CVE-2021-4462
published 2025-11-10CVE-2021-4462: Employee Records System version 1.0 contains an unrestricted file upload vulnerability that allows a remote unauthenticated attacker to upload arbitrary files…
PriorityP187critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
ITWEXPLOITVulnCheck KEV
Exploited in the wild
EPSS
3.05%
85.9th percentile
Employee Records System version 1.0 contains an unrestricted file upload vulnerability that allows a remote unauthenticated attacker to upload arbitrary files via the uploadID.php endpoint; uploaded files can be executed because the application does not perform proper server-side validation. Exploitation evidence was observed by the Shadowserver Foundation on 2025-02-06 UTC.
Affected
2 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| employee_records_system | employee_records_system | — | — |
| skittles | employee_records_system | — | — |
Detection & IOCsextracted from sources · hover to see the quote
- →Detect unauthenticated POST requests to /dashboard/uploadID.php with multipart/form-data content type, particularly where the uploaded filename has a .php extension but Content-Type is set to image/png (MIME type mismatch indicating bypass attempt). ↗
- →Monitor for GET requests to /uploads/employees_ids/ for files with .php extensions, which would indicate successful exploitation and attempted execution of an uploaded webshell. ↗
- →The exploit uses the form field name 'employee_ID' to upload a PHP file with a randomized lowercase 5-character basename and .php extension while spoofing Content-Type as image/png. ↗
- →Successful exploitation is confirmed when the response body contains the MD5 hash of the string 'CVE-2021-4462' and the follow-up GET to the uploaded PHP file returns HTTP 200. ↗
- →Active exploitation of this vulnerability was observed in the wild by the Shadowserver Foundation on 2025-02-06 UTC; treat any hits on uploadID.php from unauthenticated sources as high-priority. ↗
- ·The vulnerability is unauthenticated — no session cookie or authentication token is required to reach the uploadID.php endpoint, meaning perimeter authentication controls alone are insufficient. ↗
- ·The application does not perform proper server-side validation of uploaded files, so client-supplied MIME types (e.g., image/png) are trusted; detection must inspect actual file content/extension rather than Content-Type headers. ↗
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvdv4.09.3CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vulncheck9.3CRITICAL
CVEs like this are exactly what “Exploited This Week” covers.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
GHSA
GHSA-cm35-q368-98g3: Employee Records System version 1
ghsa_unreviewed·2025-11-11
CVE-2021-4462 [CRITICAL] CWE-434 GHSA-cm35-q368-98g3: Employee Records System version 1
Employee Records System version 1.0 contains an unrestricted file upload vulnerability that allows a remote unauthenticated attacker to upload arbitrary files via the uploadID.php endpoint; uploaded files can be executed because the application does not perform proper server-side validation.
VulnCheck
skittles employee_records_system Unrestricted Upload of File with Dangerous Type
vulncheck·2021·CVSS 9.3
CVE-2021-4462 [CRITICAL] skittles employee_records_system Unrestricted Upload of File with Dangerous Type
skittles employee_records_system Unrestricted Upload of File with Dangerous Type
Employee Records System version 1.0 contains an unrestricted file upload vulnerability that allows a remote unauthenticated attacker to upload arbitrary files via the uploadID.php endpoint; uploaded files can be executed because the application does not perform proper server-side validation. Exploitation evidence was observed by the Shadowserver Foundation on 2025-02-06 UTC.
Affected: SourceCodester Employee Records System
Required Action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Exploitation References: https://www.cve.org/cverecord?id=CVE-2021-4462; https://www.vulncheck.com/advisories/employees-records-syst
No detection rules found.
Nuclei
Employee Records System 1.0 - Unauthenticated File Upload RCE
nuclei·CVSS 9.3
CVE-2021-4462 [CRITICAL] Employee Records System 1.0 - Unauthenticated File Upload RCE
Employee Records System 1.0 - Unauthenticated File Upload RCE
Employee Records System version 1.0 contains an unrestricted file upload vulnerability in uploadID.php that allows remote unauthenticated attackers to upload arbitrary PHP files and achieve remote code execution.
Template:
id: CVE-2021-4462
info:
name: Employee Records System 1.0 - Unauthenticated File Upload RCE
author: josephttd
severity: critical
description: |
Employee Records System version 1.0 contains an unrestricted file upload vulnerability in uploadID.php that allows remote unauthenticated attackers to upload arbitrary PHP files and achieve remote code execution.
impact: |
Unauthenticated attackers can upload arbitrary PHP files via uploadID.php and achieve remote code execution, leading to complete server compromi
No writeups or analysis indexed.
2025-11-10
Published
Exploited in the wild