Microsoft security update for CVE-2025-6442
🔗 CVE IDs covered (1)
📋 Microsoft's advisory
EchelonGraph does not copy Microsoft's advisory page: its FAQ and remediation text are not shown here. Read the advisory on https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-6442. This page also shows what EchelonGraph holds for CVE-2025-6442, with the description from its CVE record, which the CVE Numbering Authority that assigned the CVE wrote: for a CVE Microsoft assigned, often in the words of Microsoft's own advisory.
🎯 Affected products8
- Azure Linux 3.0 ARM
- Azure Linux 3.0 x64
- CBL Mariner 2.0 ARM
- CBL Mariner 2.0 x64
- azl3 ruby 3.3.5-4 on Azure Linux 3.0
- azl3 rubygem-webrick 1.8.1-2 on Azure Linux 3.0
- cbl2 ruby 3.1.7-1 on CBL Mariner 2.0
- cbl2 rubygem-webrick 1.7.0-2 on CBL Mariner 2.0
✅ Updates Microsoft lists: 8 updates
8 rows: one per KB article or update, update type and fixed build. Their details are on Microsoft's advisory.
| KB article | Update | Fixed build |
|---|---|---|
| — | Security Update | 1.8.1-2 |
| — | Security Update | 3.1.7-2 |
| — | Security Update | 1.7.0-2 |
| — | CBL-Mariner | 3.1.7-2 |
| — | CBL-Mariner | 1.7.0-2 |
| — | CBL-Mariner | 3.3.5-4 |
| — | CBL-Mariner | 1.8.1-2 |
| — | Security Update | 3.3.5-4 |
🧭 EchelonGraph on CVE-2025-6442
- EchelonGraph score
- 6.5 MEDIUM
- CISA KEV
- Not listed
- Fix status
- A fix is available — apply it.
Description from the CVE record (CVE.org), as published by its numbering authority
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.
Published by Zero Day Initiative, the CVE Numbering Authority that assigned CVE-2025-6442, in its CVE record at CVE.org; reused under the CVE Program's Terms of Use (its licence and MITRE's copyright notice are in our Terms of Service).