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Unified Communications ManagerApplication · Cisco

CVE-2015-0751

HIGH · 7.8 CVSS v2.0 Published 2015-05-29
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
87/100
Remediation priority · High
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
Cisco IP Phone 7861, when firmware from Cisco Unified Communications Manager 10.3(1) is used, allows remote attackers to cause a denial of service via crafted packets, aka Bug ID CSCus81800.

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

A remote denial of service vulnerability in Cisco IP Phone 7861 when using firmware from Cisco Unified Communications Manager 10.3(1). Attackers can cause the phone to become unresponsive or crash by sending specially crafted packets to the device.

MitigationApply the appropriate Cisco firmware update for the IP Phone 7861 and CUCM version. If patching is not immediately feasible, restrict network access to phones via firewall rules or VLAN segmentation to limit exposure to untrusted networks.

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
Unified Communications ManagerApplication
Affected:= 10.3\(1\)

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
None
Availability
Complete

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

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 the Cisco Unified Communications Manager version
    Log into the CUCM Administration interface and navigate to System > Version Info, or run 'show version' via the CUCM CLI to retrieve the exact firmware version
    Affected if The CUCM version is exactly 10.3(1)
  2. Confirm IP Phone 7861 models are registered
    In CUCM Administration, go to Device > Phone and search for phone model 7861, or run 'show phone' via CLI to list registered devices
    Affected if Any Cisco IP Phone 7861 devices are registered to the CUCM
  3. Verify the phone firmware version
    In CUCM, navigate to Device > Device Settings > Device Default, or check the Phone Firmware Version field in the device configuration page for each 7861 phone
    Affected if The phone firmware originates from CUCM version 10.3(1)

You are affected if Cisco Unified Communications Manager version 10.3(1) is deployed AND Cisco IP Phone 7861 devices are registered to it.

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 Cisco firmware update for the IP Phone 7861 and CUCM version. If patching is not immediately feasible, restrict network access to phones via firewall rules or VLAN segmentation to limit exposure to untrusted networks.

Fix this in Unified Communications Manager Scoped from the published advisory
  • Consultation3.0 h
  • Implementation6.0 h
  • Testing3.0 h
  • Review / QA2.0 h
14.0 hours of engineering $2,490
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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-2015-0751 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