HOME VULNERABILITIESCVE-2019-11479

HIGH

CVE-2019-11479

CWE-405Published: June 19, 2019· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official 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.

Technical Analysis

CVE-2019-11479 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

Canonical1 product(s)

ubuntu linux

f517 product(s)

big-ip advanced firewall managerbig-ip access policy managerbig-ip application acceleration managerbig-ip link controllerbig-ip policy enforcement managerbig-ip webacceleratorbig-ip application security managerbig-ip local traffic managerbig-ip fraud protection servicebig-ip global traffic managerbig-ip analyticsbig-ip edge gateway+5

Linux1 product(s)

linux kernel

Red Hat2 product(s)

enterprise linuxvirtualization host

Source: NVD CPE · 25 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

CVE Program entry

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=5f3e2bf008c2221478101ee72f5cb4654b9fc363

PATCHhttps://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=967c05aee439e6e5d7d805e195b3a20ef5c433d6

PATCHhttps://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-001.md

PATCHhttps://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=5f3e2bf008c2221478101ee72f5cb4654b9fc363

PATCHhttps://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=967c05aee439e6e5d7d805e195b3a20ef5c433d6

PATCHhttps://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-001.md

ADVISORYhttp://www.arubanetworks.com/assets/alert/ARUBA-PSA-2020-010.txt

ADVISORYhttp://www.openwall.com/lists/oss-security/2019/06/28/2

ADVISORYhttp://www.openwall.com/lists/oss-security/2019/07/06/3

ADVISORYhttp://www.openwall.com/lists/oss-security/2019/07/06/4

ADVISORYhttp://www.securityfocus.com/bid/108818

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:1594

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:1602

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:1699

ADVISORYhttps://access.redhat.com/security/vulnerabilities/tcpsack

ADVISORYhttps://cert-portal.siemens.com/productcert/pdf/ssa-462066.pdf

ADVISORYhttps://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44193

ADVISORYhttps://kc.mcafee.com/corporate/index?page=content&id=SB10287

ADVISORYhttps://psirt.global.sonicwall.com/vuln-detail/SNWLID-2019-0008

ADVISORYhttps://security.netapp.com/advisory/ntap-20190625-0001/

ADVISORYhttps://support.f5.com/csp/article/K35421172

ADVISORYhttps://usn.ubuntu.com/4041-1/

ADVISORYhttps://usn.ubuntu.com/4041-2/

ADVISORYhttps://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SACKPanic

ADVISORYhttps://www.kb.cert.org/vuls/id/905115

ADVISORYhttps://www.oracle.com/security-alerts/cpujan2020.html

ADVISORYhttps://www.synology.com/security/advisory/Synology_SA_19_28

ADVISORYhttps://www.us-cert.gov/ics/advisories/icsa-19-253-03

ADVISORYhttps://www.us-cert.gov/ics/advisories/icsma-20-170-06

ADVISORYhttp://www.arubanetworks.com/assets/alert/ARUBA-PSA-2020-010.txt

ADVISORYhttp://www.openwall.com/lists/oss-security/2019/06/28/2

ADVISORYhttp://www.openwall.com/lists/oss-security/2019/07/06/3

ADVISORYhttp://www.openwall.com/lists/oss-security/2019/07/06/4

ADVISORYhttp://www.securityfocus.com/bid/108818

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:1594

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:1602

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:1699

ADVISORYhttps://access.redhat.com/security/vulnerabilities/tcpsack

ADVISORYhttps://cert-portal.siemens.com/productcert/pdf/ssa-462066.pdf

ADVISORYhttps://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44193

ADVISORYhttps://kc.mcafee.com/corporate/index?page=content&id=SB10287

ADVISORYhttps://psirt.global.sonicwall.com/vuln-detail/SNWLID-2019-0008

ADVISORYhttps://security.netapp.com/advisory/ntap-20190625-0001/

ADVISORYhttps://support.f5.com/csp/article/K35421172

ADVISORYhttps://usn.ubuntu.com/4041-1/

ADVISORYhttps://usn.ubuntu.com/4041-2/

ADVISORYhttps://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SACKPanic

ADVISORYhttps://www.kb.cert.org/vuls/id/905115

ADVISORYhttps://www.oracle.com/security-alerts/cpujan2020.html

ADVISORYhttps://www.synology.com/security/advisory/Synology_SA_19_28

ADVISORYhttps://www.us-cert.gov/ics/advisories/icsa-19-253-03

ADVISORYhttps://www.us-cert.gov/ics/advisories/icsma-20-170-06

All References (56)

→

http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2020-010.txtThird Party Advisory

→

http://www.openwall.com/lists/oss-security/2019/06/28/2Mailing List · Third Party Advisory

→

http://www.openwall.com/lists/oss-security/2019/07/06/3Mailing List · Third Party Advisory

→

http://www.openwall.com/lists/oss-security/2019/07/06/4Mailing List · Third Party Advisory

→

http://www.securityfocus.com/bid/108818Third Party Advisory · VDB Entry

→

https://access.redhat.com/errata/RHSA-2019:1594Third Party Advisory

→

https://access.redhat.com/errata/RHSA-2019:1602Third Party Advisory

→

https://access.redhat.com/errata/RHSA-2019:1699Third Party Advisory

→

https://access.redhat.com/security/vulnerabilities/tcpsackThird Party Advisory

→

https://cert-portal.siemens.com/productcert/pdf/ssa-462066.pdfThird Party Advisory

→

https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=5f3e2bf008c2221478101ee72f5cb4654b9fc363Mailing List · Patch · Vendor Advisory

→

https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=967c05aee439e6e5d7d805e195b3a20ef5c433d6Mailing List · Patch · Vendor Advisory

→

https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-001.mdPatch · Third Party Advisory

→

https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44193Third Party Advisory

→

https://kc.mcafee.com/corporate/index?page=content&id=SB10287Third Party Advisory

Quick Facts

CVE IDCVE-2019-11479

CVSS Score7.5 / 10

SeverityHIGH

WeaknessCWE-405

CISA KEVNo

Affected4 vendor(s)

PublishedJun 19, 2019

Related CVEs (CWE-405)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2019-11479 in threat intel feeds
→Review IDS/IPS signatures for exploitation attempts

Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.

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