CVE-2025-14523HighMicrosoft CVSS 8.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N/E:P

Microsoft advisory for CVE-2025-14523

Published
December 13, 2025
Last Modified
—

🔗 CVE IDs covered (1)

CVE-2025-14523 →

📋 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-2025-14523. This page also shows what EchelonGraph holds for CVE-2025-14523, 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

  • azl3 libsoup 3.4.4-10 on Azure Linux 3.0
  • azl3 libsoup 3.4.4-11 on Azure Linux 3.0
  • azl3 libsoup 3.4.4-12 on Azure Linux 3.0
  • azl3 libsoup 3.4.4-14 on Azure Linux 3.0
  • azl3 libsoup 3.4.4-15 on Azure Linux 3.0
  • cbl2 libsoup 3.0.4-10 on CBL Mariner 2.0
  • cbl2 libsoup 3.0.4-12 on CBL Mariner 2.0
  • cbl2 libsoup 3.0.4-13 on CBL Mariner 2.0

🧭 EchelonGraph on CVE-2025-14523

EchelonGraph score
8.2 HIGH
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 libsoup’s HTTP header handling allows multiple Host: headers in a request and returns the last occurrence for server-side processing. Common front proxies often honor the first Host: header, so this mismatch can cause vhost confusion where a proxy routes a request to one backend but the backend interprets it as destined for another host. This discrepancy enables request-smuggling style attacks, cache poisoning, or bypassing host-based access controls when an attacker supplies duplicate Host headers.

Published by Red Hat, Inc., the CVE Numbering Authority that assigned CVE-2025-14523, 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 (1)