iOSOperating system · Cisco
CVE-2012-1338
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 · uneditedCisco IOS 15.0 and 15.1 on Catalyst 3560 and 3750 series switches allows remote authenticated users to cause a denial of service (device reload) by completing local web authentication quickly, aka Bug ID CSCts88664.
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 confidenceThis is a denial of service vulnerability in Cisco IOS 15.0 and 15.1 on Catalyst 3560 and 3750 series switches. An authenticated remote user can trigger a device reload by rapidly completing local web authentication, causing the switch to crash and require manual restart.
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
iOSOperating system
= 15.0= 15.1
Catalyst 3560Hardware / appliance
all versions
Catalyst 3560 EHardware / appliance
all versions
Catalyst 3560 XHardware / appliance
all versions
Catalyst 3750Hardware / appliance
all versions
Catalyst 3750 EHardware / appliance
all versions
Catalyst 3750 XHardware / appliance
all versions
Catalyst 3750 MetroHardware / appliance
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
- M
- Authentication
- Single
- Confidentiality
- None
- Integrity
- None
- Availability
- Complete
AV:N/AC:M/Au:S/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 the switch modelRun 'show version' or 'show inventory' to confirm the device is a Catalyst 3560 or 3750 series switch (including 3560 E, 3560 X, 3750, 3750 E, 3750 X, or 3750 Metro variants)Affected if The device model is any Catalyst 3560 or 3750 series variant listed in the affected products
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Check the Cisco IOS versionRun 'show version' and look for the IOS version number in the output. Compare it to the affected versions 15.0 and 15.1Affected if The IOS version is exactly 15.0 or 15.1 (or any 15.0.x or 15.1.x release)
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Verify if local web authentication is enabledRun 'show running-config | include web-auth' or check the authentication configuration with 'show authentication session interface' to see if web-based (local) authentication is configuredAffected if Local web authentication (web-based authentication) is enabled on the switch
You are affected if you are running Cisco IOS 15.0 or 15.1 on a Catalyst 3560 or 3750 series switch with local web authentication enabled.
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 Cisco IOS to a version beyond 15.1 that includes the fix for Bug ID CSCts88664. If immediate upgrade is not feasible, consider disabling local web authentication or restricting network access to trusted authenticated users only.
Fix this in iOS
Scoped from the published advisory
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,600.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2012-1338 — 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-2012-1338 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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