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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.

Security Impact Summary

This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 7.5, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts and availability (service disruption) for affected systems. Impacting 21 products from linux, from f5, from f5 and 18 others, organizations running these solutions should prioritize assessment and patching.

Historical Context

First disclosed in 2019, this vulnerability was reported during a period defined by widespread IoT adoption challenges, mobile security concerns, and the emergence of advanced persistent threat (APT) techniques. Contemporary mitigation strategies focused on secure development practices and third-party component vetting.

Published

2019-06-19T00:15:12.767

Last Modified

2024-11-21T04:21:09.880

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 7.5 (HIGH)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:N/A:P

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: PARTIAL

Exploitability Score

10.0

Impact Score

2.9

Weaknesses

Type: Secondary
CWE-405
Type: Primary
CWE-770

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	linux	linux_kernel	< 4.4.182	Yes
Operating System	linux	linux_kernel	< 4.9.182	Yes
Operating System	linux	linux_kernel	< 4.14.127	Yes
Operating System	linux	linux_kernel	< 4.19.52	Yes
Operating System	linux	linux_kernel	< 5.1.11	Yes
Application	f5	big-ip_advanced_firewall_manager	< 11.6.5.1	Yes
Application	f5	big-ip_advanced_firewall_manager	< 12.1.5.1	Yes
Application	f5	big-ip_advanced_firewall_manager	< 13.1.3.2	Yes
Application	f5	big-ip_advanced_firewall_manager	< 14.0.1.1	Yes
Application	f5	big-ip_advanced_firewall_manager	< 14.1.2.1	Yes
Application	f5	big-ip_advanced_firewall_manager	< 15.0.1.1	Yes
Application	f5	big-ip_access_policy_manager	< 11.6.5.1	Yes
Application	f5	big-ip_access_policy_manager	< 12.1.5.1	Yes
Application	f5	big-ip_access_policy_manager	< 13.1.3.2	Yes
Application	f5	big-ip_access_policy_manager	< 14.0.1.1	Yes
Application	f5	big-ip_access_policy_manager	< 14.1.2.1	Yes
Application	f5	big-ip_access_policy_manager	< 15.0.1.1	Yes
Application	f5	big-ip_application_acceleration_manager	< 11.6.5.1	Yes
Application	f5	big-ip_application_acceleration_manager	< 12.1.5.1	Yes
Application	f5	big-ip_application_acceleration_manager	< 13.1.3.2	Yes
Application	f5	big-ip_application_acceleration_manager	< 14.0.1.1	Yes
Application	f5	big-ip_application_acceleration_manager	< 14.1.2.1	Yes
Application	f5	big-ip_application_acceleration_manager	< 15.0.1.1	Yes
Application	f5	big-ip_link_controller	< 11.6.5.1	Yes
Application	f5	big-ip_link_controller	< 12.1.5.1	Yes
Application	f5	big-ip_link_controller	< 13.1.3.2	Yes
Application	f5	big-ip_link_controller	< 14.0.1.1	Yes
Application	f5	big-ip_link_controller	< 14.1.2.1	Yes
Application	f5	big-ip_link_controller	< 15.0.1.1	Yes
Application	f5	big-ip_policy_enforcement_manager	< 11.6.5.1	Yes
Application	f5	big-ip_policy_enforcement_manager	< 12.1.5.1	Yes
Application	f5	big-ip_policy_enforcement_manager	< 13.1.3.2	Yes
Application	f5	big-ip_policy_enforcement_manager	< 14.0.1.1	Yes
Application	f5	big-ip_policy_enforcement_manager	< 14.1.2.1	Yes
Application	f5	big-ip_policy_enforcement_manager	< 15.0.1.1	Yes
Application	f5	big-ip_webaccelerator	< 11.6.5.1	Yes
Application	f5	big-ip_webaccelerator	< 12.1.5.1	Yes
Application	f5	big-ip_webaccelerator	< 13.1.3.2	Yes
Application	f5	big-ip_webaccelerator	< 14.0.1.1	Yes
Application	f5	big-ip_webaccelerator	< 14.1.2.1	Yes
Application	f5	big-ip_webaccelerator	< 15.0.1.1	Yes
Application	f5	big-ip_application_security_manager	< 11.6.5.1	Yes
Application	f5	big-ip_application_security_manager	< 12.1.5.1	Yes
Application	f5	big-ip_application_security_manager	< 13.1.3.2	Yes
Application	f5	big-ip_application_security_manager	< 14.0.1.1	Yes
Application	f5	big-ip_application_security_manager	< 14.1.2.1	Yes
Application	f5	big-ip_application_security_manager	< 15.0.1.1	Yes
Application	f5	big-ip_local_traffic_manager	< 11.6.5.1	Yes
Application	f5	big-ip_local_traffic_manager	< 12.1.5.1	Yes
Application	f5	big-ip_local_traffic_manager	< 13.1.3.2	Yes
Application	f5	big-ip_local_traffic_manager	< 14.0.1.1	Yes
Application	f5	big-ip_local_traffic_manager	< 14.1.2.1	Yes
Application	f5	big-ip_local_traffic_manager	< 15.0.1.1	Yes
Application	f5	big-ip_fraud_protection_service	< 11.6.5.1	Yes
Application	f5	big-ip_fraud_protection_service	< 12.1.5.1	Yes
Application	f5	big-ip_fraud_protection_service	< 13.1.3.2	Yes
Application	f5	big-ip_fraud_protection_service	< 14.0.1.1	Yes
Application	f5	big-ip_fraud_protection_service	< 14.1.2.1	Yes
Application	f5	big-ip_fraud_protection_service	< 15.0.1.1	Yes
Application	f5	big-ip_global_traffic_manager	< 11.6.5.1	Yes
Application	f5	big-ip_global_traffic_manager	< 12.1.5.1	Yes
Application	f5	big-ip_global_traffic_manager	< 13.1.3.2	Yes
Application	f5	big-ip_global_traffic_manager	< 14.0.1.1	Yes
Application	f5	big-ip_global_traffic_manager	< 14.1.2.1	Yes
Application	f5	big-ip_global_traffic_manager	< 15.0.1.1	Yes
Application	f5	big-ip_analytics	< 11.6.5.1	Yes
Application	f5	big-ip_analytics	< 12.1.5.1	Yes
Application	f5	big-ip_analytics	< 13.1.3.2	Yes
Application	f5	big-ip_analytics	< 14.0.1.1	Yes
Application	f5	big-ip_analytics	< 14.1.2.1	Yes
Application	f5	big-ip_analytics	< 15.0.1.1	Yes
Application	f5	big-ip_edge_gateway	< 11.6.5.1	Yes
Application	f5	big-ip_edge_gateway	< 12.1.5.1	Yes
Application	f5	big-ip_edge_gateway	< 13.1.3.2	Yes
Application	f5	big-ip_edge_gateway	< 14.0.1.1	Yes
Application	f5	big-ip_edge_gateway	< 14.1.2.1	Yes
Application	f5	big-ip_edge_gateway	< 15.0.1.1	Yes
Application	f5	big-ip_domain_name_system	< 11.6.5.1	Yes
Application	f5	big-ip_domain_name_system	< 12.1.5.1	Yes
Application	f5	big-ip_domain_name_system	< 13.1.3.2	Yes
Application	f5	big-ip_domain_name_system	< 14.0.1.1	Yes
Application	f5	big-ip_domain_name_system	< 14.1.2.1	Yes
Application	f5	big-ip_domain_name_system	< 15.0.1.1	Yes
Operating System	canonical	ubuntu_linux	14.04	Yes
Operating System	canonical	ubuntu_linux	16.04	Yes
Operating System	canonical	ubuntu_linux	18.04	Yes
Operating System	canonical	ubuntu_linux	18.10	Yes
Operating System	canonical	ubuntu_linux	19.04	Yes
Operating System	redhat	enterprise_linux	7.0	Yes
Application	f5	big-iq_centralized_management	≤ 5.4.0	Yes
Application	f5	big-iq_centralized_management	≤ 6.1.0	Yes
Application	f5	enterprise_manager	3.1.1	Yes
Application	f5	iworkflow	2.3.0	Yes
Application	f5	traffix_signaling_delivery_controller	≤ 5.1.0	Yes
Application	redhat	virtualization_host	4.0	Yes
Operating System	redhat	enterprise_linux	7.0	No

References

http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2020-010.txt Third Party Advisory ([email protected])
http://www.openwall.com/lists/oss-security/2019/06/28/2 Mailing List, Third Party Advisory ([email protected])
http://www.openwall.com/lists/oss-security/2019/07/06/3 Mailing List, Third Party Advisory ([email protected])
http://www.openwall.com/lists/oss-security/2019/07/06/4 Mailing List, Third Party Advisory ([email protected])
http://www.securityfocus.com/bid/108818 Third Party Advisory, VDB Entry ([email protected])
https://access.redhat.com/errata/RHSA-2019:1594 Third Party Advisory ([email protected])
https://access.redhat.com/errata/RHSA-2019:1602 Third Party Advisory ([email protected])
https://access.redhat.com/errata/RHSA-2019:1699 Third Party Advisory ([email protected])
https://access.redhat.com/security/vulnerabilities/tcpsack Third Party Advisory ([email protected])
https://cert-portal.siemens.com/productcert/pdf/ssa-462066.pdf Third Party Advisory ([email protected])
https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=5f3e2bf008c2221478101ee72f5cb4654b9fc363 Mailing List, Patch, Vendor Advisory ([email protected])
https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=967c05aee439e6e5d7d805e195b3a20ef5c433d6 Mailing List, Patch, Vendor Advisory ([email protected])
https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-001.md Patch, Third Party Advisory ([email protected])
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44193 Third Party Advisory ([email protected])
https://kc.mcafee.com/corporate/index?page=content&id=SB10287 Third Party Advisory ([email protected])
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2019-0008 Third Party Advisory ([email protected])
https://security.netapp.com/advisory/ntap-20190625-0001/ Third Party Advisory ([email protected])
https://support.f5.com/csp/article/K35421172 Third Party Advisory ([email protected])
https://support.f5.com/csp/article/K35421172?utm_source=f5support&amp%3Butm_medium=RSS ([email protected])
https://usn.ubuntu.com/4041-1/ Third Party Advisory ([email protected])
https://usn.ubuntu.com/4041-2/ Third Party Advisory ([email protected])
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SACKPanic Mitigation, Third Party Advisory ([email protected])
https://www.kb.cert.org/vuls/id/905115 Third Party Advisory, US Government Resource ([email protected])
https://www.oracle.com/security-alerts/cpujan2020.html Third Party Advisory ([email protected])
https://www.oracle.com/security-alerts/cpuoct2020.html ([email protected])
https://www.synology.com/security/advisory/Synology_SA_19_28 Third Party Advisory ([email protected])
https://www.us-cert.gov/ics/advisories/icsa-19-253-03 Third Party Advisory, US Government Resource ([email protected])
https://www.us-cert.gov/ics/advisories/icsma-20-170-06 Third Party Advisory, US Government Resource ([email protected])
http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2020-010.txt Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2019/06/28/2 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2019/07/06/3 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2019/07/06/4 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.securityfocus.com/bid/108818 Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
https://access.redhat.com/errata/RHSA-2019:1594 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://access.redhat.com/errata/RHSA-2019:1602 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://access.redhat.com/errata/RHSA-2019:1699 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://access.redhat.com/security/vulnerabilities/tcpsack Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://cert-portal.siemens.com/productcert/pdf/ssa-462066.pdf Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=5f3e2bf008c2221478101ee72f5cb4654b9fc363 Mailing List, Patch, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=967c05aee439e6e5d7d805e195b3a20ef5c433d6 Mailing List, Patch, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-001.md Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44193 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://kc.mcafee.com/corporate/index?page=content&id=SB10287 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2019-0008 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://security.netapp.com/advisory/ntap-20190625-0001/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://support.f5.com/csp/article/K35421172 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://support.f5.com/csp/article/K35421172?utm_source=f5support&amp%3Butm_medium=RSS (af854a3a-2127-422b-91ae-364da2661108)
https://usn.ubuntu.com/4041-1/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://usn.ubuntu.com/4041-2/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SACKPanic Mitigation, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.kb.cert.org/vuls/id/905115 Third Party Advisory, US Government Resource (af854a3a-2127-422b-91ae-364da2661108)
https://www.oracle.com/security-alerts/cpujan2020.html Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.oracle.com/security-alerts/cpuoct2020.html (af854a3a-2127-422b-91ae-364da2661108)
https://www.synology.com/security/advisory/Synology_SA_19_28 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.us-cert.gov/ics/advisories/icsa-19-253-03 Third Party Advisory, US Government Resource (af854a3a-2127-422b-91ae-364da2661108)
https://www.us-cert.gov/ics/advisories/icsma-20-170-06 Third Party Advisory, US Government Resource (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For linux's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.