CVE-2020-3480: Cisco IOS XE Software Zone-Based Firewall Denial of Service Vulnerabilities
First published: Thu Sep 24 2020(Updated: )
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.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS XE | ||
| Cisco 1100 Integrated Services Router | ||
| Cisco 1101 Integrated Services Router | ||
| Cisco 1109 Integrated Services Router | ||
| Cisco 1111x Integrated Services Router | ||
| Cisco 111x Integrated Services Router | ||
| Cisco 1120 Integrated Services Router | ||
| Cisco 1160 Integrated Services Router | ||
| Cisco 4221 Integrated Services Router | ||
| Cisco 4321 Integrated Services Router | ||
| Cisco 4331 Integrated Services Router | ||
| Cisco 4351 Integrated Services Router | ||
| Cisco 4431 Integrated Services Router | ||
| Cisco 4451-x Integrated Services Router | ||
| Cisco 4461 Integrated Services Router | ||
| Cisco Asr 1001-hx | ||
| Cisco Asr 1001-x | ||
| Cisco Asr 1002-hx | ||
| Cisco Asr 1002-x | ||
| Cisco Asr 1004 | ||
| Cisco Asr 1006 | ||
| Cisco Asr 1006-x | ||
| Cisco Asr 1009-x | ||
| Cisco Asr 1013 | ||
| Cisco Cloud Services Router 1000v | ||
| Cisco Integrated Services Virtual Router |
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Reference Links
Frequently Asked Questions
What is the vulnerability ID for the Zone-Based Firewall feature vulnerability?
The vulnerability ID for the Zone-Based Firewall feature vulnerability is CVE-2020-3480.
What are the affected software versions for this vulnerability?
The affected software versions for this vulnerability include Cisco IOS XE Software.
What is the severity of CVE-2020-3480?
CVE-2020-3480 has a severity rating of 8.6 (high).
How can an unauthenticated remote attacker exploit this vulnerability?
An unauthenticated remote attacker can exploit this vulnerability to cause the device to reload or stop forwarding traffic through the firewall.
Where can I find more information about this vulnerability?
You can find more information about this vulnerability on Cisco's security advisory page: [https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-zbfw-94ckG4G](https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-zbfw-94ckG4G)
- collector/nvd-index
- agent/type
- collector/mitre-cve
- source/MITRE
- agent/last-modified-date
- agent/severity
- agent/weakness
- agent/title
- agent/author
- agent/references
- agent/softwarecombine
- agent/tags
- agent/description
- agent/event
- agent/first-publish-date
- vendor/cisco
- canonical/cisco ios xe
- canonical/cisco 1100 integrated services router
- canonical/cisco 1101 integrated services router
- canonical/cisco 1109 integrated services router
- canonical/cisco 1111x integrated services router
- canonical/cisco 111x integrated services router
- canonical/cisco 1120 integrated services router
- canonical/cisco 1160 integrated services router
- canonical/cisco 4221 integrated services router
- canonical/cisco 4321 integrated services router
- canonical/cisco 4331 integrated services router
- canonical/cisco 4351 integrated services router
- canonical/cisco 4431 integrated services router
- canonical/cisco 4451-x integrated services router
- canonical/cisco 4461 integrated services router
- canonical/cisco asr 1001-hx
- canonical/cisco asr 1001-x
- canonical/cisco asr 1002-hx
- canonical/cisco asr 1002-x
- canonical/cisco asr 1004
- canonical/cisco asr 1006
- canonical/cisco asr 1006-x
- canonical/cisco asr 1009-x
- canonical/cisco asr 1013
- canonical/cisco cloud services router 1000v
- canonical/cisco integrated services virtual router