CVE-2019-11477

Name: CVE-2019-11477
Creator: NVD / NIST
Published: 2019-06-19T00:15:12.64+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 98.75%

Last modified Jun 17, 2026

CVE-2019-11477 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Jonathan Looney discovered that the TCP_SKB_CB(skb)->tcp_gso_segs value was subject to an integer overflow in the Linux kernel when handling TCP Selective Acknowledgments (SACKs). A remote attacker could use this to cause a denial of service. EPSS estimates a 98.75% chance of exploitation in the next 30 days.

Description

Jonathan Looney discovered that the TCP_SKB_CB(skb)->tcp_gso_segs value was subject to an integer overflow in the Linux kernel when handling TCP Selective Acknowledgments (SACKs). 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 3b4929f65b0d8249f19a50245cd88ed1a2f78cff.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

98.75%

99.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	>= 2.6.29, < 3.16.69
Linux	Linux Kernel	>= 3.17, < 4.4.182
Linux	Linux Kernel	>= 4.5, < 4.9.182
Linux	Linux Kernel	>= 4.10, < 4.14.127
Linux	Linux Kernel	>= 4.15, < 4.19.52
Linux	Linux Kernel	>= 4.20, < 5.1.11
F5	Big-Ip Advanced Firewall Manager	>= 11.5.2, <= 11.6.4
F5	Big-Ip Advanced Firewall Manager	>= 12.1.0, <= 12.1.4
F5	Big-Ip Advanced Firewall Manager	>= 13.1.0, <= 13.1.1
F5	Big-Ip Advanced Firewall Manager	>= 14.0.0, <= 14.1.0
F5	Big-Ip Advanced Firewall Manager	15.0.0
F5	Big-Ip Access Policy Manager	>= 11.5.2, <= 11.6.4
F5	Big-Ip Access Policy Manager	>= 12.1.0, <= 12.1.4
F5	Big-Ip Access Policy Manager	>= 13.1.0, <= 13.1.1
F5	Big-Ip Access Policy Manager	>= 14.0.0, <= 14.1.0
F5	Big-Ip Access Policy Manager	15.0.0
F5	Big-Ip Application Acceleration Manager	>= 11.5.2, <= 11.6.4
F5	Big-Ip Application Acceleration Manager	>= 12.1.0, <= 12.1.4
F5	Big-Ip Application Acceleration Manager	>= 13.1.0, <= 13.1.1
F5	Big-Ip Application Acceleration Manager	>= 14.0.0, <= 14.1.0
F5	Big-Ip Application Acceleration Manager	15.0.0
F5	Big-Ip Link Controller	>= 11.5.2, <= 11.6.4
F5	Big-Ip Link Controller	>= 12.1.0, <= 12.1.4
F5	Big-Ip Link Controller	>= 13.1.0, <= 13.1.1
F5	Big-Ip Link Controller	>= 14.0.0, <= 14.1.0
F5	Big-Ip Link Controller	15.0.0
F5	Big-Ip Policy Enforcement Manager	>= 11.5.2, <= 11.6.4
F5	Big-Ip Policy Enforcement Manager	>= 12.1.0, <= 12.1.4
F5	Big-Ip Policy Enforcement Manager	>= 13.1.0, <= 13.1.1
F5	Big-Ip Policy Enforcement Manager	>= 14.0.0, <= 14.1.0
F5	Big-Ip Policy Enforcement Manager	15.0.0
F5	Big-Ip Webaccelerator	>= 11.5.2, <= 11.6.4
F5	Big-Ip Webaccelerator	>= 12.1.0, <= 12.1.4
F5	Big-Ip Webaccelerator	>= 13.1.0, <= 13.1.1
F5	Big-Ip Webaccelerator	>= 14.0.0, <= 14.1.0
F5	Big-Ip Webaccelerator	15.0.0
F5	Big-Ip Application Security Manager	>= 11.5.2, <= 11.6.4
F5	Big-Ip Application Security Manager	>= 12.1.0, <= 12.1.4
F5	Big-Ip Application Security Manager	>= 13.1.0, <= 13.1.1
F5	Big-Ip Application Security Manager	>= 14.0.0, <= 14.1.0
F5	Big-Ip Application Security Manager	15.0.0
F5	Big-Ip Local Traffic Manager	>= 11.5.2, <= 11.6.4
F5	Big-Ip Local Traffic Manager	>= 12.1.0, <= 12.1.4
F5	Big-Ip Local Traffic Manager	>= 13.1.0, <= 13.1.1
F5	Big-Ip Local Traffic Manager	>= 14.0.0, <= 14.1.0
F5	Big-Ip Local Traffic Manager	15.0.0
F5	Big-Ip Fraud Protection Service	>= 11.5.2, <= 11.6.4
F5	Big-Ip Fraud Protection Service	>= 12.1.0, <= 12.1.4
F5	Big-Ip Fraud Protection Service	>= 13.1.0, <= 13.1.1
F5	Big-Ip Fraud Protection Service	>= 14.0.0, <= 14.1.0

Showing 50 of 91 affected configurations. See NVD for the full list.

References

http://packetstormsecurity.com/files/153346/Kernel-Live-Patch-Security-Notice-LSN-0052-1.htmlThird Party Advisory, VDB Entry
http://packetstormsecurity.com/files/154951/Kernel-Live-Patch-Security-Notice-LSN-0058-1.htmlThird Party Advisory, VDB Entry
http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2020-010.txtThird Party Advisory
http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20191225-01-kernel-enThird Party Advisory
http://www.openwall.com/lists/oss-security/2019/06/20/3Mailing List, Third 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.openwall.com/lists/oss-security/2019/10/24/1Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2019/10/29/3Mailing List, Third Party Advisory
http://www.vmware.com/security/advisories/VMSA-2019-0010.htmlThird Party Advisory
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=3b4929f65b0d8249f19a50245cd88ed1a2f78cffMailing 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
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2019-0006Third Party Advisory
https://security.netapp.com/advisory/ntap-20190625-0001/Third Party Advisory
https://support.f5.com/csp/article/K78234183Third Party Advisory
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SACKPanicMitigation, Third Party Advisory
https://www.kb.cert.org/vuls/id/905115Third Party Advisory, US Government Resource
https://www.oracle.com/security-alerts/cpujan2020.htmlThird Party Advisory
https://www.oracle.com/security-alerts/cpuoct2020.htmlThird Party Advisory
https://www.synology.com/security/advisory/Synology_SA_19_28Third Party Advisory
https://www.us-cert.gov/ics/advisories/icsa-19-253-03Third Party Advisory, US Government Resource
http://packetstormsecurity.com/files/153346/Kernel-Live-Patch-Security-Notice-LSN-0052-1.htmlThird Party Advisory, VDB Entry
http://packetstormsecurity.com/files/154951/Kernel-Live-Patch-Security-Notice-LSN-0058-1.htmlThird Party Advisory, VDB Entry
http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2020-010.txtThird Party Advisory
http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20191225-01-kernel-enThird Party Advisory
http://www.openwall.com/lists/oss-security/2019/06/20/3Mailing List, Third 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.openwall.com/lists/oss-security/2019/10/24/1Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2019/10/29/3Mailing List, Third Party Advisory
http://www.vmware.com/security/advisories/VMSA-2019-0010.htmlThird Party Advisory
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=3b4929f65b0d8249f19a50245cd88ed1a2f78cffMailing 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
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2019-0006Third Party Advisory
https://security.netapp.com/advisory/ntap-20190625-0001/Third Party Advisory
https://support.f5.com/csp/article/K78234183Third Party Advisory
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SACKPanicMitigation, Third Party Advisory
https://www.kb.cert.org/vuls/id/905115Third Party Advisory, US Government Resource
https://www.oracle.com/security-alerts/cpujan2020.htmlThird Party Advisory
https://www.oracle.com/security-alerts/cpuoct2020.htmlThird Party Advisory
https://www.synology.com/security/advisory/Synology_SA_19_28Third Party Advisory
https://www.us-cert.gov/ics/advisories/icsa-19-253-03Third Party Advisory, US Government Resource

Timeline

Published: Jun 19, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-11477?

How severe is CVE-2019-11477?

CVE-2019-11477 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 98.75% probability of exploitation in the next 30 days.

How do I fix CVE-2019-11477?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-11477?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST