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No exploitation reportedFix available

CVE-2019-11479

No exploitation reported by the sources we read.

  • Published2019-06-19
  • Fixed in15.0.1.1 · 14.1.2.1 · 14.0.1.1 · 13.1.3.2 · 12.1.5.1 · 11.6.5.1
  • WeaknessCWE-405 · 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 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.

Timeline

dates in UTC
  1. 2019-06-1900:15CVE publishedNVD
  2. 2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 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-2019-11479?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2019-11479?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
F5 big-ip access policy manager
BranchAffectedFixed in
15.0≥ 15.0.0, < 15.0.1.115.0.1.1
14.1≥ 14.1.2, < 14.1.2.114.1.2.1
14.0≥ 14.0.0, < 14.0.1.114.0.1.1
13.1≥ 13.1.0, < 13.1.3.213.1.3.2
12.1≥ 12.1.0, < 12.1.5.112.1.5.1
11.x≥ 11.5.2, < 11.6.5.111.6.5.1
F5 big-ip advanced firewall manager
BranchAffectedFixed in
15.0≥ 15.0.0, < 15.0.1.115.0.1.1
14.1≥ 14.1.2, < 14.1.2.114.1.2.1
14.0≥ 14.0.0, < 14.0.1.114.0.1.1
13.1≥ 13.1.0, < 13.1.3.213.1.3.2
12.1≥ 12.1.0, < 12.1.5.112.1.5.1
11.x≥ 11.5.2, < 11.6.5.111.6.5.1
F5 big-ip analytics
BranchAffectedFixed in
15.0≥ 15.0.0, < 15.0.1.115.0.1.1
14.1≥ 14.1.2, < 14.1.2.114.1.2.1
14.0≥ 14.0.0, < 14.0.1.114.0.1.1
13.1≥ 13.1.0, < 13.1.3.213.1.3.2
12.1≥ 12.1.0, < 12.1.5.112.1.5.1
11.x≥ 11.5.2, < 11.6.5.111.6.5.1

18 more products in the sources.

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

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • ICSMA-20-170-06 CISA1 known affected

    BD Alaris PCU (Update A)

    Alaris PC Unit: Versions 9.13 9.19 9.33 and 12.1

Full record on NVD

Fix

  1. Update F5 big-ip access policy manager to 15.0.1.1 · 14.1.2.1 · 14.0.1.1 · 13.1.3.2 · 12.1.5.1 · 11.6.5.1
  2. Vendor fix CISA ICSMA-20-170-06 · 1 productBD recommends the following to help reduce the risks associated with this third-party vulnerability:
  3. Vendor fix CISA ICSMA-20-170-06 · 1 productFor more information on this issue, please see the associated BD product security bulletin on the BD website.
  4. Vendor fix CISA ICSMA-20-170-06 · 1 productFor more information on BD 's product security and vulnerability management, contact the BD product security office.

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • NVDCVSS 3.17.5read 2026-10-23
  • CNACVSS 3.05.3read 2026-10-23
  • NVDCVSS 2.05read 2026-10-23
  • CNAweakness (CWE)CWE-405read 2026-10-23
  • NVDweakness (CWE)CWE-770read 2026-10-23
  • FIRST EPSSEPSS score91.7 %read 2026-10-23

Technical details

CVSS v3 Vector
CVSS:3.1/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-2019-11479?

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.

Is CVE-2019-11479 actively exploited?

Active exploitation of CVE-2019-11479 has not been confirmed. Its EPSS score was 91.7% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-11479?

CVE-2019-11479 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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