CVE-2020-3421
Cisco IOS XE Zone-Based Firewall Layer 4 Packet Processing Denial of Service
Description
Multiple vulnerabilities in the Zone-Based Firewall feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause the device to reload or stop forwarding traffic through the firewall. The vulnerabilities are due to incomplete handling of Layer 4 packets through the device. An attacker could exploit these vulnerabilities by sending a certain sequence of traffic patterns through the device. A successful exploit could allow the attacker to cause the device to reload or stop forwarding traffic through the firewall, resulting in a denial of service. For more information about these vulnerabilities, see the Details section of this advisory.
INFO
Published Date :
Sept. 24, 2020, 6:15 p.m.
Last Modified :
Nov. 7, 2023, 3:22 a.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
4.0
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-2020-3421.
| URL | Resource |
|---|---|
| https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-zbfw-94ckG4G | 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-2020-3421 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2020-3421 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 Removed CVSS V3 Cisco Systems, Inc. AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H Added CVSS V3.1 Cisco Systems, Inc. AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H -
CPE Deprecation Remap by [email protected]
May. 22, 2023
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:h:cisco:isr_4331:-:*:*:*:*:*:*:* OR *cpe:2.3:h:cisco:4331_integrated_services_router:-:*:*:*:*:*:*:* -
CPE Deprecation Remap by [email protected]
May. 22, 2023
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:h:cisco:isr_4321:-:*:*:*:*:*:*:* OR *cpe:2.3:h:cisco:4321_integrated_services_router:-:*:*:*:*:*:*:* -
CPE Deprecation Remap by [email protected]
May. 22, 2023
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:h:cisco:isr_4351:-:*:*:*:*:*:*:* OR *cpe:2.3:h:cisco:4351_integrated_services_router:-:*:*:*:*:*:*:* -
CPE Deprecation Remap by [email protected]
May. 22, 2023
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:h:cisco:isr_4431:-:*:*:*:*:*:*:* OR *cpe:2.3:h:cisco:4431_integrated_services_router:-:*:*:*:*:*:*:* -
CPE Deprecation Remap by [email protected]
May. 22, 2023
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:h:cisco:isr_4461:-:*:*:*:*:*:*:* OR *cpe:2.3:h:cisco:4461_integrated_services_router:-:*:*:*:*:*:*:* -
CPE Deprecation Remap by [email protected]
May. 22, 2023
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:h:cisco:isr_1100:-:*:*:*:*:*:*:* OR *cpe:2.3:h:cisco:1100_integrated_services_router:-:*:*:*:*:*:*:* -
CPE Deprecation Remap by [email protected]
May. 22, 2023
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:h:cisco:isr_1109:-:*:*:*:*:*:*:* OR *cpe:2.3:h:cisco:1109_integrated_services_router:-:*:*:*:*:*:*:* -
CPE Deprecation Remap by [email protected]
May. 22, 2023
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:h:cisco:isr_111x:-:*:*:*:*:*:*:* OR *cpe:2.3:h:cisco:111x_integrated_services_router:-:*:*:*:*:*:*:* -
CPE Deprecation Remap by [email protected]
May. 22, 2023
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:h:cisco:isr_1111x:-:*:*:*:*:*:*:* OR *cpe:2.3:h:cisco:1111x_integrated_services_router:-:*:*:*:*:*:*:* -
CPE Deprecation Remap by [email protected]
May. 22, 2023
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:h:cisco:isr_1120:-:*:*:*:*:*:*:* OR *cpe:2.3:h:cisco:1120_integrated_services_router:-:*:*:*:*:*:*:* -
CPE Deprecation Remap by [email protected]
May. 22, 2023
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:h:cisco:isr_1160:-:*:*:*:*:*:*:* OR *cpe:2.3:h:cisco:1160_integrated_services_router:-:*:*:*:*:*:*:* -
CPE Deprecation Remap by [email protected]
May. 22, 2023
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:h:cisco:isr_1101:-:*:*:*:*:*:*:* OR *cpe:2.3:h:cisco:1101_integrated_services_router:-:*:*:*:*:*:*:* -
CPE Deprecation Remap by [email protected]
May. 22, 2023
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:h:cisco:isr_4221:-:*:*:*:*:*:*:* OR *cpe:2.3:h:cisco:4221_integrated_services_router:-:*:*:*:*:*:*:* -
Initial Analysis by [email protected]
Oct. 09, 2020
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:N/I:N/A:C) 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-zbfw-94ckG4G No Types Assigned https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-zbfw-94ckG4G Vendor Advisory Added CWE NIST CWE-754 Added CPE Configuration AND OR *cpe:2.3:o:cisco:ios_xe:16.9.3:*:*:*:*:*:*:* OR cpe:2.3:h:cisco:asr_1001-hx:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_1001-x:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_1002-hx:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_1002-x:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_1004:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_1006:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_1006-x:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_1009-x:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_1013:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:isr_4221:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:isr_4321:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:isr_4331:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:isr_4351:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:isr_4431:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:isr_4461:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:cisco:ios_xe:17.2:*:*:*:*:*:*:* OR cpe:2.3:h:cisco:asr_1001-hx:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_1001-x:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_1002-hx:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_1002-x:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_1004:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_1006:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_1006-x:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_1009-x:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_1013:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:csr_1000v:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:isr_1100:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:isr_1101:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:isr_1109:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:isr_1111x:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:isr_111x:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:isr_1120:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:isr_1160:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:isr_4221:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:isr_4331:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:isr_4431:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:isr_4461:-:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Sep. 24, 2020
Action Type Old Value New Value Changed Description Multiple vulnerabilities in the Zone-Based Firewall feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause the device to reload or stop forwarding traffic through the firewall. The vulnerabilities are due to incomplete handling of Layer 4 packets through the device. An attacker could exploit these vulnerabilities by sending a certain sequence of traffic patterns through the device. A successful exploit could allow the attacker to cause the device to reload or stop forwarding traffic through the firewall, resulting in a denial of service. For more information about these vulnerabilities, see the Details section of this advisory. Multiple vulnerabilities in the Zone-Based Firewall feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause the device to reload or stop forwarding traffic through the firewall. The vulnerabilities are due to incomplete handling of Layer 4 packets through the device. An attacker could exploit these vulnerabilities by sending a certain sequence of traffic patterns through the device. A successful exploit could allow the attacker to cause the device to reload or stop forwarding traffic through the firewall, resulting in a denial of service. For more information about these vulnerabilities, see the Details section of this advisory.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2020-3421 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-2020-3421
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
0.51298
percentile