CVE-2019-16021
Cisco BGP EVPN Denial of Service (DoS) Vulnerability
Description
Multiple vulnerabilities in the implementation of Border Gateway Protocol (BGP) Ethernet VPN (EVPN) functionality in Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerabilities are due to incorrect processing of BGP update messages that contain crafted EVPN attributes. An attacker could exploit these vulnerabilities by sending BGP EVPN update messages with malformed attributes to be processed by an affected system. A successful exploit could allow the attacker to cause the BGP process to restart unexpectedly, resulting in a DoS condition. The Cisco implementation of BGP accepts incoming BGP traffic only from explicitly defined peers. To exploit these vulnerabilities, the malicious BGP update message would need to come from a configured, valid BGP peer, or would need to be injected by the attacker into the victim's BGP network on an existing, valid TCP connection to a BGP peer.
INFO
Published Date :
Sept. 23, 2020, 1:15 a.m.
Last Modified :
Oct. 29, 2021, 5:14 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
3.6
Exploitability Score :
3.9
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-2019-16021.
| URL | Resource |
|---|---|
| https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200122-ios-xr-evpn | Vendor 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).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2019-16021 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2019-16021 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 -
Reanalysis by [email protected]
Oct. 29, 2021
Action Type Old Value New Value Removed CWE NIST CWE-400 Added CWE NIST NVD-CWE-noinfo -
Initial Analysis by [email protected]
Oct. 05, 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:U/C:N/I:N/A:H Changed Reference Type https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200122-ios-xr-evpn No Types Assigned https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200122-ios-xr-evpn Vendor Advisory Added CWE NIST CWE-400 Added CPE Configuration AND OR *cpe:2.3:o:cisco:ios_xr:6.6.1:*:*:*:*:*:*:* OR cpe:2.3:h:cisco:asr_9000:-:*:*:*:*:*:x64:* cpe:2.3:h:cisco:asr_9010:-:*:*:*:*:*:x64:* cpe:2.3:h:cisco:asr_9904:-:*:*:*:*:*:x64:* cpe:2.3:h:cisco:asr_9910:-:*:*:*:*:*:x64:* cpe:2.3:h:cisco:asr_9912:-:*:*:*:*:*:x64:* cpe:2.3:h:cisco:asr_9922:-:*:*:*:*:*:x64:* cpe:2.3:h:cisco:ncs_540:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5500:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_6000:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:cisco:ios_xr:6.6.2:*:*:*:*:*:*:* OR cpe:2.3:h:cisco:asr_9000:-:*:*:*:*:*:-:* cpe:2.3:h:cisco:asr_9000:-:*:*:*:*:*:x64:* cpe:2.3:h:cisco:asr_9010:-:*:*:*:*:*:-:* cpe:2.3:h:cisco:asr_9010:-:*:*:*:*:*:x64:* cpe:2.3:h:cisco:asr_9904:-:*:*:*:*:*:-:* cpe:2.3:h:cisco:asr_9904:-:*:*:*:*:*:x64:* cpe:2.3:h:cisco:asr_9910:-:*:*:*:*:*:-:* cpe:2.3:h:cisco:asr_9910:-:*:*:*:*:*:x64:* cpe:2.3:h:cisco:asr_9912:-:*:*:*:*:*:-:* cpe:2.3:h:cisco:asr_9912:-:*:*:*:*:*:x64:* cpe:2.3:h:cisco:asr_9922:-:*:*:*:*:*:-:* cpe:2.3:h:cisco:asr_9922:-:*:*:*:*:*:x64:* cpe:2.3:h:cisco:carrier_routing_system:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ios_xrv_9000:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5001:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5002:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5011:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5500:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_6000:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:cisco:ios_xr:6.6.25:*:*:*:*:*:*:* OR cpe:2.3:h:cisco:ncs_540:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540l:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5500:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_560:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:cisco:ios_xr:7.0.1:*:*:*:*:*:*:* OR cpe:2.3:h:cisco:asr_9000:-:*:*:*:*:*:x64:* cpe:2.3:h:cisco:asr_9010:-:*:*:*:*:*:x64:* cpe:2.3:h:cisco:asr_9904:-:*:*:*:*:*:x64:* cpe:2.3:h:cisco:asr_9910:-:*:*:*:*:*:x64:* cpe:2.3:h:cisco:asr_9912:-:*:*:*:*:*:x64:* cpe:2.3:h:cisco:asr_9922:-:*:*:*:*:*:x64:* cpe:2.3:h:cisco:ios_xrv_9000:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_1001:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_1002:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_1004:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5001:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5002:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5011:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540l:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5500:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_560:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_6000:-:*:*:*:*:*:*:*
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2019-16021 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-2019-16021
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.16 }} 0.02%
score
0.51276
percentile