CVE-2025-6442
5.9 · MEDIUMOverview
CVE-2025-6442 is a medium-severity vulnerability affecting ruby-lang webrick. It was published on June 25, 2025 and has a CVSS 3.1 base score of 5.9 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from ruby-lang. Update webrick to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| ruby-lang | webrick | >= 0, < 1.8.2 | Affected |
Frequently Asked Questions
What is CVE-2025-6442?
CVE-2025-6442 is a medium-severity vulnerability affecting ruby-lang webrick. It was published on June 25, 2025 and has a CVSS 3.1 base score of 5.9 (MEDIUM).
How severe is CVE-2025-6442?
This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2025-6442?
Check the references section for vendor advisories and patches from ruby-lang. Update webrick to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2025-6442?
CyberStrike's AI-powered security agents can automatically detect CVE-2025-6442 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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