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CVE-2025-6442

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CVE-2025-6442

Published: Jun 25, 2025

Modified: Jun 25, 2025

PUBLISHED

CVSS v3.0

6.5

MEDIUM

Description

Ruby WEBrick read_header HTTP Request Smuggling Vulnerability. This vulnerability allows remote attackers to smuggle arbitrary HTTP requests on affected installations of Ruby WEBrick. This issue is exploitable when the product is deployed behind an HTTP proxy that fulfills specific conditions. The specific flaw exists within the read_headers method. The issue results from the inconsistent parsing of terminators of HTTP headers. An attacker can leverage this vulnerability to smuggle arbitrary HTTP requests. Was ZDI-CAN-21876.

VendorProductVersions

Ruby

WEBrick

affected
1.8.1

Weaknesses (CWE)

CWE-444

CVSS v3.0 Details

CVSS v3.0 Vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

High

Availability

None

References

ZDI-25-414
x_research-advisory
vendor-provided URL
vendor-advisory

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