Vulnerability identifier: #VU24517
Vulnerability risk: Medium
CVSSv3.1: 6.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H/E:U/RL:U/RC:C]
CVE-ID:
CWE-ID:
CWE-399
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
Cisco IOS XR
Operating systems & Components /
Operating system
Vendor: Cisco Systems, Inc
Description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to incorrect processing of a Border Gateway Protocol (BGP) update message that contains crafted Ethernet VPN (EVPN) attributes. A remote attacker can send specially crafted Mcast Join in RR/ASBR/Retain Route target message, wait for a user on the device to display the EVPN operational routes’ status and cause the BGP process to restart unexpectedly, resulting in a DoS condition.
Mitigation
This vulnerability has been patched in the following patches only:
Vulnerable software versions
Cisco IOS XR: 6.6.1 - 7.0.1
External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200122-ios-xr-routes
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.