PT-2020-1382 · Cisco · Cisco Ios Xr

Published 2020-01-22 · Updated 2020-01-29 · CVE-2019-16022

Positive Technologies (AI Summary)

CVSS v3.1

8.6

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Cisco IOS XR Software (affected versions not specified)

Description The issue is related to multiple vulnerabilities in the implementation of Border Gateway Protocol (BGP) Ethernet VPN (EVPN) functionality. These vulnerabilities could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition by sending BGP EVPN update messages with malformed attributes. The vulnerabilities are due to incorrect processing of BGP update messages that contain crafted EVPN attributes. A successful exploit could allow the attacker to cause the BGP process to restart unexpectedly, resulting in a DoS condition. The attacker would need to be a configured, valid BGP peer or inject the malicious message into the victim's BGP network on an existing, valid TCP connection to a BGP peer.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

Resource Exhaustion

Weakness Enumeration

CWE-399

CWE-400

Related Identifiers

BDU:2020-00332

CVE-2019-16022

Affected Products

Cisco Ios Xr

References · 6

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200122-ios-xr-evpn · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2019-16022 · Security Note
• https://osv.dev/vulnerability/CVE-2019-16022 · Vendor Advisory
• https://bdu.fstec.ru/vul/2020-00332 · Security Note
• https://cybersecurity-help.cz/vdb/SB2020012413 · Note
• https://t.me/cvenotify/413 · Telegram Post