CVE-2019-11479

HIGHNVD 7.59.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because EPSS predicts 92% probability of exploitation within the next 30 days (top 0.2% of all CVEs). NVD baseline CVSS 7.5 retained for reference. Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss, ghsa, nvd
Trending — 5 sources updated this weekElevated
7.5
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 92%
CISA-KEV: Not listedEPSS: 92%CVSS: 7.5Exploit: NoneExposed: 0

A fix is available — apply it.

Jonathan Looney discovered that the Linux kernel default MSS is hard-coded to 48 bytes. This allows a remote peer to fragment TCP resend queues significantly more than if a larger MSS were enforced. A remote attacker could use this to cause a denial of service. This has been fixed in stable kernel releases 4.4.182, 4.9.182, 4.14.127, 4.19.52, 5.1.11, and is fixed in commits 967c05aee439e6e5d7d805e195b3a20ef5c433d6 and 5f3e2bf008c2221478101ee72f5cb4654b9fc363.

CVSS v3
7.5
EG Score
9.0(high)
EG Risk
—
EPSS
99.8%
KEV
Not listed

Published

June 19, 2019

Last Modified

November 21, 2024

References (56)

Patch Availability(17)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-image-virtual-lts-xenial (4.4.0.154.162) @ xenial2026-05-27ubuntu
ubuntulinux-image-4.15.0-1049-azure (4.15.0-1049.54~14.04.1) @ trusty2026-05-27ubuntu
redhatredhat-virtualization-host-0:4.3.4-20190620.3.el7_62019-07-08redhat
redhatredhat-virtualization-host-0:4.2-20190618.0.el7_62019-06-25redhat
redhatkernel-alt-0:4.14.0-115.8.2.el7a2019-06-25redhat
redhatkernel-0:3.10.0-862.34.2.el72019-06-17redhat
redhatkernel-0:2.6.32-504.79.3.el62019-06-17redhat
redhatkernel-0:3.10.0-327.79.2.el72019-06-17redhat
redhatkernel-0:3.10.0-514.66.2.el72019-06-17redhat
redhatkernel-0:3.10.0-693.50.3.el72019-06-17redhat
redhatkernel-0:2.6.32-754.15.3.el62019-06-17redhat
redhatkernel-0:2.6.32-431.95.3.el62019-06-17redhat
redhatkernel-0:4.18.0-80.4.2.el8_02019-06-17redhat
redhatkernel-rt-1:3.10.0-693.50.3.rt56.644.el6rt2019-06-17redhat
redhatkernel-rt-0:3.10.0-957.21.3.rt56.935.el72019-06-17redhat
redhatkernel-0:3.10.0-957.21.3.el72019-06-17redhat
redhatkernel-rt-0:4.18.0-80.4.2.rt9.152.el8_02019-06-17redhat

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.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(17)

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 10× in last 7d / 18× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

  1. 2026-07-22 21:29 UTCEG score recompute▲ 1.50
  2. 2026-07-22 21:29 UTCVendor advisory
  3. 2026-07-22 21:29 UTCGHSA enrichment
  4. 2026-07-22 14:05 UTCEPSS rescore
  5. 2026-07-20 14:34 UTCOSV refresh
  6. 2026-07-19 02:26 UTCEPSS rescore
  7. 2026-07-19 02:26 UTCEPSS rescore
  8. 2026-07-18 10:01 UTCEPSS rescore
  9. 2026-07-16 16:59 UTCEPSS rescore
  10. 2026-07-16 16:59 UTCEPSS rescore
  11. 2026-07-09 19:06 UTCEPSS rescore
  12. 2026-07-03 09:56 UTCOSV refresh
  13. 2026-07-01 15:03 UTCEPSS rescore
  14. 2026-07-01 15:03 UTCEPSS rescore
  15. 2026-06-27 03:06 UTCEPSS rescore
  16. 2026-06-27 03:06 UTCEPSS rescore
  17. 2026-06-23 21:30 UTCEPSS rescore
  18. 2026-06-23 21:30 UTCEPSS rescore
  19. 2026-06-18 17:50 UTCEPSS rescore
  20. 2026-06-17 17:50 UTCEPSS rescore
  21. 2026-06-15 17:45 UTCEPSS rescore
  22. 2026-06-15 00:13 UTCOSV refresh
  23. 2026-06-14 23:15 UTCEPSS rescore
  24. 2026-06-14 23:15 UTCEPSS rescore
  25. 2026-06-13 22:58 UTCEPSS rescore
Show 33 more
  1. 2026-06-12 23:09 UTCEPSS rescore
  2. 2026-06-11 13:58 UTCEPSS rescore
  3. 2026-06-11 13:58 UTCEPSS rescore
  4. 2026-06-10 22:16 UTCEPSS rescore
  5. 2026-06-10 13:19 UTCEPSS rescore
  6. 2026-06-07 15:23 UTCEPSS rescore
  7. 2026-06-07 15:22 UTCEPSS rescore
  8. 2026-06-06 13:45 UTCEPSS rescore
  9. 2026-06-06 13:45 UTCEPSS rescore
  10. 2026-06-05 22:45 UTCEPSS rescore
  11. 2026-06-05 22:45 UTCEPSS rescore
  12. 2026-06-05 06:08 UTCEPSS rescore
  13. 2026-06-05 06:08 UTCEPSS rescore
  14. 2026-06-04 13:10 UTCEPSS rescore
  15. 2026-06-04 13:10 UTCEPSS rescore
  16. 2026-06-02 20:11 UTCEPSS rescore
  17. 2026-06-01 13:50 UTCEPSS rescore
  18. 2026-06-01 13:50 UTCEPSS rescore
  19. 2026-05-31 22:29 UTCEPSS rescore
  20. 2026-05-31 22:29 UTCEPSS rescore
  21. 2026-05-31 00:14 UTCEPSS rescore
  22. 2026-05-31 00:14 UTCEPSS rescore
  23. 2026-05-29 13:42 UTCEPSS rescore
  24. 2026-05-28 13:43 UTCEPSS rescore
  25. 2026-05-27 18:14 UTCEG score recompute
  26. 2026-05-27 18:14 UTCVendor advisory
  27. 2026-05-27 18:14 UTCGHSA enrichment
  28. 2026-05-27 13:38 UTCEPSS rescore
  29. 2026-05-26 13:42 UTCEPSS rescore
  30. 2026-05-26 13:42 UTCEPSS rescore
  31. 2026-05-26 07:17 UTCEPSS rescore
  32. 2026-05-26 07:17 UTCEPSS rescore
  33. 2026-05-24 00:22 UTCOSV refresh

Frequently asked(5)

What is CVE-2019-11479?
CVE-2019-11479 is a high vulnerability published on June 19, 2019. Jonathan Looney discovered that the Linux kernel default MSS is hard-coded to 48 bytes. This allows a remote peer to fragment TCP resend queues significantly more than if a larger MSS were enforced. A remote attacker could use this to cause a denial of service. This has been fixed in stable kernel…
When was CVE-2019-11479 disclosed?
CVE-2019-11479 was first published in the National Vulnerability Database on June 19, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2019-11479 actively exploited?
CVE-2019-11479 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2019-11479?
CVE-2019-11479 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
How do I remediate CVE-2019-11479?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-11479, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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