// For flags

CVE-2025-34061

PHPStudy 2016-2018 Backdoor Remote Code Execution Vulnerability

Severity Score

9.3
*CVSS v4

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

1
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Attend
*SSVC
Descriptions

A backdoor in PHPStudy versions 2016 through 2018 allows unauthenticated remote attackers to execute arbitrary PHP code on affected installations. The backdoor listens for base64-encoded PHP payloads in the Accept-Charset HTTP header of incoming requests, decodes and executes the payload without proper validation. This leads to remote code execution as the web server user, compromising the affected system.

Una puerta trasera en las versiones 2016 a 2018 de PHPStudy permite a atacantes remotos no autenticados ejecutar código PHP arbitrario en las instalaciones afectadas. La puerta trasera detecta payloads PHP codificadas en base64 en el encabezado HTTP Accept-Charset de las solicitudes entrantes, las decodifica y las ejecuta sin la validación adecuada. Esto provoca la ejecución remota de código como si fuera el usuario del servidor web, lo que compromete el sistema afectado.

*Credits: Dimensional
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
System
Vulnerable | Subsequent
Confidentiality
High
None
Integrity
High
None
Availability
High
None
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:Attend
Exploitation
None
Automatable
Yes
Tech. Impact
Total
* Organization's Worst-case Scenario
Timeline
  • 2025-04-15 CVE Reserved
  • 2025-07-03 CVE Published
  • 2025-07-07 CVE Updated
  • 2025-07-07 First Exploit
  • 2025-07-09 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-94: Improper Control of Generation of Code ('Code Injection')
CAPEC
  • CAPEC-242: Code Injection
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
---- -