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iOSOperating system · Cisco

CVE-2010-4684

HIGH · 7.1 CVSS v2.0 Published 2011-01-07
Fix available
A fix is available. Upgrade to 15.0 or later.
See remediation →
80/100
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
Cisco IOS before 15.0(1)XA1, when certain TFTP debugging is enabled, allows remote attackers to cause a denial of service (device crash) via a TFTP copy over IPv6, aka Bug ID CSCtb28877.

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 denial of service vulnerability in Cisco IOS versions prior to 15.0(1)XA1 allows remote attackers to crash affected devices by sending a TFTP copy request over IPv6 when specific TFTP debugging is enabled. The vulnerability is triggered by crafted TFTP operations and results in complete device failure.

MitigationUpgrade Cisco IOS to version 15.0(1)XA1 or later. As interim workarounds, disable TFTP debugging if not required or disable IPv6 if not needed for operations.

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
Affected:< 15.0\(1\)xa1

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
M
Authentication
None
Confidentiality
None
Integrity
None
Availability
Complete

AV:N/AC:M/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. Check the Cisco IOS version
    Run the command 'show version' and locate the version string in the output. Look for the main IOS version number (e.g., 12.4, 12.5, 14.x, 15.0, etc.)
    Affected if The version number is below 15.0(1)XA1 (such as 12.x, 14.x, or early 15.0 versions)
  2. Verify if IPv6 is enabled
    Run 'show ipv6 interface brief' to see IPv6 interface status, or check the running configuration for 'ipv6 unicast-routing' or ipv6 interface configurations
    Affected if IPv6 interfaces are configured or IPv6 routing is enabled on the device
  3. Confirm if TFTP debugging is active
    Run 'show debugging' to list all currently enabled debug options, or check the running config for any 'debug' commands related to tftp or file transfer operations
    Affected if Debugging for TFTP or file transfer operations is currently enabled

The device is affected only if it runs Cisco IOS version prior to 15.0(1)XA1 AND has IPv6 enabled AND has TFTP debugging enabled, as all three conditions must be present for the vulnerability to be exploitable.

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
Upgrade available Upgrade to 15.0 or later
Fixed in 15.0
Interim mitigation

Upgrade Cisco IOS to version 15.0(1)XA1 or later. As interim workarounds, disable TFTP debugging if not required or disable IPv6 if not needed for operations.

Fix this in iOS Scoped from the published advisory
  • Consultation4.0 h
  • Implementation6.0 h
  • Testing3.0 h
  • Review / QA2.0 h
15.0 hours of engineering $2,690
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,304.

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-2010-4684 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