24223 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. CVE data is provided under the NVD usage policy.
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