CVE-2013-4563

Name: CVE-2013-4563
Creator: NVD / NIST
Published: 2013-11-20T13:19:41.697+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 3.90%

Last modified Jun 16, 2026

CVE-2013-4563 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 3.90% chance of exploitation in the next 30 days.

Description

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.

Metrics

EPSS Probability

3.90%

88.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-189

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	>= 3.9.8, <= 3.10.23
Linux	Linux Kernel	>= 3.11, < 3.12.4
Canonical	Ubuntu Linux	12.04
Canonical	Ubuntu Linux	13.10

References

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=0e033e04c2678dbbe74a46b23fffb7bb918c288eVendor Advisory
http://lists.opensuse.org/opensuse-security-announce/2014-02/msg00003.htmlMailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2013/11/13/9Mailing List, Patch
http://www.ubuntu.com/usn/USN-2113-1Third Party Advisory
http://www.ubuntu.com/usn/USN-2117-1Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1030015Issue Tracking
https://github.com/torvalds/linux/commit/0e033e04c2678dbbe74a46b23fffb7bb918c288eExploit, Patch
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=0e033e04c2678dbbe74a46b23fffb7bb918c288eVendor Advisory
http://lists.opensuse.org/opensuse-security-announce/2014-02/msg00003.htmlMailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2013/11/13/9Mailing List, Patch
http://www.ubuntu.com/usn/USN-2113-1Third Party Advisory
http://www.ubuntu.com/usn/USN-2117-1Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1030015Issue Tracking
https://github.com/torvalds/linux/commit/0e033e04c2678dbbe74a46b23fffb7bb918c288eExploit, Patch

Timeline

Published: Nov 20, 2013
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2013-4563?

How severe is CVE-2013-4563?

Severity scoring for CVE-2013-4563 is pending analysis. The EPSS model estimates a 3.90% probability of exploitation in the next 30 days.

How do I fix CVE-2013-4563?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2013-4563?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST