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Vulnerability Details : CVE-2019-6477

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).
Publish Date : 2019-11-26 Last Update Date : 2020-10-20
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- CVSS Scores & Vulnerability Types

CVSS Score
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact None (There is no impact to the integrity of the system)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s)
CWE ID 400

- Related OVAL Definitions

Title Definition Id Class Family
RHSA-2020:1061: bind security and bug fix update (Moderate) oval:com.redhat.rhsa:def:20201061 unix
RHSA-2020:1845: bind security, bug fix, and enhancement update (Moderate) oval:com.redhat.rhsa:def:20201845 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2019-6477

# Product Type Vendor Product Version Update Edition Language
1 OS Fedoraproject Fedora 30 * * * Version Details Vulnerabilities
2 OS Fedoraproject Fedora 31 * * * Version Details Vulnerabilities
3 Application ISC Bind * * * * Version Details Vulnerabilities
4 Application ISC Bind 9.11.5 S6 * * Version Details Vulnerabilities
5 Application ISC Bind 9.11.6 P1 * * Version Details Vulnerabilities
6 Application ISC Bind 9.11.6 RC1 * * Version Details Vulnerabilities
7 Application ISC Bind 9.11.12 S1 * * Version Details Vulnerabilities
8 Application ISC Bind 9.12.4 P1 * * Version Details Vulnerabilities
9 Application ISC Bind 9.12.4 P2 * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Fedoraproject Fedora 2
ISC Bind 7

- References For CVE-2019-6477
SUSE openSUSE-SU-2020:1699
DEBIAN DSA-4689 CONFIRM[email protected]/message/L3DEMNZMKR57VQJCG5ZN55ZGTQRL2TFQ/
FEDORA FEDORA-2019-c703d2304a CONFIRM[email protected]/message/XGURMGQHX45KR4QDRCSUQHODUFOGNGAN/
SUSE openSUSE-SU-2020:1701

- Metasploit Modules Related To CVE-2019-6477

There are not any metasploit modules related to this CVE entry (Please visit for more information)

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