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Ios XeOperating system · Cisco

CVE-2015-0709

MEDIUM · 6.8 CVSS v2.0 Published 2015-04-29
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
74/100
Remediation priority · Elevated
Remotely reachable 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 15.5S and IOS XE allow remote authenticated users to cause a denial of service (device crash) by leveraging knowledge of the RADIUS secret and sending crafted RADIUS packets, aka Bug ID CSCur21348.

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

Vulnerability in Cisco IOS 15.5S and IOS XE allows remote authenticated users who possess the RADIUS shared secret to send crafted RADIUS packets that cause the device to crash, resulting in denial of service.

MitigationUpdate to a patched Cisco IOS/IOS XE version and rotate the RADIUS shared secret to prevent exploitation by unauthorized parties who may have obtained the credentials.

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
Ios XeOperating system
Affected:all versions
iOSOperating system
Affected:= 15.5\(3\)s= 15.5s

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
Single
Confidentiality
None
Integrity
None
Availability
Complete

AV:N/AC:L/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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify the Cisco IOS or IOS XE version
    Execute 'show version' on the device CLI and note the software version string (e.g., 15.5(3)S, 15.5S, or IOS XE version)
    Affected if The version is Cisco iOS 15.5(3)S, 15.5S, or any Cisco IOS XE version
  2. Determine if RADIUS is configured
    Execute 'show running-config | include radius' or 'show aaa servers' to check for RADIUS server definitions and authentication/authorization configuration using RADIUS
    Affected if RADIUS is actively configured and the device uses RADIUS for authentication or accounting
  3. Verify RADIUS shared secret is in use
    Execute 'show radius' or 'show aaa server radius' to confirm RADIUS server entries with active shared secrets configured
    Affected if RADIUS servers are defined with shared secrets on the device
  4. Confirm feature set supports RADIUS
    Check 'show version' for the feature set and verify the device has the securityk9 or similar feature set that enables AAA and RADIUS functionality
    Affected if The device has the security features enabled that allow RADIUS-based authentication

The device is affected if it runs Cisco iOS 15.5(3)S, 15.5S, or any Cisco IOS XE version AND has RADIUS configured with an active shared secret.

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

Update to a patched Cisco IOS/IOS XE version and rotate the RADIUS shared secret to prevent exploitation by unauthorized parties who may have obtained the credentials.

Fix this in Ios Xe Scoped from the published advisory
  • Consultation4.0 h
  • Implementation6.0 h
  • Testing2.0 h
  • Review / QA2.0 h
14.0 hours of engineering $2,540
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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-2015-0709 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