CVE-2013-4563

HIGHCVSS v2 · 7.17.1
EchelonGraph scoreLOW confidence

“—” beside the score: it is equal to NVD's CVSS v2 base score.

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 7.1 — NVD rates that HIGH (NVD's v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; no CRITICAL band). Vector AV:N/AC:M/Au:N/C:N/I:N/A:C. CVSS v2 is an older, coarser metric than v3.1/v4.0 (no Scope, no User Interaction, no Attack Requirements), so it is not directly comparable to a v3 or v4 score. NVD has never re-scored this record under v3. EPSS predicts 3.9% exploitation probability in the next 30 days; it does not lift the v2 base. EPSS sets EG Risk's exploitation input. Confidence: LOW.

Triggered by: NVD CVSS v2.0 (legacy fallback)
Sources: NVD CVSS v2.0
7.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 3.9%CVSS v2: 7.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v2.0 (legacy)
7.1HIGHNVD never assigned a CVSS v3 rating to this CVE
EG Score
7.1HIGHlow confidence
EG Risk
34
EG Risk 34/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity71% × 45%
The EG Score, 7.1 of 10.
Exploitation3.9% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's BOD 26-04 default: no one has published Automatable for this CVE, and CISA treats it as “no” for a CVE not in KEV.
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
3.9%
EPSS %ILE
90th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

November 20, 2013

Last Modified

April 29, 2026

References (7)

Patch Availability(2)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-image-3.11.0-17-generic-lpae (3.11.0-17.31~precise1) @ precise2026-05-28ubuntu
ubuntulinux-image-3.11.0-17-generic-lpae (3.11.0-17.31) @ saucy2026-05-28ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 3.11.10-1: fixed in 3.11.10-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 3.11.10-1: fixed in 3.11.10-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 3.11.10-1: fixed in 3.11.10-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 3.11.10-1: fixed in 3.11.10-1
—

All Vendor Advisories

(2)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 9× in last 7d / 23× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 89 of 146 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 11 repeat rows among the latest 100 are merged into the row they repeat. The 57 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-12 21:23 UTCEG score recompute
  2. 2026-10-12 16:27 UTCEPSS rescoreEPSS 3.9% · 90th percentile
  3. 2026-10-12 01:30 UTCEG score recompute
  4. 2026-10-11 13:39 UTCEPSS rescoreEPSS 3.9% · 90th percentile
  5. 2026-10-10 19:54 UTCEPSS rescoreEPSS 3.9% · 90th percentile
  6. 2026-10-09 20:01 UTCEPSS rescoreEPSS 3.9% · 90th percentile
  7. 2026-10-08 16:34 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  8. 2026-10-07 23:39 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  9. 2026-10-06 15:11 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  10. 2026-10-05 17:38 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  11. 2026-10-04 23:16 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  12. 2026-09-30 14:58 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  13. 2026-09-30 01:10 UTCOSV refresh
  14. 2026-09-30 00:13 UTCEG score recompute
  15. 2026-09-28 13:45 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  16. 2026-09-27 13:39 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  17. 2026-09-26 15:53 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  18. 2026-09-21 20:25 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  19. 2026-09-20 20:08 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  20. 2026-09-18 19:21 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  21. 2026-09-17 19:21 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  22. 2026-09-15 03:04 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  23. 2026-09-13 16:41 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  24. 2026-09-12 14:55 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  25. 2026-09-11 09:30 UTCEPSS rescoreEPSS 3.9% · 89th percentile
Show 64 more
  1. 2026-09-11 01:23 UTCOSV refresh
  2. 2026-09-07 15:56 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  3. 2026-09-04 13:55 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  4. 2026-08-30 19:12 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  5. 2026-08-27 14:20 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  6. 2026-08-26 14:41 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  7. 2026-08-25 13:43 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  8. 2026-08-23 15:52 UTCOSV refresh
  9. 2026-08-23 00:13 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  10. 2026-08-21 23:44 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  11. 2026-08-20 22:50 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  12. 2026-08-19 16:59 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  13. 2026-08-18 13:43 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  14. 2026-08-16 14:50 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  15. 2026-08-16 02:09 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  16. 2026-08-15 01:25 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  17. 2026-08-09 13:42 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  18. 2026-08-08 16:31 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  19. 2026-08-07 16:49 UTCOSV refresh
  20. 2026-08-07 16:21 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  21. 2026-08-06 13:42 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  22. 2026-08-05 19:12 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  23. 2026-08-04 15:04 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  24. 2026-08-01 04:11 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  25. 2026-07-30 16:23 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  26. 2026-07-30 01:26 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  27. 2026-07-28 15:31 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  28. 2026-07-26 13:48 UTCEG score recomputeFirst assessed: 7.1 HIGH
  29. 2026-07-23 14:14 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  30. 2026-07-23 01:10 UTCEG score recompute
  31. 2026-07-23 00:14 UTCEG score recompute
  32. 2026-07-22 21:52 UTCEG score recompute
  33. 2026-07-22 14:04 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  34. 2026-07-22 09:37 UTCOSV refresh
  35. 2026-07-21 15:21 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  36. 2026-07-20 17:03 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  37. 2026-07-19 14:27 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  38. 2026-07-19 02:25 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  39. 2026-07-18 10:00 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  40. 2026-07-16 16:58 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  41. 2026-07-15 16:54 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  42. 2026-07-15 01:56 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  43. 2026-07-13 22:26 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  44. 2026-07-12 05:42 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  45. 2026-07-09 19:05 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  46. 2026-07-08 15:10 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  47. 2026-07-07 13:41 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  48. 2026-07-06 02:19 UTCEPSS rescoreEPSS 3.9% · 89th percentile
  49. 2026-07-05 04:51 UTCOSV refresh
  50. 2026-07-05 02:26 UTCEPSS rescoreEPSS 3.9% · 88th percentile
  51. 2026-07-04 06:27 UTCEPSS rescoreEPSS 3.9% · 88th percentile
  52. 2026-07-02 15:21 UTCEPSS rescoreEPSS 3.9% · 88th percentile
  53. 2026-07-01 15:02 UTCEPSS rescoreEPSS 3.9% · 88th percentile
  54. 2026-06-30 23:19 UTCEPSS rescoreEPSS 3.9% · 88th percentile
  55. 2026-06-29 14:02 UTCEPSS rescoreEPSS 3.9% · 88th percentile
  56. 2026-06-28 14:03 UTCEPSS rescoreEPSS 3.9% · 88th percentile
  57. 2026-06-28 04:53 UTCEPSS rescoreEPSS 3.9% · 88th percentile
  58. 2026-06-27 03:05 UTCEPSS rescoreEPSS 3.9% · 88th percentile
  59. 2026-06-25 13:47 UTCEPSS rescoreEPSS 3.9% · 88th percentile
  60. 2026-06-24 14:02 UTCEPSS rescoreEPSS 3.9% · 88th percentile
  61. 2026-06-23 21:30 UTCEPSS rescoreEPSS 3.9% · 88th percentile
  62. 2026-06-22 14:22 UTCEPSS rescoreEPSS 3.9% · 88th percentile
  63. 2026-06-21 14:53 UTCEPSS rescoreEPSS 3.9% · 88th percentile
  64. 2026-06-21 01:57 UTCEPSS rescoreEPSS 3.9% · 88th percentile

Related CVEs(same vendor)

Frequently asked(4)

What is CVE-2013-4563?
CVE-2013-4563 is a high-severity vulnerability; its CVE record was published on November 20, 2013. The udp6ufofragment 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…
When was CVE-2013-4563 made public?
CVE-2013-4563 was made public on November 13, 2013: that is the date its CVE record's CNA, Red Hat, Inc., gives for when the vulnerability was made public. The CVE record itself was published on November 20, 2013. EchelonGraph's copy of the record carries a last-modified date of April 29, 2026; the record at its source may have been updated since.
Is CVE-2013-4563 actively exploited?
CVE-2013-4563 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3.9% probability of exploitation in the next 30 days (90th percentile of EPSS-scored CVEs).
How do I remediate CVE-2013-4563?
A fix for CVE-2013-4563 is available: update to the fixed version the vendor names in its advisory.

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