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Unified Ip Conference Station 7937g FirmwareOperating system · Cisco

CVE-2013-3435

MEDIUM · 5.0 CVSS v2.0 Published 2013-07-23
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
The Cisco Unified IP Conference Station 7937G allows remote attackers to cause a denial of service (networking outage) via a flood of TCP packets, aka Bug ID CSCuh42052.

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

The Cisco Unified IP Conference Station 7937G is susceptible to a denial-of-service vulnerability where an attacker sending a flood of TCP packets can cause a complete networking outage on the device. This appears to be a classic resource exhaustion issue where the device cannot handle excessive incoming TCP connections or traffic.

MitigationApply the Cisco firmware update for CSCuh42052 when available, and implement network-level protections such as rate limiting, access control lists, or traffic filtering to limit exposure to external TCP floods.

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 Ip Conference Station 7937g FirmwareOperating system
Affected:all versions
Unified Ip Conference Station 7937gHardware / appliance
Affected:all versions

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
Partial

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

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 device model
    Access the device web interface or console and check the device identification. For the web interface, navigate to the device status page. From CLI, use the 'show version' command to confirm the model number is '7937G' or 'Cisco Unified IP Conference Station 7937G'.
    Affected if The device model is Cisco Unified IP Conference Station 7937G (any firmware version)
  2. Check firmware version
    From the device web interface, go to the Administration or System Information section to view the installed firmware version. From CLI, use 'show version' to display the firmware revision. Note that all firmware versions are affected.
    Affected if Any firmware version is installed on the 7937G device (all versions are affected)
  3. Assess network exposure
    Review the network configuration to determine if the device management interface or SIP ports are accessible from untrusted networks. Check router/switch ACLs and firewall rules protecting the device. The vulnerability is exploitable via TCP floods sent to the device.
    Affected if The device is directly accessible from external networks or untrusted LAN segments without rate limiting or ACL protection
  4. Check for DoS symptoms
    Monitor the device for network connectivity issues or complete networking outages. Use 'show network' or 'show interfaces' from the CLI to check for errors, drops, or interface status changes. Review any recent unexplained device reboots or loss of network connectivity.
    Affected if The device has experienced complete networking outages or shows high TCP connection counts under normal operation

A user is affected if they have a Cisco Unified IP Conference Station 7937G device (any firmware version) that is exposed to networks where an attacker can send TCP packet floods to the device.

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 Cisco firmware update for CSCuh42052 when available, and implement network-level protections such as rate limiting, access control lists, or traffic filtering to limit exposure to external TCP floods.

Fix this in Unified Ip Conference Station 7937g Firmware 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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Scan for this in your stack

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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-2013-3435 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
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