HOME VULNERABILITIESCVE-2019-11477

HIGH

CVE-2019-11477

CWE-190Published: June 19, 2019· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official 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.

Technical Analysis

CVE-2019-11477 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

f514 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+2

ivanti1 product(s)

connect secure

Linux1 product(s)

linux kernel

pulsesecure2 product(s)

pulse policy securepulse secure virtual application delivery controller

Red Hat5 product(s)

enterprise linux atomic hostenterprise linuxenterprise linux ausenterprise linux eusenterprise mrg

Source: NVD CPE · 47 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=3b4929f65b0d8249f19a50245cd88ed1a2f78cff

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=3b4929f65b0d8249f19a50245cd88ed1a2f78cff

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

ADVISORYhttp://packetstormsecurity.com/files/153346/Kernel-Live-Patch-Security-Notice-LSN-0052-1.html

ADVISORYhttp://packetstormsecurity.com/files/154951/Kernel-Live-Patch-Security-Notice-LSN-0058-1.html

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

ADVISORYhttp://www.huawei.com/en/psirt/security-advisories/huawei-sa-20191225-01-kernel-en

ADVISORYhttp://www.openwall.com/lists/oss-security/2019/06/20/3

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.openwall.com/lists/oss-security/2019/10/24/1

ADVISORYhttp://www.openwall.com/lists/oss-security/2019/10/29/3

ADVISORYhttp://www.vmware.com/security/advisories/VMSA-2019-0010.html

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-2019-0006

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

ADVISORYhttps://support.f5.com/csp/article/K78234183

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.oracle.com/security-alerts/cpuoct2020.html

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

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

ADVISORYhttp://packetstormsecurity.com/files/153346/Kernel-Live-Patch-Security-Notice-LSN-0052-1.html

ADVISORYhttp://packetstormsecurity.com/files/154951/Kernel-Live-Patch-Security-Notice-LSN-0058-1.html

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

ADVISORYhttp://www.huawei.com/en/psirt/security-advisories/huawei-sa-20191225-01-kernel-en

ADVISORYhttp://www.openwall.com/lists/oss-security/2019/06/20/3

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.openwall.com/lists/oss-security/2019/10/24/1

ADVISORYhttp://www.openwall.com/lists/oss-security/2019/10/29/3

ADVISORYhttp://www.vmware.com/security/advisories/VMSA-2019-0010.html

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-2019-0006

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

ADVISORYhttps://support.f5.com/csp/article/K78234183

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.oracle.com/security-alerts/cpuoct2020.html

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

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

All References (58)

→

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

Quick Facts

CVE IDCVE-2019-11477

CVSS Score7.5 / 10

SeverityHIGH

WeaknessCWE-190

CISA KEVNo

Affected6 vendor(s)

PublishedJun 19, 2019

Related CVEs (CWE-190)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2019-11477 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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