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Microsoft Security Response CenterCVE-2021-3672

A flaw was found in c-ares library where a missing input validation check of host names returned by DNS (Domain Name Servers) can lead to output of wrong hostnames which might potentially lead to Domain Hijacking. The highest threat from this vulnerability is to confidentiality and integrity as well as system availability.

MediumVendor CVSS 5.6 / 10 1 CVE Published Nov 27, 2021 at 12:00 AM UTC
Get alerts for cm1 pgbouncer 1.16.1-1 on CBL Mariner

Summary

Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?

One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information.

If impact to additional products is identified, we will update the CVE to reflect this.

Products covered

  • cm1 pgbouncer 1.16.1-1 on CBL Mariner 1.0

  • cm1 c-ares 1.18.1-1 on CBL Mariner 1.0

  • cbl2 pgbouncer 1.16.1-1 on CBL Mariner 2.0

  • azl3 ceph 18.2.2-1 on Azure Linux 3.0

  • azl3 ceph 18.2.2-8 on Azure Linux 3.0

Remediation

CBL-Mariner Releases

Vendor-listed fixes

  • 1.16.1-1

  • 1.18.1-1

  • 18.2.2-1

CVEs in this advisory 1

CVE-2021-3672

Updates

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Updated by Microsoft Security Response Center

    The vendor changed the advisory after it was first published.

  3. Added to SecurityAlert

    We collected the advisory from the official source.

  4. Confirmed at the source

    Our collector saw this advisory during a later source check.

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