iOSOperating system · Cisco
CVE-2012-1317
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 · uneditedThe multicast implementation in Cisco IOS before 15.1(1)SY allows remote attackers to cause a denial of service (Route Processor crash) by sending packets at a high rate, aka Bug ID CSCts37717.
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 confidenceA vulnerability exists in the multicast implementation of Cisco IOS versions prior to 15.1(1)SY that allows remote attackers to cause a denial of service by sending packets at a high rate, resulting in a Route Processor crash.
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
= 15.1CVSS 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
- High
- Authentication
- None
- Confidentiality
- None
- Integrity
- None
- Availability
- Complete
AV:N/AC:H/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 Cisco IOS versionExecute 'show version' on the device and locate the IOS release line (e.g., 'Cisco IOS Software, 15.1')Affected if The version is 15.1 (without the 1SY patch series) or earlier, specifically if it shows 15.1 without (1SY) or later subversion
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Confirm multicast routing is enabledExecute 'show running-config | include multicast' or 'show ip multicast interface'Affected if Multicast routing (ip multicast-routing) is enabled in the configuration - the vulnerability only affects systems using multicast
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Verify if the device processes multicast trafficCheck interface configurations with 'show ip multicast interface' and review which interfaces have multicast enabledAffected if Any interfaces are configured for PIM or other multicast protocols and actively processing multicast traffic
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Inspect for existing traffic filteringReview access-lists with 'show access-lists' and check for any ACL entries referencing multicast ranges (224.0.0.0/4)Affected if No ACLs or rate-limiting controls are in place to filter or limit high-rate multicast traffic
A system is affected if it runs Cisco IOS version 15.1 (or earlier) and has multicast routing enabled with interfaces actively processing multicast traffic, as the vulnerability triggers via high-rate multicast packets to the Route Processor.
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 version 15.1(1)SY or later to patch the vulnerability. Alternatively, implement rate limiting or ACLs on multicast traffic as a compensating control until the upgrade can be performed.
Fix this in iOS
Scoped from the published advisory
- Consultation3.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,880.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2012-1317 — 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-2012-1317 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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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.
- 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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