CVE-2025-23167MediumMicrosoft CVSS 6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C

Microsoft security update for CVE-2025-23167

Published
May 31, 2026
Last Modified
—

🔗 CVE IDs covered (1)

CVE-2025-23167 →

📋 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-2025-23167. This page also shows what EchelonGraph holds for CVE-2025-23167, 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 products13

  • azl3 fluent-bit 3.1.9-4 on Azure Linux 3.0
  • azl3 nodejs 20.14.0-10 on Azure Linux 3.0
  • azl3 nodejs 20.14.0-13 on Azure Linux 3.0
  • azl3 nodejs 20.14.0-14 on Azure Linux 3.0
  • azl3 nodejs 20.14.0-9 on Azure Linux 3.0
  • cbl2 fluent-bit 3.0.6-2 on CBL Mariner 2.0
  • cbl2 nodejs18 18.20.3-10 on CBL Mariner 2.0
  • cbl2 nodejs18 18.20.3-11 on CBL Mariner 2.0
  • cbl2 nodejs18 18.20.3-12
  • cbl2 nodejs18 18.20.3-12 on CBL Mariner 2.0
  • cbl2 nodejs18 18.20.3-12 on CBL-Mariner 2.0
  • cbl2 nodejs18 18.20.3-8 on CBL Mariner 2.0
  • cbl2 nodejs18 18.20.3-9 on CBL Mariner 2.0

✅ Updates Microsoft lists: 1 update

1 row: one per KB article or update, update type and fixed build. Their details are on Microsoft's advisory.

KB articleUpdateFixed build
—Security Update—

🧭 EchelonGraph on CVE-2025-23167

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

A flaw in Node.js 20's HTTP parser allows improper termination of HTTP/1 headers using `\r\n\rX` instead of the required `\r\n\r\n`. This inconsistency enables request smuggling, allowing attackers to bypass proxy-based access controls and submit unauthorized requests. The issue was resolved by upgrading `llhttp` to version 9, which enforces correct header termination. Impact: * This vulnerability affects only Node.js 20.x users prior to the `llhttp` v9 upgrade.

Published by HackerOne, the CVE Numbering Authority that assigned CVE-2025-23167, 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).

🔗 References (2)