No exploitation reportedFix available

CVE-2019-11478

No exploitation reported by the sources we read.

Published2019-06-19
WeaknessCWE-400 · CWE-770

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Jonathan Looney discovered that the TCP retransmission queue implementation in tcp_fragment in the Linux kernel could be fragmented when handling certain TCP Selective Acknowledgment (SACK) sequences. 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 commit f070ef2ac66716357066b683fb0baf55f8191a2e.

Timeline

dates in UTC

2019-06-1900:15CVE publishedNVD
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2019-11478?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2019-11478?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Canonical ubuntu linux

Branch	Affected	Fixed in	Source
12.4	= 12.04	no fix published	NVD
14.4	= 14.04	no fix published	NVD
16.4	= 16.04	no fix published	NVD
18.4	= 18.04	no fix published	NVD
18.10	= 18.10	no fix published	NVD
19.4	= 19.04	no fix published	NVD

F5 big-ip access policy manager

Branch	Affected	Fixed in	Source
11.x	≥ 11.5.2, ≤ 11.6.4	no fix published	NVD
12.1	≥ 12.1.0, ≤ 12.1.4	no fix published	NVD
13.1	≥ 13.1.0, ≤ 13.1.1	no fix published	NVD
14.x	≥ 14.0.0, ≤ 14.1.0	no fix published	NVD
15.0	= 15.0.0	no fix published	NVD

F5 big-ip advanced firewall manager

Branch	Affected	Fixed in	Source
11.x	≥ 11.5.2, ≤ 11.6.4	no fix published	NVD
12.1	≥ 12.1.0, ≤ 12.1.4	no fix published	NVD
13.1	≥ 13.1.0, ≤ 13.1.1	no fix published	NVD
14.x	≥ 14.0.0, ≤ 14.1.0	no fix published	NVD
15.0	= 15.0.0	no fix published	NVD

21 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

git.kernel.orgPatch · Vendor Advisory
github.comPatch
wiki.ubuntu.comMitigation

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CNACVSS 3.05.3read 2026-10-23
NVDCVSS 3.07.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
CNAweakness (CWE)CWE-770read 2026-10-23
NVDweakness (CWE)CWE-400read 2026-10-23
FIRST EPSSEPSS score94.7 %read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2019-06-19
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2019-11478?

Is CVE-2019-11478 actively exploited?

Active exploitation of CVE-2019-11478 has not been confirmed. Its EPSS score was 94.7% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-11478?

CVE-2019-11478 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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