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Wireless Lan ControllerApplication · Cisco

CVE-2015-0756

MEDIUM · 6.1 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 →
66/100
Remediation priority · Elevated
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 Wireless LAN Controller (WLC) devices with software 7.4(1.1) allow remote attackers to cause a denial of service (wireless-networking outage) via crafted TCP traffic on the local network, aka Bug ID CSCug67104.

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

Cisco Wireless LAN Controller (WLC) devices running software version 7.4(1.1) contain a denial of service vulnerability where remote attackers on the local network can cause wireless networking outages by sending crafted TCP traffic to the affected device. This vulnerability resides in the TCP processing logic of the WLC and can result in complete loss of wireless connectivity.

MitigationUpgrade Cisco WLC software to a patched version beyond 7.4(1.1); as a temporary workaround, implement network segmentation and access controls to restrict TCP traffic on the local network to trusted sources only.

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
Wireless Lan ControllerApplication
Affected:= 7.4\(1.1\)

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
Adjacent
Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Complete

AV:A/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. Confirm device is a Cisco Wireless LAN Controller
    Access the device CLI and run 'show inventory' or 'show version' to identify the device model
    Affected if Device model is not a Cisco Wireless LAN Controller (not vulnerable)
  2. Check the exact software version
    Run 'show version' and locate the software version string in the output
    Affected if Version displayed is exactly 7.4(1.1) (vulnerable)
  3. Verify management interface is active
    Run 'show interface summary' or 'show run-config' to confirm TCP-based management interfaces are enabled
    Affected if Management interfaces are configured and reachable (prerequisite for remote attack)

Device is affected only if it is a Cisco Wireless LAN Controller running exactly version 7.4(1.1) with management interfaces enabled.

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 WLC software to a patched version beyond 7.4(1.1); as a temporary workaround, implement network segmentation and access controls to restrict TCP traffic on the local network to trusted sources only.

Fix this in Wireless Lan Controller Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA1.0 h
10.0 hours of engineering $1,750
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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-2015-0756 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