CVE-2017-17671

CRITICAL
9.8
CVSS Score
Published: December 14, 2017 at 12:00 AM UTC
Updated: June 17, 2026 at 01:11 AM UTC
1 product affected across 1 vendorvBulletin· also runs on 1 platform

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Severity
CRITICAL9.8
Exploit prediction
EPSS 3%

Description

vBulletin through 5.3.x on Windows allows remote PHP code execution because a require_once call is reachable with an unauthenticated request that can include directory traversal sequences to specify an arbitrary pathname, and because ../ traversal is blocked but ..\ traversal is not blocked. For example, an attacker can make an invalid HTTP request containing PHP code, and then make an index.php?routestring= request with enough instances of ".." to reach an Apache HTTP Server log file.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

5.0.1 ≤ v ≤ 5.3.35.0.0 beta_115.0.0 beta_28
microsoft-windows (environment)

Runs on — not affected

The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

x_refsource_MISCExploitThird Party Advisory
https://blogs.securiteam.com/index.php/archives/3569

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-22

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