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Highest advisory severityCritical Exploited CISA KEV 1 vendor · 1 advisory

CVE-2021-26855

CVE-2021-26855: 1 tracked advisory record across MS Server. CISA KEV listed; exploitation observed. Compare vendor sources and published fix guidance.

Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.

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Vendor advisory comparison

MS Server

1 advisory
  • Advisory severityCritical9.1

    Critical [CVE-2021-26855] Microsoft Exchange Server Remote Code Execution Vulnerability

    CVE-2021-26855Source published Source updated

    Microsoft Exchange Server Remote Code Execution Vulnerability Affected products named by the advisory: Microsoft Exchange Server 2016 Cumulative Update 19; Microsoft Exchange Server 2019 Cumulative Update 8; Microsoft Exchange Server 2019; Microsoft Exchange Server 2013 Cumulative Update 22; and 20 more. Affected products named by the advisory: Microsoft Exchange Server 2019 Cumulative Update 2; Microsoft Exchange Server 2016 Cumulative Update 13; Microsoft Exchange Server 2013 Cumulative Update 23; Microsoft Exchange Server 2019 Cumulative Update 3; and 16 more.

    Affected products in this advisory
    • Microsoft Exchange Server 2016 Cumulative Update 19
    • Microsoft Exchange Server 2019 Cumulative Update 8
    • Microsoft Exchange Server 2013 Cumulative Update 22
    • Microsoft Exchange Server 2019 Cumulative Update 2

    19 more entries in the full advisory.

    Source-reported affected versions
    • Microsoft Exchange Server 2016 Cumulative Update 19 15.01.0 before publication
    • Microsoft Exchange Server 2019 Cumulative Update 8 15.02.0 before publication
    • Microsoft Exchange Server 2019 15.02.0 before publication
    • Microsoft Exchange Server 2013 Cumulative Update 22 15.00.0 before publication

    8 more entries in the full advisory.

    Source-reported fixed versions
    • publication
    Mitigation guidance
    No mitigation guidance extracted; consult the source.
    Full advisory and evidenceOpen source bulletin

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