Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2019-11479

7.5 · HIGH

Jonathan Looney discovered that the Linux kernel default MSS is hard-coded to 48 bytes.

Published Jun 19, 2019CWE-405EPSS 91.66%

Overview

CVE-2019-11479 is a high-severity vulnerability. It was published on June 19, 2019 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refwww.arubanetworks.com/assets/alert/ARUBA-PSA-2020-010.txtRefwww.openwall.com/lists/oss-security/2019/06/28/2Refwww.openwall.com/lists/oss-security/2019/07/06/3Refwww.openwall.com/lists/oss-security/2019/07/06/4Refwww.securityfocus.com/bid/108818Refaccess.redhat.com/errata/RHSA-2019:1594Refaccess.redhat.com/errata/RHSA-2019:1602Refaccess.redhat.com/errata/RHSA-2019:1699Refaccess.redhat.com/security/vulnerabilities/tcpsackRefcert-portal.siemens.com/productcert/pdf/ssa-462066.pdf

How CyberStrike helps

Frequently asked questions

What is CVE-2019-11479?

CVE-2019-11479 is a high-severity vulnerability. It was published on June 19, 2019 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2019-11479?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2019-11479?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2019-11479?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-11479 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

Related HIGH CVEs from 2019

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999