HOMEVULNERABILITIESCVE-2021-42671
HIGH

CVE-2021-42671

CWE-425Published: November 5, 2021· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

An incorrect access control vulnerability exists in Sourcecodester Engineers Online Portal in PHP in nia_munoz_monitoring_system/admin/uploads. An attacker can leverage this vulnerability in order to bypass access controls and access all the files uploaded to the web server without the need of authentication or authorization.

NVD Source

Technical Analysis

CVE-2021-42671 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), 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
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected Vendors & Products

engineers_online_portal_project1 product(s)
engineers online portal
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/TheHackingRabbi/CVE-2021-42671
ADVISORYhttps://github.com/nu11secur1ty/CVE-mitre/tree/main/CVE-2021-42671
ADVISORYhttps://www.sourcecodester.com/php/13115/engineers-online-portal-php.html
ADVISORYhttps://github.com/TheHackingRabbi/CVE-2021-42671
ADVISORYhttps://github.com/nu11secur1ty/CVE-mitre/tree/main/CVE-2021-42671
ADVISORYhttps://www.sourcecodester.com/php/13115/engineers-online-portal-php.html

All References (6)

→
https://github.com/TheHackingRabbi/CVE-2021-42671Exploit · Third Party Advisory
→
https://github.com/nu11secur1ty/CVE-mitre/tree/main/CVE-2021-42671Exploit · Third Party Advisory
→
https://www.sourcecodester.com/php/13115/engineers-online-portal-php.htmlProduct · Third Party Advisory
→
https://github.com/TheHackingRabbi/CVE-2021-42671Exploit · Third Party Advisory
→
https://github.com/nu11secur1ty/CVE-mitre/tree/main/CVE-2021-42671Exploit · Third Party Advisory
→
https://www.sourcecodester.com/php/13115/engineers-online-portal-php.htmlProduct · Third Party Advisory

Quick Facts

CVE IDCVE-2021-42671
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-425
CISA KEVNo
Affected1 vendor(s)
PublishedNov 5, 2021

Related CVEs (CWE-425)

CVE-2018-3774
10.0
CVE-2019-9552
9.8
CVE-2017-17736
9.8
CVE-2024-42001
9.8
CVE-2024-24592
9.8
CVE-2020-24203
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-42671 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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