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Exchange ServerApplication · Microsoft

CVE-2015-1631

MEDIUM · 5.0 CVSS v2.0 Published 2015-03-11
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
59/100
Remediation priority · Elevated
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Microsoft Exchange Server 2013 SP1 and Cumulative Update 7 allows remote attackers to spoof meeting organizers via unspecified vectors, aka "Exchange Forged Meeting Request Spoofing Vulnerability."

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

This is a spoofing vulnerability in Microsoft Exchange Server 2013 SP1 and Cumulative Update 7 that allows remote attackers to forge meeting requests and impersonate legitimate meeting organizers. Attackers can exploit this to trick users into attending fraudulent meetings or revealing sensitive information through socially engineered meeting invitations.

MitigationApply the appropriate Microsoft security patch for this vulnerability to Exchange Server 2013, or upgrade to a patched cumulative update version. Verify meeting request authentication mechanisms function correctly after patching.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Exchange ServerApplication
Affected:= 2013

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Authentication
None
Confidentiality
None
Integrity
Partial
Availability
None

AV:N/AC:L/Au:N/C:N/I:P/A:N

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify if Exchange Server 2013 is installed
    Open Exchange Management Shell and run: Get-ExchangeServer | Select Name,-AdServer,Domain,Version
    Affected if No Exchange Server 2013 is found in the environment, the system is not affected by this CVE
  2. Determine the Exchange Server 2013 version
    In Exchange Management Shell, run: Get-ExchangeServer | Format-List Name,Edition,AdminDisplayVersion
    Affected if The version displayed shows Exchange Server 2013 SP1 or Cumulative Update 7 (CU7)
  3. Confirm the exact build number
    Run: Get-ExchangeServer | Get-MailboxServer | Select-Object Name,*Version* or check the build number in the Exchange Administration Center under Servers > Servers
    Affected if The build number matches the vulnerable releases for SP1 or CU7 specifically

If Microsoft Exchange Server 2013 SP1 or Cumulative Update 7 is installed, the environment is vulnerable to meeting request spoofing attacks and may be affected by CVE-2015-1631.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply the appropriate Microsoft security patch for this vulnerability to Exchange Server 2013, or upgrade to a patched cumulative update version. Verify meeting request authentication mechanisms function correctly after patching.

Fix this in Exchange Server Scoped from the published advisory
  • Consultation4.0 h
  • Implementation4.0 h
  • Testing4.0 h
  • Review / QA2.0 h
14.0 hours of engineering $2,480
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2015-1631 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data