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Unified Communications ManagerApplication · Cisco

CVE-2008-1742

HIGH · 7.8 CVSS v2.0 Published 2008-05-16
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
Memory leak in the Certificate Trust List (CTL) Provider service in Cisco Unified Communications Manager (CUCM) 5.x before 5.1(3) allows remote attackers to cause a denial of service (memory consumption and service interruption) via a series of malformed TCP packets, as demonstrated by TCPFUZZ, aka Bug ID CSCsj80609.

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

A memory leak vulnerability exists in the Certificate Trust List (CTL) Provider service of Cisco Unified Communications Manager (CUCM) versions 5.x prior to 5.1(3). Remote attackers can trigger this DoS condition by sending a series of malformed TCP packets (as demonstrated by the TCPFUZZ tool), causing excessive memory consumption and service interruption.

MitigationUpgrade Cisco CUCM to version 5.1(3) or later to patch the memory leak in the CTL Provider service. Consider implementing network-level filtering to block malformed TCP packets as an interim control.

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:= 4.1= 4.2= 4.3= 5.1= 6.0= 6.1

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 Cisco CUCM installation and version
    Access the Cisco Unified Communications Manager Administration interface (https://<server>/ccmadmin) and navigate to System > Version, or use the CLI command 'show version' via SSH to the CUCM server to determine the installed version.
    Affected if The displayed version matches 4.1, 4.2, 4.3, 5.1, 6.0, or 6.1 exactly.
  2. Verify CTL Provider service status
    Log into the CUCM Serviceability page (https://<server>/ccmservice) and navigate to Tools > Service Activation, or use the CLI command 'show service' to list active services.
    Affected if The CTL Provider service is listed as Running or Activated.
  3. Monitor memory consumption of CTL Provider
    In the CUCM Serviceability page, go to Tools > Real Time Monitoring Tool (RTMT) and track the memory usage for the CTL Provider service process over time. Alternatively, observe if the process memory grows abnormally during normal or malformed TCP traffic.
    Affected if Memory usage of the CTL Provider service shows continuous growth without stabilizing, leading to high memory consumption.
  4. Check for service interruptions
    Review CUCM system logs (System > Log Viewer in Administration interface) or RTMT alerts for crash reports, service failures, or unexpected restarts of the CTL Provider service.
    Affected if The CTL Provider service has restarted unexpectedly or shows error messages related to memory exhaustion.

You are affected if your CUCM version is 4.1, 4.2, 4.3, 5.1, 6.0, or 6.1 and the CTL Provider service is running and exhibiting high memory consumption or service instability.

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 CUCM to version 5.1(3) or later to patch the memory leak in the CTL Provider service. Consider implementing network-level filtering to block malformed TCP packets as an interim control.

Fix this in Unified Communications Manager Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing2.0 h
  • Review / QA1.0 h
9.0 hours of engineering $1,600
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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-2008-1742 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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