7.5
HIGH
CVE-2019-6477
Apache Server TCP Pipelining Resource Exhaustion Vulnerability
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).

INFO

Published Date :

Nov. 26, 2019, 4:15 p.m.

Last Modified :

Nov. 7, 2023, 3:13 a.m.

Source :

[email protected]

Remotely Exploitable :

Yes !

Impact Score :

3.6

Exploitability Score :

3.9
Public PoC/Exploit Available at Github

CVE-2019-6477 has a 7 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

Affected Products

The following products are affected by CVE-2019-6477 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Fedoraproject fedora
1 Isc bind
: Total Affected Vendor : 2 | Products : 2
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2019-6477.

URL Resource
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.html
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.html
https://kb.isc.org/docs/cve-2019-6477 Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3DEMNZMKR57VQJCG5ZN55ZGTQRL2TFQ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XGURMGQHX45KR4QDRCSUQHODUFOGNGAN/
https://support.f5.com/csp/article/K15840535?utm_source=f5support&amp%3Butm_medium=RSS
https://www.debian.org/security/2020/dsa-4689
https://www.synology.com/security/advisory/Synology_SA_19_39 Third Party Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Profile Photo
psmedley/bind-os2

None

Emacs Lisp Makefile C Shell Roff HTML C++ XSLT Perl Python

Updated: 4 months, 2 weeks ago
0 stars 0 fork 0 watcher
Born at : July 6, 2024, 9:22 a.m. This repo has been linked 35 different CVEs too.
Profile Photo
fokypoky/places-list

None

asp-net-core csharp docker dockerfile javascript react webapi docker-compose

C# Dockerfile HTML JavaScript CSS

Updated: 7 months, 2 weeks ago
0 stars 0 fork 0 watcher
Born at : Feb. 22, 2024, 6:42 p.m. This repo has been linked 383 different CVEs too.
Profile Photo
balabit-deps/balabit-os-9-bind9-libs

None

Emacs Lisp Makefile C Shell Roff HTML C++ XSLT Perl Python

Updated: 2 years ago
0 stars 0 fork 0 watcher
Born at : Nov. 15, 2022, 10:19 a.m. This repo has been linked 25 different CVEs too.
Profile Photo
balabit-deps/balabit-os-8-bind9-libs

None

Emacs Lisp Makefile C Shell Roff HTML C++ XSLT Perl Python

Updated: 2 years ago
0 stars 0 fork 0 watcher
Born at : Nov. 11, 2022, 1:15 p.m. This repo has been linked 23 different CVEs too.
Profile Photo
vincent-deng/veracode-container-security-finding-parser

Map Vulnerabilities into Different Layers of the Container Image

Python

Updated: 1 year, 10 months ago
1 stars 0 fork 0 watcher
Born at : Oct. 5, 2022, 12:07 p.m. This repo has been linked 1276 different CVEs too.
Profile Photo
pexip/os-bind9-libs

Packaging for bind9-libs

Emacs Lisp Makefile C Shell Roff HTML C++ XSLT Perl Python

Updated: 6 months ago
0 stars 0 fork 0 watcher
Born at : June 21, 2022, 1:57 p.m. This repo has been linked 25 different CVEs too.
Profile Photo
bg6cq/bind9

bind9.14 mirror

Makefile Shell C Roff HTML C++ XSLT Perl Python Batchfile

Updated: 4 years, 11 months ago
0 stars 0 fork 0 watcher
Born at : Dec. 21, 2019, 7:42 a.m. This repo has been linked 6 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2019-6477 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2019-6477 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Nov. 07, 2023

    Action Type Old Value New Value
    Added Reference Internet Systems Consortium (ISC) https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XGURMGQHX45KR4QDRCSUQHODUFOGNGAN/ [No types assigned]
    Added Reference Internet Systems Consortium (ISC) https://support.f5.com/csp/article/K15840535?utm_source=f5support&amp%3Butm_medium=RSS [No types assigned]
    Added Reference Internet Systems Consortium (ISC) https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3DEMNZMKR57VQJCG5ZN55ZGTQRL2TFQ/ [No types assigned]
    Removed Reference Internet Systems Consortium (ISC) https://lists.fedoraproject.org/archives/list/[email protected]/message/XGURMGQHX45KR4QDRCSUQHODUFOGNGAN/
    Removed Reference Internet Systems Consortium (ISC) https://support.f5.com/csp/article/K15840535?utm_source=f5support&utm_medium=RSS
    Removed Reference Internet Systems Consortium (ISC) https://lists.fedoraproject.org/archives/list/[email protected]/message/L3DEMNZMKR57VQJCG5ZN55ZGTQRL2TFQ/
  • CVE Modified by [email protected]

    Oct. 20, 2020

    Action Type Old Value New Value
    Added Reference http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.html [No Types Assigned]
  • CVE Modified by [email protected]

    Oct. 20, 2020

    Action Type Old Value New Value
    Added Reference http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.html [No Types Assigned]
  • CVE Modified by [email protected]

    May. 20, 2020

    Action Type Old Value New Value
    Added Reference https://www.debian.org/security/2020/dsa-4689 [No Types Assigned]
  • Initial Analysis by [email protected]

    Dec. 18, 2019

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:N/I:N/A:P)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    Changed Reference Type https://kb.isc.org/docs/cve-2019-6477 No Types Assigned https://kb.isc.org/docs/cve-2019-6477 Third Party Advisory
    Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/L3DEMNZMKR57VQJCG5ZN55ZGTQRL2TFQ/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/L3DEMNZMKR57VQJCG5ZN55ZGTQRL2TFQ/ Third Party Advisory
    Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/XGURMGQHX45KR4QDRCSUQHODUFOGNGAN/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/XGURMGQHX45KR4QDRCSUQHODUFOGNGAN/ Third Party Advisory
    Changed Reference Type https://support.f5.com/csp/article/K15840535?utm_source=f5support&utm_medium=RSS No Types Assigned https://support.f5.com/csp/article/K15840535?utm_source=f5support&utm_medium=RSS Third Party Advisory
    Changed Reference Type https://www.synology.com/security/advisory/Synology_SA_19_39 No Types Assigned https://www.synology.com/security/advisory/Synology_SA_19_39 Third Party Advisory
    Added CWE NIST CWE-400
    Added CPE Configuration OR *cpe:2.3:a:isc:bind:9.11.5:s6:*:*:supported_preview:*:*:* *cpe:2.3:a:isc:bind:9.11.6:p1:*:*:*:*:*:* *cpe:2.3:a:isc:bind:9.11.6:rc1:*:*:*:*:*:* *cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:* versions from (including) 9.11.7 up to (including) 9.11.12 *cpe:2.3:a:isc:bind:9.11.12:s1:*:*:supported_preview:*:*:* *cpe:2.3:a:isc:bind:9.12.4:p1:*:*:*:*:*:* *cpe:2.3:a:isc:bind:9.12.4:p2:*:*:*:*:*:* *cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:* versions from (including) 9.14.1 up to (including) 9.14.7 *cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:* versions from (including) 9.15.0 up to (including) 9.15.5
    Added CPE Configuration OR *cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Dec. 18, 2019

    Action Type Old Value New Value
    Added Reference https://www.synology.com/security/advisory/Synology_SA_19_39 [No Types Assigned]
  • CVE Modified by [email protected]

    Dec. 13, 2019

    Action Type Old Value New Value
    Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/L3DEMNZMKR57VQJCG5ZN55ZGTQRL2TFQ/ [No Types Assigned]
  • CVE Modified by [email protected]

    Dec. 03, 2019

    Action Type Old Value New Value
    Added Reference https://support.f5.com/csp/article/K15840535?utm_source=f5support&utm_medium=RSS [No Types Assigned]
  • CVE Modified by [email protected]

    Nov. 29, 2019

    Action Type Old Value New Value
    Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/XGURMGQHX45KR4QDRCSUQHODUFOGNGAN/ [No Types Assigned]
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2019-6477 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2019-6477 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

2.76 }} 1.05%

score

0.90899

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
: