Unified Communications ManagerApplication · Cisco
CVE-2013-3453
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 · uneditedMemory leak in Cisco Unified Communications Manager IM and Presence Service before 8.6(5)SU1 and 9.x before 9.1(2), and Cisco Unified Presence, allows remote attackers to cause a denial of service (memory and CPU consumption) by making many TCP connections to port (1) 5060 or (2) 5061, aka Bug ID CSCud84959.
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 confidenceMemory leak in Cisco Unified Communications Manager IM and Presence Service and Cisco Unified Presence allows remote attackers to cause denial of service by establishing many TCP connections to SIP ports 5060 or 5061, leading to memory and CPU exhaustion.
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
<= 8.6\(4\)= 3.3\(5\)= 3.3\(5\)sr1= 3.3\(5\)sr2a= 4.1\(3\)= 4.1\(3\)sr1= 4.1\(3\)sr2= 4.1\(3\)sr3= 4.1\(3\)sr4= 4.2= 4.2.1= 4.2.2
Unified PresenceApplication
all versionsCVSS 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 checksWork through these to decide whether this CVE applies to you.
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Identify installed Cisco productDetermine if the system runs Cisco Unified Communications Manager (CUCM) or Cisco Unified Presence (CUP) by checking installed software packages or running 'show version' on the Cisco deviceAffected if The product is Cisco Unified Presence (any version) or Cisco Unified Communications Manager version 8.6(4) and below, 3.3(5)/3.3(5)sr1/3.3(5)sr2a, 4.1(3) through 4.1(3)sr4, or 4.2/4.2.1/4.2.2
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Verify SIP service is enabledCheck if the SIP service is active by querying the service status or reviewing the configuration for SIP port bindings on ports 5060 (UDP/TCP) and 5061 (TLS)Affected if SIP service is enabled and listening on ports 5060 or 5061
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Check network exposure of SIP portsScan or review firewall rules to determine if SIP ports 5060 and 5061 are exposed to untrusted networks or the internetAffected if SIP ports 5060 or 5061 are accessible from external or untrusted networks
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Monitor for connection exhaustionObserve system resources and TCP connection counts on the SIP service using 'show connections' or equivalent monitoring toolsAffected if A high number of concurrent TCP connections to SIP ports is observed, leading to memory or CPU exhaustion
You are affected if you run Cisco Unified Presence (any version) or a vulnerable Cisco Unified Communications Manager version with SIP ports 5060/5061 exposed to the network, as the memory leak can be triggered by establishing many TCP connections to these ports.
Generated from the published advisory. Verify against your own configuration.
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 dataUpgrade to Cisco Unified Communications Manager IM and Presence Service 8.6(5)SU1/9.1(2) or later. Implement rate limiting on SIP ports and firewall rules to restrict excessive connection attempts.
Fix this in Unified Communications Manager
Scoped from the published advisory
- Consultation4.0 h
- Implementation8.0 h
- Testing8.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,656.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2013-3453 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2013-3453 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
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