Vulnerability identifier: #VU24519
Vulnerability risk: High
CVSSv3.1: 7.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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 Border Gateway Protocol (BGP) update messages that contain crafted Ethernet VPN (EVPN) attributes. A remote attacker can send specially crafted Multicast Leave update messages and perform a denial of service attack.
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-evpn
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.