CVE-2013-4563
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.
Key facts
- CVSS score
- 7.1 (v2.0)
- Severity
- HIGH
- CVSS vector
AV:N/AC:M/Au:N/C:N/I:N/A:C- Weakness (CWE)
- CWE-189
- EPSS score
- 3.9% (90th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2013-4421)
- Published
- November 20, 2013
- NVD last modified
- June 16, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2013-4421 in the EU Vulnerability Database. Last updated in EUVD on August 6, 2024.
View on the EU Vulnerability DatabaseAffected products
- canonical / ubuntu linux
- canonical / ubuntu linux
- linux / linux kernel
References
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=0e033e04c2678dbbe74a46b23fffb7bb918c288e(Vendor Advisory)
- http://lists.opensuse.org/opensuse-security-announce/2014-02/msg00003.html(Mailing List, Third Party Advisory)
- http://www.openwall.com/lists/oss-security/2013/11/13/9(Mailing List, Patch)
- http://www.ubuntu.com/usn/USN-2113-1(Third Party Advisory)
- http://www.ubuntu.com/usn/USN-2117-1(Third Party Advisory)
- https://bugzilla.redhat.com/show_bug.cgi?id=1030015(Issue Tracking)
- https://github.com/torvalds/linux/commit/0e033e04c2678dbbe74a46b23fffb7bb918c288e(Exploit, Patch)
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
Query CVEs from your AI assistant
The CVE/NVD Explorer brain answers CVE questions directly inside Claude, ChatGPT, or any MCP assistant — always up to date, no setup. Add it once and stop pasting advisories into chat.
Add the CVE brain