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CVE-2019-6477

7.5 · HIGH

With pipelining enabled each incoming query on a TCP connection requires a similar resource allocation to a query received via UDP or via TCP without pipelining enabled.

Published Nov 26, 2019CWE-400EPSS 4.06%

Overview

CVE-2019-6477 is a high-severity vulnerability. It was published on November 26, 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

With pipelining enabled each incoming query on a TCP connection requires a similar resource allocation to a query received via UDP or via TCP without pipelining enabled. A client using a TCP-pipelined connection to a server could consume more resources than the server has been provisioned to handle. When a TCP connection with a large number of pipelined queries is closed, the load on the server releasing these multiple resources can cause it to become unresponsive, even for queries that can be answered authoritatively or from cache. (This is most likely to be perceived as an intermittent server problem).

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

Reflists.opensuse.org/opensuse-security-announce/2020-10/msg00041.htmlReflists.opensuse.org/opensuse-security-announce/2020-10/msg00044.htmlRefkb.isc.org/docs/cve-2019-6477Reflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3DEMNZMKR57VQJCG5ZN55ZGTQRL2TFQ/Reflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XGURMGQHX45KR4QDRCSUQHODUFOGNGAN/Refsupport.f5.com/csp/article/K15840535?utm_source=f5support&amp%3Butm_medium=RSSRefwww.debian.org/security/2020/dsa-4689Refwww.synology.com/security/advisory/Synology_SA_19_39Reflists.opensuse.org/opensuse-security-announce/2020-10/msg00041.htmlReflists.opensuse.org/opensuse-security-announce/2020-10/msg00044.html

How CyberStrike helps

Frequently asked questions

What is CVE-2019-6477?

CVE-2019-6477 is a high-severity vulnerability. It was published on November 26, 2019 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2019-6477?

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-2019-6477?

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-2019-6477?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-6477 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.

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