CVE-2020-3479: Cisco IOS and IOS XE Software MP-BGP EVPN Denial of Service Vulnerability
First published: Thu Sep 24 2020(Updated: )
A vulnerability in the implementation of Multiprotocol Border Gateway Protocol (MP-BGP) for the Layer 2 VPN (L2VPN) Ethernet VPN (EVPN) address family in Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to incorrect processing of Border Gateway Protocol (BGP) update messages that contain crafted EVPN attributes. An attacker could exploit this vulnerability by sending BGP update messages with specific, malformed attributes to an affected device. A successful exploit could allow the attacker to cause an affected device to crash, resulting in a DoS condition.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS | ||
| Cisco IOS XE | ||
| Cisco 1100 Series 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 4441 Integrated Services Router | ||
| Cisco ASR 1001-HX | ||
| Cisco ASR 1001-X | ||
| Cisco ASR 1002-HX-RF | ||
| 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 |
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Reference Links
Frequently Asked Questions
What is CVE-2020-3479?
CVE-2020-3479 is a vulnerability in the implementation of Multiprotocol Border Gateway Protocol (MP-BGP) for the Layer 2 VPN (L2VPN) Ethernet VPN (EVPN) address family in Cisco IOS Software and Cisco IOS XE Software.
What is the severity of CVE-2020-3479?
The severity of CVE-2020-3479 is high, with a CVSS score of 7.5.
How does CVE-2020-3479 affect Cisco devices?
CVE-2020-3479 affects Cisco IOS Software and Cisco IOS XE Software.
What is the impact of CVE-2020-3479?
CVE-2020-3479 could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.
How can I fix CVE-2020-3479?
To fix CVE-2020-3479, it is recommended to apply the necessary updates and patches provided by Cisco.
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- vendor/cisco
- canonical/cisco ios
- canonical/cisco ios xe
- canonical/cisco 1100 series 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 4441 integrated services router
- canonical/cisco asr 1001-hx
- canonical/cisco asr 1001-x
- canonical/cisco asr 1002-hx-rf
- 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