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Asr 1000 Series SoftwareApplication · Cisco

CVE-2015-6274

MEDIUM · 5.0 CVSS v2.0 Published 2015-09-02
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
59/100
Remediation priority · Elevated
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
The IPv4 implementation on Cisco ASR 1000 devices with software 15.5(3)S allows remote attackers to cause a denial of service (ESP QFP CPU consumption) by triggering packet fragmentation and reassembly, aka Bug ID CSCuv71273.

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

Denial of service vulnerability in the IPv4 implementation on Cisco ASR 1000 series routers. Remote attackers can trigger packet fragmentation and reassembly to cause excessive ESP (Embedded Services Processor) QFP (Quantum Flow Processor) CPU consumption, rendering the device unavailable.

MitigationApply the Cisco software update that addresses CSCuv71273. For production environments, schedule a maintenance window and ensure validated backup configurations before upgrading the ASR 1000 firmware.

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
Asr 1000 Series SoftwareApplication
Affected:= 15.5\(3\)s

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
None
Confidentiality
None
Integrity
None
Availability
Partial

AV:N/AC:L/Au:N/C:N/I:N/A:P

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 Cisco ASR 1000 series router
    Execute 'show version' or 'show platform' from the device CLI and confirm the hardware model is ASR 1000 Series Aggregation Services Router
    Affected if Device is a Cisco ASR 1000 series router
  2. Check installed software version
    Execute 'show version' and locate the software version string (IOS/IOS-XE version) displayed in the output
    Affected if Version displayed is exactly 15.5(3)s
  3. Verify IPv4 feature is active
    Confirm the router has IPv4 routing enabled by checking 'show ip interface brief' or 'show ip route' - the vulnerability requires IPv4 to be configured and active
    Affected if IPv4 routing is enabled on the device

A Cisco ASR 1000 series router running exactly version 15.5(3)s with IPv4 routing enabled is affected by this vulnerability.

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

Apply the Cisco software update that addresses CSCuv71273. For production environments, schedule a maintenance window and ensure validated backup configurations before upgrading the ASR 1000 firmware.

Fix this in Asr 1000 Series Software Scoped from the published advisory
  • Consultation2.0 h
  • Implementation3.0 h
  • Testing2.0 h
  • Review / QA1.0 h
8.0 hours of engineering $1,420
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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-2015-6274 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