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Unified Communications ManagerApplication · Cisco

CVE-2013-3459

HIGH · 7.8 CVSS v2.0 Published 2013-08-25
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 Unified Communications Manager (Unified CM) 7.1(x) before 7.1(5b)su6a does not properly handle errors, which allows remote attackers to cause a denial of service (service disruption) via malformed registration messages, aka Bug ID CSCuf93466.

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 · high confidence

Cisco Unified Communications Manager 7.1(x) versions before 7.1(5b)su6a fail to properly handle errors when processing malformed SIP registration messages. Remote attackers can send specially crafted registration messages that trigger the improper error handling, causing the service to become unavailable.

MitigationUpgrade Cisco Unified Communications Manager to version 7.1(5b)su6a or later to resolve the error handling deficiency in registration message processing.

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:= 7.1\(2a\)= 7.1\(2a\)su1= 7.1\(2b\)= 7.1\(2b\)su1= 7.1\(3\)= 7.1\(3a\)= 7.1\(3a\)su1= 7.1\(3a\)su1a= 7.1\(3b\)= 7.1\(3b\)su1= 7.1\(3b\)su2= 7.1\(5\)

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 installed CUCM version
    Log into the Cisco Unified Communications Manager Administration interface and navigate to About > Version, or run 'show version' via CLI on the CUCM server
    Affected if The installed version matches one of the listed affected versions: 7.1(2a), 7.1(2a)su1, 7.1(2b), 7.1(2b)su1, 7.1(3), 7.1(3a), 7.1(3a)su1, 7.1(3a)su1a, 7.1(3b), 7.1(3b)su1, 7.1(3b)su2, or 7.1(5)
  2. Verify SIP service is enabled
    In CUCM Administration, navigate to System > Service Parameters and check if the Cisco CallManager (SIP) service is activated, or verify SIP trunking/endpoints are configured
    Affected if SIP service is enabled and handling registration messages, which is required for the vulnerability to be exploitable
  3. Check for service availability issues
    Monitor the Cisco CallManager service status via the RTMT (Real Time Monitoring Tool) or check for recent service restarts or availability alerts in the system logs
    Affected if The Cisco CallManager service shows unexpected restarts or unavailability that correlates with potential malformed SIP registration attempts

You are affected if you are running any of the listed Cisco Unified Communications Manager 7.1 versions with SIP service enabled, as the vulnerability allows remote attackers to cause denial of service via malformed SIP registration messages.

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

Upgrade Cisco Unified Communications Manager to version 7.1(5b)su6a or later to resolve the error handling deficiency in registration message processing.

Fix this in Unified Communications Manager Scoped from the published advisory
  • Consultation4.0 h
  • Implementation6.0 h
  • Testing3.0 h
  • Review / QA2.0 h
15.0 hours of engineering $2,690
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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-2013-3459 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
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