8.6
HIGH
CVE-2020-8616
Apache HTTP Server Referral Flood DoS/Amplification Vulnerability
Description

A malicious actor who intentionally exploits this lack of effective limitation on the number of fetches performed when processing referrals can, through the use of specially crafted referrals, cause a recursing server to issue a very large number of fetches in an attempt to process the referral. This has at least two potential effects: The performance of the recursing server can potentially be degraded by the additional work required to perform these fetches, and The attacker can exploit this behavior to use the recursing server as a reflector in a reflection attack with a high amplification factor.

INFO

Published Date :

May 19, 2020, 2:15 p.m.

Last Modified :

Nov. 7, 2023, 3:26 a.m.

Source :

[email protected]

Remotely Exploitable :

Yes !

Impact Score :

4.0

Exploitability Score :

3.9
Public PoC/Exploit Available at Github

CVE-2020-8616 has a 11 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-2020-8616 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 Debian debian_linux
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-2020-8616.

URL Resource
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.html
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.html
http://www.nxnsattack.com Exploit Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/05/19/4 Mailing List Patch Third Party Advisory
https://kb.isc.org/docs/cve-2020-8616 Patch Vendor Advisory
https://lists.debian.org/debian-lts-announce/2020/05/msg00031.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JKJXVBOKZ36ER3EUCR7VRB7WGHIIMPNJ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WOGCJS2XQ3SQNF4W6GLZ73LWZJ6ZZWZI/
https://security.netapp.com/advisory/ntap-20200522-0002/
https://usn.ubuntu.com/4365-1/
https://usn.ubuntu.com/4365-2/
https://www.debian.org/security/2020/dsa-4689 Third Party Advisory
https://www.synology.com/security/advisory/Synology_SA_20_12

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: 2 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
smabramov/Vulnerabilities-and-attacks-on-information-systems

None

Updated: 6 months, 2 weeks ago
0 stars 0 fork 0 watcher
Born at : March 10, 2024, 12:15 p.m. This repo has been linked 170 different CVEs too.
Profile Photo
Dokukin1/Metasploitable

None

Updated: 1 year, 1 month ago
0 stars 0 fork 0 watcher
Born at : Aug. 9, 2023, 12:16 p.m. This repo has been linked 170 different CVEs too.
Profile Photo
Iknowmyname/Nmap-Scans-M2

None

Updated: 1 year, 2 months ago
0 stars 0 fork 0 watcher
Born at : June 30, 2023, 4:18 p.m. This repo has been linked 170 different CVEs too.
Profile Photo
NikulinMS/13-01-hw

None

Updated: 1 year, 5 months ago
1 stars 0 fork 0 watcher
Born at : April 10, 2023, 5:46 p.m. This repo has been linked 170 different CVEs too.
Profile Photo
Zhivarev/13-01-hw

Уязвимости и атаки на информационные системы

Updated: 7 months, 2 weeks ago
0 stars 0 fork 0 watcher
Born at : March 24, 2023, 8:20 a.m. This repo has been linked 170 different CVEs too.
Profile Photo
zzzWTF/db-13-01

None

Updated: 1 year, 6 months ago
0 stars 2 fork 2 watcher
Born at : March 12, 2023, 3:01 a.m. This repo has been linked 170 different CVEs too.
Profile Photo
DButter/whitehat_public

None

Updated: 1 year, 7 months ago
0 stars 0 fork 0 watcher
Born at : Feb. 13, 2023, 5:42 p.m. This repo has been linked 173 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: 1 year, 10 months 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
vincent-deng/veracode-container-security-finding-parser

Map Vulnerabilities into Different Layers of the Container Image

Python

Updated: 1 year, 8 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: 4 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.

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

The following list is the news that have been mention CVE-2020-8616 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2020-8616 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/WOGCJS2XQ3SQNF4W6GLZ73LWZJ6ZZWZI/ [No types assigned]
    Added Reference Internet Systems Consortium (ISC) https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JKJXVBOKZ36ER3EUCR7VRB7WGHIIMPNJ/ [No types assigned]
    Removed Reference Internet Systems Consortium (ISC) https://lists.fedoraproject.org/archives/list/[email protected]/message/WOGCJS2XQ3SQNF4W6GLZ73LWZJ6ZZWZI/
    Removed Reference Internet Systems Consortium (ISC) https://lists.fedoraproject.org/archives/list/[email protected]/message/JKJXVBOKZ36ER3EUCR7VRB7WGHIIMPNJ/
  • 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]
  • CPE Deprecation Remap by [email protected]

    Aug. 18, 2020

    Action Type Old Value New Value
    Changed CPE Configuration OR *cpe:2.3:o:debian:debian_linux:10:*:*:*:*:*:*:* OR *cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Jun. 04, 2020

    Action Type Old Value New Value
    Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/JKJXVBOKZ36ER3EUCR7VRB7WGHIIMPNJ/ [No Types Assigned]
  • CVE Modified by [email protected]

    Jun. 01, 2020

    Action Type Old Value New Value
    Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/WOGCJS2XQ3SQNF4W6GLZ73LWZJ6ZZWZI/ [No Types Assigned]
  • CVE Modified by [email protected]

    May. 30, 2020

    Action Type Old Value New Value
    Added Reference https://lists.debian.org/debian-lts-announce/2020/05/msg00031.html [No Types Assigned]
  • CVE Modified by [email protected]

    May. 29, 2020

    Action Type Old Value New Value
    Added Reference https://usn.ubuntu.com/4365-1/ [No Types Assigned]
  • CVE Modified by [email protected]

    May. 28, 2020

    Action Type Old Value New Value
    Added Reference https://www.synology.com/security/advisory/Synology_SA_20_12 [No Types Assigned]
  • CVE Modified by [email protected]

    May. 27, 2020

    Action Type Old Value New Value
    Added Reference https://usn.ubuntu.com/4365-2/ [No Types Assigned]
  • CVE Modified by [email protected]

    May. 22, 2020

    Action Type Old Value New Value
    Added Reference https://security.netapp.com/advisory/ntap-20200522-0002/ [No Types Assigned]
  • Initial Analysis by [email protected]

    May. 21, 2020

    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:C/C:N/I:N/A:H
    Changed Reference Type http://www.nxnsattack.com No Types Assigned http://www.nxnsattack.com Exploit, Third Party Advisory
    Changed Reference Type http://www.openwall.com/lists/oss-security/2020/05/19/4 No Types Assigned http://www.openwall.com/lists/oss-security/2020/05/19/4 Mailing List, Patch, Third Party Advisory
    Changed Reference Type https://kb.isc.org/docs/cve-2020-8616 No Types Assigned https://kb.isc.org/docs/cve-2020-8616 Patch, Vendor Advisory
    Changed Reference Type https://www.debian.org/security/2020/dsa-4689 No Types Assigned https://www.debian.org/security/2020/dsa-4689 Third Party Advisory
    Added CWE NIST CWE-400
    Added CPE Configuration OR *cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:* versions from (including) 9.0.0 up to (including) 9.11.18 *cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:* versions from (including) 9.12.0 up to (including) 9.12.4 *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) 9.13.0 up to (including) 9.13.7 *cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:* versions from (including) 9.14.0 up to (including) 9.14.11 *cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:* versions from (including) 9.15.0 up to (including) 9.15.6 *cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:* versions from (including) 9.16.0 up to (including) 9.16.2 *cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:* versions from (including) 9.17.0 up to (including) 9.17.1
    Added CPE Configuration OR *cpe:2.3:a:isc:bind:9.9.3:s1:*:*:supported_preview:*:*:* *cpe:2.3:a:isc:bind:9.10.5:s1:*:*:supported_preview:*:*:* *cpe:2.3:a:isc:bind:9.10.7:s1:*:*:supported_preview:*:*:* *cpe:2.3:a:isc:bind:9.11.3:s1:*:*:supported_preview:*:*:* *cpe:2.3:a:isc:bind:9.11.5:s3:*:*:supported_preview:*:*:* *cpe:2.3:a:isc:bind:9.11.5:s5:*:*:supported_preview:*:*:* *cpe:2.3:a:isc:bind:9.11.6:s1:*:*:supported_preview:*:*:* *cpe:2.3:a:isc:bind:9.11.7:s1:*:*:supported_preview:*:*:* *cpe:2.3:a:isc:bind:9.11.8:s1:*:*:supported_preview:*:*:*
    Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* *cpe:2.3:o:debian:debian_linux:10:*:*:*:*:*:*:*
  • 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]
  • CVE Modified by [email protected]

    May. 19, 2020

    Action Type Old Value New Value
    Changed Description A malicious actor who intentionally exploits this lack of effective limitation on the number of fetches performed when processing referrals can, through the use of specially crafted referrals, cause a recursing server to issue a very large number of fetches in an attempt to process the referral. This has at least two potential effects: The performance of the recursing server can potentially be degraded by the additional work required to perform these fetches, and The attacker can exploit this behavior to use the recursing server as a reflector in a reflection attack with a high amplification factor. A malicious actor who intentionally exploits this lack of effective limitation on the number of fetches performed when processing referrals can, through the use of specially crafted referrals, cause a recursing server to issue a very large number of fetches in an attempt to process the referral. This has at least two potential effects: The performance of the recursing server can potentially be degraded by the additional work required to perform these fetches, and The attacker can exploit this behavior to use the recursing server as a reflector in a reflection attack with a high amplification factor.
    Added Reference http://www.openwall.com/lists/oss-security/2020/05/19/4 [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-2020-8616 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-2020-8616 weaknesses.

Exploit Prediction

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

1.64 }} -0.70%

score

0.87858

percentile

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