CVE-2013-4563

High

The udp6_ufo_fragment function in net/ipv6/udp_offload.c in the Linux kernel through 3.12, when UDP Fragmentation Offload (UFO) is enabled, does not properly perform a certain size comparison before inserting a fragment header, which allows remote attackers to cause a denial of service (panic) via a large IPv6 UDP packet, as demonstrated by use of the Token Bucket Filter (TBF) queueing discipline.

Package Linux Kernel
Published 2013-11-20
Last modified 2026-04-29
CVSS version 2.0
Patch available
Awaiting data

CVSS 2.0 score

7.1

out of 10
High
Attack Vector
Network
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
None
Integrity
None
Availability
Vector string
AV:N/AC:M/Au:N/C:N/I:N/A:C

Weakness type

CWE-189

CVE-2013-4563 is classified as CWE-189

See CWE-189 on MITRE CWE for full details on this weakness type.

References

The following references provide additional information about CVE-2013-4563 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Frequently asked questions

  • What is CVE-2013-4563?

    CVE-2013-4563 is a High severity Linux kernel vulnerability with a CVSS score of 7.1 out of 10 . CVE-2013-4563 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2013-4563?

    CVE-2013-4563 has a CVSS score of 7.1 out of 10, rated High severity (CVSS 2.0). The vector string is AV:N/AC:M/Au:N/C:N/I:N/A:C .

  • Is there a patch available for CVE-2013-4563?

    No patch is currently available for CVE-2013-4563. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

  • Is CVE-2013-4563 actively exploited?

    No — CVE-2013-4563 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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